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Glass

Glass has been described as "the greatest building material known to man" and it is a building material with outstanding durability, which plays a crucial part in creating the visual appearance of all buildings.

Understanding glass and its relationship to light, transparency, reflection, insulation, solar gain, sound control, strength, safety and what these qualities can bring to a building to impact on indoor and outdoor environments is critical when designing with glass.

Whilst all float glass is imported into New Zealand, local processing is available for some products, so for specific design projects there is the opportunity to get exactly the glass performance you need for your building glazing solution without compromise, from a range of local and international manufacturers and processors.

Clear Float (annealed)

The Float glass process is the most common process of glass production. The process involves the melting of the raw ingredients (silica, lime and soda) in a furnace and floating it on a large bed of molten tin. The mixture slowly solidifies over the tin as it enters the annealing oven where it is slowly control cooled. The glass exits the oven as one large sheet after which it is cut to meet the customer's needs. The speed at which the glass is drawn over the tin bath controls the thickness which ranges from 2 to 19mm.

As suggested by the name, clear float glass has a high level of transparency and offers a high amount of visible light transmittance.

Clear float glass can be further processed in order to emphasize certain characteristics. Examples are heat strengthened, toughened, laminated and insulating glass units.

 

Low Iron (extra clear)

The main ingredient of glass is silica which has naturally occurring iron oxides. It is these oxides that cause the greenish tint you can see in most butt jointed structurally glazed windows such as total vision systems, shop fronts, showers, glass cabinets etc.  

Low iron glass is made from a high-quality silica which has approximately 75% less iron content than standard float glass, allowing for a clearer glass with much higher light transmission. All other finishing processes are the same as standard float glass. 

Low Iron glass is perfect for areas which require excellent clarity like shop fronts, display cases, aquariums and in decorative situations. Due to its clarity, low iron glass has poor solar control.

 

Tinted

Tinted glass is manufactured by the same process as clear float glass; however, manufacturers can introduce oxides to tint the glass in a range of shades These are typically green, blue, grey and bronze. The process reduces UV radiation, visible light transmission and solar gain.

When a glass has a tint, it can get hot and create thermal stress. Depending on the colour and darkness of the tint, the glass may require heat treatment in order to protect it from heat induced damage. Tinted glass can provide significant benefits when used in IGUs and in conjunction with a Low E coated glass.

Benefits:

  • Solar control, reducing the need for air conditioning.
  • Range of colours available, allowing for originality in architectural design.
  • Subtle colour range.
  • Low reflection, reducing glare from the sun.
  • Improved privacy compared with clear float glass.
  • Can be further processed in the same ways as traditional annealed glass.
  • Can reduce UV radiation.

 

Coated

Float glass can be coated on the float line with pyrolytic coatings (hard coating) or off line with sputtered coatings (soft coatings) and the coatings are transparent and can be reflective for solar control and/or low E for insulation.

 

Reflective

Reflective glass is designed to reflect solar heat and light and reduce glare and solar gain in a building – There is a wide range of reflective glass types and colours and properties vary widely.

Pyrolytic reflective glass has a metal oxide coating that is applied on line during the float manufacturing process. The coating is very hard and durable and so can be glazed to either the external (surface 1) or internal surfaces (surface 2). It has the further advantage that it can be processed and cut like standard float glass. The other names for this process are ‘on line’ and ‘hard coat’ reflective glass.

Sputtered coat reflective glass has metal particles deposited onto the surface of the glass in a vacuum chamber. In general, sputtered coat surfaces have better solar control than pyrolytic glass. Sputtered coats are often called ‘soft coats’ because they are more susceptible to damage and so special care must be taken during processing and glazing. These are often toughened or heat-treated, increasing the lead time and costs when compared to pyrolytic coatings.

 

Low E

Low emissivity glass (Low E) is a special coating that is designed to increase the thermal performance of windows and reduce heat transfer. It is manufactured by either pyrolytic or sputter techniques.

Low E coatings are designed to reflect long wave radiation from the inside or outside of the building.  They are generally non-reflective and highly transparent.

The coating will help to prevent heat escaping the building during winter, and at the same time allowing free passive heating from the sun to warm the building, contributing to an increased energy efficiency of the windows.

The pyrolytic coatings can be used in single glazing, but must be applied to surface 2 to ensure it functions properly. The coatings are perfect to use in IGUs and in conjunction with a tinted coating in order to control the solar gain.

Benefits:

  • Improve thermal efficiency of windows
  • Improved thermal insulation
  • Promotes passive solar heat gain
  • Improved solar control performance when used in conjunction with tinted coatings.

 

Toughened Safety Glass (TSG)

 

Also known as tempered glass, TSG is a Grade A Safety Glass that is easily identifiable in its broken state. This is from its characteristic small dice sized particles of glass which significantly reduce the risk of severe injury and deep lacerations.

The toughening process involves heating of the glass to a very high temperature and then rapidly cooling by blasting air on the surface. This creates high compression stresses in the glass surface which are balanced by tensile stresses in the centre. The compressive stresses press any surface flaws closed preventing crack migration and glass failure.

The toughened glass surface is not as hard as annealed glass, and so manufacturers often apply coatings and/or laminates to the surface of the glass.

Toughened glass must have all its finishing work (e.g. holes, chamfers and polishing) undertaken prior to the process of toughening being undertaken.

 

Heat Soaked Toughened Safety Glass (QTSG)

Heat Soaking is an additional destructive testing process that follows the toughening process and is aimed at detecting impurities in the glass like Nickle Sulphide Inclusions. These impurities are often invisible to the naked eye but can cause spontaneous breakage of the glass.

The Heat Soak process heats the glass slowly up to just below its softening point and then slowly cools it again. The process expands the nickel sulphide stones. If the glass has an inclusion or other fault in it, the substantial tension induced in the surface will usually cause spontaneous breakage.

The process is a safe guard to ensure that any toughened glass being used as a life safety barrier or installed overhead does not fail in service. The process still does not offer a one hundred percent defect free certification.

 

Heat Strengthened (HS)

 

Similar to the toughening process, but the glass is heated to slightly lower temperatures and has a lower cooling quench resulting in lower levels of surface compression. It does not fracture in the same fashion as toughened glass, and is not a safety glass, but it will generally break from side to side and the glass will remain in the frame after breakage.

Due to the heat strengthening process this glass is still very stable under thermal stress and is most commonly used in tinted, coated, and reflective glass where it may be partially exposed to large temperature differentials in façades vision or spandrel panels which are susceptible to large internal heat gains. There is a significantly reduced risk of spontaneous failures due to NiS.

Heat strengthened glass is often used in laminated glass, as it is generally flatter with less optical distortions than toughened glass. Because of this it is often used in curtainwall facades for both vision and spandrel glass.

 

Ceramic Frit

Ceramic Enamel glass is often known as "fritted" glass as it uses crushed glass frit mixed with special enamel paint and colour oxides that are fired onto the glass surfaces during heat treatment process. The ceramic enamel is applied by rolling, spraying, screen printing or digital printing and is very durable and stable in colour.

The pattern or design can be solely for aesthetic purposes or can aid in privacy screening, providing solar shading or reducing glare.

Direct on glass digital printing allows for virtually any image in multiple colour, to be printed on glass for interior and external glass applications.

 

Laminated Safety Glass (LSG)

LSG is a Grade A Safety Glass. It provides increased safety because it holds together if broken, reducing the likelihood of serious injury, whether in a vertical or overhead position. It can also offer increased security as the glass will generally remain in the frame after fracture. Laminated glass consists of two or more layers of glass, factory bonded together with a plastic interlayer. Laminated glass is available in a range of interlayers, the most common being:

  • Polyvinyl Butyral (PVB) – This is the most common form of interlayer and is available in 0.38, 0.76, 1.1, and 1.52 mm thickness, but can be layered thicker.
  • Cast in place (CIP) resin – There are two types of resin interlayer used, Safety and Acoustic (which provides better sound control). The resins are UV cured between glass layers which are separated by a clear edge tap.
  • Ethylene Vinyl Acetate (EVA) – This is a newer interlayer which is available in 0.4, 0.8, 1.2, 1.6 mm thickness and can be layered thicker. It is ideal for laminating a range of special products including inserts in the laminate like photovoltaics.
  • SentryGlas Plus (SGP) – This is a special high strength interlayer for barriers and structural glazing applications, which is more rigid than other interlayers.

Laminated glass can also assist in a reduction in noise transfer through the glass and lowered UV transmission. Laminated glass can be incorporated with other glass types in an IGU to provide a further increase in thermal performance.

Laminated glass has size limitations depending on the process but Woods Glass has access to some of the largest lamination manufacturing sizes available.

PVB is available in various tints and colours including translucent, and EVA can be laminated with coloured PET inserts and or translucent interlayer.

Laminated glass can incorporate layers of toughened glass (TLSG) and Heat Strengthened glass (HSLSG) for additional strength and safety.

 

Insulating Glass Unit (IGU)

An IGU has two or more panes of glass with a factory sealed air (or gas) gap between, and is often known as Double Glazing (DG).

A single pane of glass has very poor thermal resistance. The addition of an airgap increases the insulation value significantly by eliminating heat transfer since air is a very good insulator. An IGU works to insulate in both winter and summer conditions and reduce the cost of heating and cooling in buildings. The measurement of thermal performance is known as the U-Value, and this can range from 3 down to 1 W/m2K depending on the air space and glass type.

Common gases used in the sealed gap are air, argon and krypton. Air is the most common as it is cheaper and more widely available. Argon and krypton have better insulating properties than air.

The glass layers can include performance low E glass, which reduces the U value and increases thermal performance.

IGUs provide many advantages to a building's envelope: reduced heat loss, heat gain, condensation, reduced noise and potentially reduced mechanical plant - and above all, increased occupant comfort.

 

Cast U-Profile (LINIT)

Cast or profiled glass is one of the oldest methods of glass production. While the glass is still hot and in a plastic state, it is rolled and bent into 'U' shape profiles of various widths up to 7m long. It is then cooled, annealed and cut to length. The resulting glass channels all have an individual optical character which gives the effect of a lively, light refracting glass façade. The U-profile channels can have multiple surface finishes, including cord and prismasolar patterns, sandblasted or ceramic frit (coloured). LINIT U-Glass can also be made in low iron glass and can be toughened and heat soaked.

Originally, channel glass was a low-cost solution for simple commercial and industrial buildings. However, it has become a fashionable building element that is now specified by leading architects for museums, hospitals, shopping centres and sport stadiums etc.

There are many methods of installing these glass elements, including a unique glazing channel system. At Woods Glass, we will help specify the appropriate product based on your design.

Woods Glass source this glass from 'Lamberts' one of the oldest independent glass manufacturing facilities in Germany, established in 1887. Woods Glass represent the LINIT glass (profiled cast glass) products in New Zealand and are available for providing design and engineering assistance for this specialist glass and the integration of it into your project.

Product Features

  • Made in Germany.
  • Available up to 7m long.
  • Range of profiles available from 232 x 41 -331 x 60mm
  • Can be toughened (tempered) and heat soaked
  • Range of surfaces finishes and patterns
  • Range of colours using ceramic enamel
  • Range of glazing methods for single or double glazing
  • Sustainably produced using oxygen fired melting furnace.
  • Utilises the maximum amount of recycled glass possible.
  • Labelled as one of the 'Top 10 Green Building Products 2008' and was the only glass product in the list.
  • High quality product.
  • Range of frames available including thermally broken

From the Download section you can download the LINIT Design Manual or click here.

 

Bends & Curves

Glass can be bent and curved in a simple radius or compound curves. It can also be toughened and laminated for safety, and made into an IGU for insulation. Limits apply to all processes depending on the equipment used.

Woods Glass can source bends and curves from local and international manufacturers depending on the specifications.

The key terms and data required are:

Height:

The straight edge length of the bend

Girth:

The distance around the circumference of the curve

Depth:

The distance between the apex of a bend and a line across the edge

Radius:

A line taken from the centre of a circle to the circumference

Degree: 

The size of the segment of a circle in degrees

Tangent:

A straight line coming from the arch of a curve

Chord: 

The straight distance between the edges of the curve

When ordering curved glass, try and provide all the measurements listed above if possible. It is important that the measurements state whether they are to the inside or outside surface of the glass.

 

Fire Rated

It is important to understand that glass is not fire rated, rather it is used in conjunction with a frame system to achieve a Fire Resistant Rating (FRR). The frame can be timber, mild steel, stainless steel or even special aluminium profiles.

The FRR has 3 classifications from NZS 4232 Part 2:

Structural adequacy: the ability for the system to maintain adequate stability and load bearing capacity

Integrity: The ability of the system to resist flames and hot gases from passing through

Insulation: the ability for the surface not exposed to fire to remain below limits specified

FRR is defined in minutes of fire as follows FRR = 30/60/30. This is always in the order of structural adequacy/ Integrity/ Insulation.

Typically, glass is only defined by Integrity and Insulation, for example - /60/30.

Fire Rated glass products vary from traditional wired glass to special ceramics, intumescent laminates, and IGUs and up to -/120/120 performance

Woods Glass and Thermosash Commercial can assist with the supply of Fire Rated systems

 

Anti-Reflection (AR)

Normal glass surfaces have an external reflection of 8% and these can impede the view, especially in high angles of incidence (viewing on an angle). To assist the clarity of the view, AR glass has a special surface coating which reduces the reflection down to 1% or less. With this coating applied, a miracle happens as the glass seems to disappear.

AR glass is ideal for display cases, special shopfronts and viewing windows. The coating can be applied to one or two surfaces and AR glass can be laminated, toughened and used in an IGU. AR coating can also be applied to low iron glass for even higher clarity.

 

Self-Cleaning

Self-cleaning glass is float glass with a special pyrolytic coating which works in two stages. In the first stage, the coating reacts with UV rays from the sun to generate a photocatalytic process. This causes the dirt particles on the surface of the glass to break down. Secondly, when rain lands on the glass, the water is attracted to the surface by the hydrophilic (water attracting) properties, causing it to sheet evenly across the glass, washing away loose dirt and drying without spotting.

Naturally, the glass must have full sun and rain exposure, and not be shaded by structure or the like. It’s ideal for hard to clean surfaces such as rooflights and canopies. The coating does not like salt water deposits and so it is not as effective near the sea.

 

Translucent

 

Translucent glass can be created with a variety of techniques as follows

  • Sand blasted – Using high pressure air and sand to blast the glass surface. This creates a frosted surface which is permanent. Sandblasting must be completed prior to glazing. It can also reduce the strength of the glass by up to 60%. Thus, consideration must be taken when using in human impact or high windload areas.
  • Acid etched – Using acid baths to etch the surface white. The treatment leaves a surface which softens and contours the light. It can be processed in many of the same ways as annealed glass and so can be used in many different glazing applications.
  • Translucent interlayer – using PVB or EVA translucent interlayers in varying density. These are becoming more popular since they have a more consistent colour, and are easier to clean than sandblasted or etched glass. The interlayer still has excellent light transmission, while also dispersing the light evenly, leading to a soft glow through the glass.
  • Translucent ceramic frit – Ceramic frit paint is screen printed onto glass which is the heat treated to fuse it to the surface. An inclusion of a percentage of white allows for a more opaque (frosted) effect.
  • Translucent inserts - Using special material inserts and films in EVA laminated glass
Translucent glass can be combined with colour for special effects. Translucent glass is popular for use in areas like bathrooms where privacy is required, but light transmittance is still important.

 

Patterned

Patterned and obscured glass is manufactured in many different thicknesses and patterns. The pattern is rolled into the surface during manufacture. Many patterned designs used for older houses are no longer available. Typically, they are 4, 5 and 6 mm in thickness but some special commercial patterns are available in 8 and 10mm. In addition, some are available in grey and bronze tints.

Typical patterns are:

  • Stippolite / Spotswood
  • Cathedral
  • Roughcast
  • Mistlite / Satinlite / Pacific
  • Cotswold / Seadrift
  • Narrow Reeded
  • Broad Reeded
  • Flemish
Some patterns can be toughened and or laminated for safety glass but some deep patterns cannot. Most can be used in IGUs but the pattern side may need to be on the outer surfaces (1 or 4).

 

Decorative

Decorative glass is often associated with special antique or coloured glasses used for lead lights and copper lights but can also be patterned. In addition, decoration may be achieved by a range of processes:

  • Antique
  • Coloured
  • Stained
  • Acid etched
  • Sand blasted
  • V cut glass
  • Mirrored glass
  • Painted glass
  • Filmed

 

Mirror

Traditional mirrors use silver to create mirrored glass that is protected by copper. Modern techniques have more stringent quality controls that require copper-free designs in order to avoid corrosion. Any glass thickness or tint can be mirrored but it is most common in clear 3, 4, 5 and 6mm. Safety “vinyl back” mirrors are also available for extra safety applications, and heated pads can be fitted. Safety mirrors will usually show some distortion in the reflected images due to the manufacturing process.

Typical products are:

  • Clear silver mirror
  • Tinted mirror
  • Antique mirror
  • Safety back mirror
  • Heated mirror (mist free)
  • Venetian mirror (stripes)
  • Mirror tiles (plain or bevelled)
  • One-way mirror (see applicable section as this is not mirror glass)

 

Back Painted

 

 Modern paints using adhesion additives have allowed a wide range of standard paint colours to be applied to glass. Typically they are called and used as “splashbacks” but have a wide range of uses, normally internal.

  • Splashbacks for Kitchens and Bathrooms
  • Bath and shower lining
  • Cupboard doors
  • Vanity tops
  • Bar and counter tops
  • Furniture
  • Wall cladding
  • Partitions and screens
  • Signage boards

In most cases they are toughened for safety and to comply with gas appliance standards and the paint is normally applied to low iron glass to achieve exact colour matching.

Size limits apply according to the manufacturer and care is required with the glazing and sealing methods.

 

Glass Blocks

Glass Blocks are manufactured by casting two shells and forming them to together to seal the airspace. They provide good thermal and sound insulation and in combination with colour and surface patterns they can create spectacular lighting effects. The blocks come in various styles with different patterns and shapes.

Typical sizes are as follows

  • 190 x 190 x 80
  • 240 x 240 x 90
  • 146 x 146 x 80
  • 240 x 115 x 80
  • Special 45-degree corner blocks

Glass blocks can be fire rated up to 1 hour in a steel frame and glazed into special aluminium frames with grout and/or silicone.

 

Security

Laminated glass can be made to resist severe purposeful or accidental impact and is often constructed from combinations of multiple layers of glass and thick interlayers.  

Typical types are

  • Anti- Bandit for smash and grab - typically 7.5 and 11.5mm. This glass is made up of two sheets of annealed glass bonded by a 1.5 mm thick plastic interlayer. This is designed to resist manual attack and to delay the access to the protected area for a short period of time. This glass is ideal for instances where the noise generated would alert neighbours and inhabitants.
  • Intruder Resistant for higher security - typically 14 to 23 mm. These glasses are generally multi-laminates and glass and polycarbonate construction. Because there are multiple layers of material, it makes penetration very difficult and time consuming.
  • Prison and Suicide cell for security and safety – typically 14 to 20 mm. The construction of this product is by using multiple layers of annealed, toughened and heat strengthened glass and polycarbonate with an interlayer. The result is a thin, lightweight product that is ideal for low or medium security applications, like the housing of mentally disturbed patients. The glass will maintain a level of strength even after one or both of the plies have been broken.

Various combinations are available depending on the level of resistance or attack weapon and international standard performance. The frame design is critical in order to equally resist the force imposed.

 

Cyclone Resistant (CR)

Laminated glass can be made to resist extreme wind and airborne flying debris that occurs during a cyclone. In such situations the glass must withstand penetration from a 4kg, 100 x 50 mm timber plank travelling at 15 m/s or more. To do this the interlayer must be strong and thick (typically 14mm). The glass is usually made up of two 5 mm thick glass sheets bonded together with a 3.8 mm PVB interlayer. Sometimes the glass is even thicker as the wind pressures are very high in cyclone conditions.

 

Bullet Resistant (BR)

Bullet Resistant glass is multi laminated glass and in some cases uses layers of either PVB or CIP inside. It ranges from 20 to 75mm depending on the weapon such as

  • 9mm handgun
  • 357 magnum
  • 44 magnum
  • AK 47 and 5.56 rifle
  • 62 NATO rifle

 Various combinations are available depending on the level of resistance or attack weapon and international standard performance. The frame design is critical in order to equally resist the force imposed

 

One Way Vision

One-way vision is an effect created with low light transmission reflective glass. In order to achieve the desired effect, the observation side must be far less brightly lit than the subject side. A ratio of 8:1 is ideal. The light must also not shine directly on the glass. This glass is ideal where discreet observation and surveillance is required.

 

Photovoltaic

BIPV or Building Integrated Photovoltaics, are a specialty glass element. They are available in either transparent or translucent glass with integrated solar cells to convert clean electric solar energy into electricity. This means that power for a building could be produced within the roof, canopy, sky light or from the glazed vertical façade elements. The glass types can come in laminated and high performance specifications including IGUs as required, offering thermal insulation properties as well varying transparency levels, providing a shading element and reduction in solar gain.

The solar cells are embedded between two glass panes and a special resin is filled between the panes, securely wrapping the solar cells on all sides. Each individual cell has two electrical connections, which are linked to other cells in the module, to form a system which generates a direct electrical current.    

There are a number of international projects around the world incorporating this technology setting a precedent for zero carbon power generation. 

Woods Glass are constantly reviewing offshore technologies and are seeing that the efficiencies and cost of this technology is becoming increasingly more feasible. We have technology agreements with many specialty glass suppliers and can assist your project's integration of BIPV products.  If you need assistance with a 'total' off-grid integrated glass solution - please contact us to discuss your needs.

 

Switchable

Switchable Glass is a laminated glass with a liquid crystal inter-layer that carries an electrical charge. When current runs through the glass inter-layer the crystals align which makes the glass transparent.  However, when the power is turned off, the crystals randomly overlap causing an opaque privacy glass.  

Switchable glass is great for when a clear or tinted appearance glass pane is required, then with the flick of a switch the glass pane goes from transparent to opaque, offering privacy. 
Uses include projector screen walls, meeting rooms, bathroom divider walls etc.

Woods Glass has a relationship with the provider of this technology. They have a long history in the industry (since 1990) and one of the highest clarity systems in switchable privacy glass technology.

Sizes are limited to 3500 x 1820mm and glass can be clear or tinted annealed, heat strengthened or toughened. It can also be made into an IGU, and in special cases, shaped, curved and made with cut outs.

New technology allows blinds (lines) or logos to be switched on and off in the glass for special effects.

For more information see www.polytron-global.com 

 

Heated

Heated glass is a coated glass with an electrically conductive coating in which the electrical resistance produces heat energy and warms the glass. The coating is protected inside laminated glass or an IGU.

Heated glass is best suited for applications requiring passive condensation control, thermal performance, and high visibility, such as commercial refrigeration, and marine window applications.   

Large sizes up to 5180 x 2500 mm can be made. The glass is also toughened due to the operating temperature.

 

Self-Tinting

VariShield self-tinting glass is a unique thermochromic laminated safety glass with a special interlayer that tints darker when exposed to the sun (heated). It has no wires, electrodes, power supplies or controls and no tricks – just the sun.

It allows approximately 50% of the visible light transmission (VLT) under normal cloudy conditions to transmit internally and as the sun beats down on the glass it drops to around 10% VLT so you don’t need blinds, drapes and shades, and don’t need to worry about glare. It also reduces UV and sound so it provides a better working environment, and is best suited for east, north and west sunny faces of the building.

VariShield is combined with low e glass and used in IGUs to provide brilliant performance and lower the shading coefficient (SC) down to as low as 0.14 with a U value of 1.3 W/m2K

 It is limited in size to 2700 x 1650mm

 

Electrochromic

Electrochromic glass is very sophisticated and is often known as “Dynamic Glass”. It has a special coating with 5 layers of ceramic material so when you apply a low voltage the electricity darkens the glass by electron transfer. Reversing the voltage causes the ions and electrons to return to their original clear state.

The result is a glass that absorbs and re-radiates away the sun’s unwanted heat and glare at the flick of a switch so you can maximise daylight and solar energy.

The coatings are only used in IGU combinations to provide optimum performance, and size limitations apply.  


 

Data Shielding

Electronic eavesdropping can be used to gain valuable and confidential data. This can pose serious and costly problems for businesses in today’s IT driven world. Data shielding glass reduces the transmission of radio frequencies (RF) and is sometimes known as RF shielding. In order to protect a building, a Faradays cage principle must be applied. This means all external surfaces need to be electrically conductive and then grounded. Since windows are an important part of the external façade, these must also be electrically conductive.

The result is that any radio frequency that is emitted from equipment rebounds back and stays within the walls of the building. It also prevents external electronic interference from entering the building.

The glass is often used in high security IT installations, television and radio stations, and security and computer installations.  

 

X-Ray

X-Ray glass is often known as “Radiation Shielding” glass, or “Lead Glass” as it contains lead to screen out X-Ray radiation used in CT scanning rooms and the like. The high barium and lead content make the glass very heavy and it is rated according to the lead equivalent required for protection. The glass has excellent light transmitting capabilities.

The minimum lead equivalent options are normally 1.1, 1.5, 1.8, 2, 2.2, 2.5 and 3mm and the glass ranges from 6mm to 12mm. The glass is limited in size and is very heavy due to the lead.

 

Films & Coatings

Glass can have a wide range of films and coatings applied after manufacture in addition to the special glass coatings applied during manufacture

Typical Films and coatings  

  • Clear safety film
  • Clear security film
  • Solar tinted or reflective films
  • Low e film
  • Anti-graffiti film
  • Decorative films
  • Safety mirror film or coatings
  • UV elimination coatings
  • Easy clean coating
  • Low e coatings  

Most have limited warranty and durability but in some situations they are suitable.

 

Do you have a technical question?

We've compiled an intuitive inquiry section which will help you get the knowledge you need.

 

Technical Inquiry >

Auckland Office
+64 (0)9 525 3379
Fax: +64 (0)9 525 8200
enquiry.akl@woodsglass.co.nz

Wellington Office and Factory
Phone: +64 (0)4 913 1999
Fax: +64 (0)4 939 4499
enquiry.wgtn@woodsglass.co.nz

Christchurch Office and Factory
Phone: +64 (0)3 366 3733
Fax: +64 (0)3 365 6422
enquiry.chch@woodsglass.co.nz

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