Catalogue & Reference Guide | 6th Edition QUICK REFERENCE   Symbols | Navigation | Performance data  
GLASS PROCESSING SELECTION PERFORMANCE DESIGN GLAZING COMPLIANCE REFERENCE

4.2           SafeLite PVBCan Be Laminated

SAFELITE® PVB Laminate is a safety glass made by a heat and pressure process that laminates two or more sheets of glass with a Polyvinyl Butyral (PVB) interlayer between them. The standard and minimum interlayer is 0.38mm thick, but it is also available in 0.76, 1.14 or 1.52mm.

All interlayer thicknesses pass the Grade A safety glass test and 1.52mm is also used for Anti Bandit Glass. Toughened laminates use a 0.76, 1.14 or 1.52mm interlayer, and multiple interlayers can be used in special applications like Cyclone Glass which has 3.8mm of interlayer. Tinted and clear interlayer can be combined with special coloured interlayer. Translucent interlayer is available in two shades, Opalucent and Soft White.

SAFELITE® PVB Laminate Stocklines

Available in:
Clear, Grey, Green, Bronze and Blue.
Opalucent and Soft White.
Clear Low E, Sunergy, Comfort Plus.
Refer Section 18 for stocked thicknesses and sheet sizes.

Maximum Size
The normal maximum size for Safelite PVB laminated glass is 3660 x 2440mm, however larger sizes up to 5100 x 3120mm may be available on request.

 

4.3           SafeLite CIP Can Be CIP Laminated

SAFELITE® CIP is a Grade A Laminated safety glass manufactured by Metro GlassTech to the requirements of AS/NZS 2208 and carrying Bureau Veritas certification. It is a “Cast in Place” laminate made by spacing two sheets of glass with a clear edge tape and then pouring a special liquid resin into the cavity between them. The resin is cured in the factory by UV light to a hard plastic state, bonding the glass sheets together to produce a Grade A safety glass.
SAFELITE® CIP laminate is available with two resin types:

  • Resin S – for strength and safety applications.
  • Resin A – for acoustic and safety applications.

The standard thicknesses of resin interlayer is 1.0mm,
with 1.5mm and 1.8mm available. Most glass types can
be laminated depending on the UV transmission of the
glass combination.

SOUNDSTOP® Acoustic Laminated Glass

Acoustic laminated glass is specifically designed to reduce sound intrusion into buildings. SOUNDSTOP® is an acoustic grade CIP laminated safety glass consisting of two sheets of glass with a 1.0mm or 1.5mm acoustic resin interlayer.
This product has excellent sound reduction properties
due to the elastic nature of the special resin interlayer.
Refer Section 11.4 for more information on acoustics.

Opalite CIP

Opalite is available in a shade range from white to translucent by altering the white resin mixture.
Standard Translucent levels are:
Opalite White (2% white).
Opalite White Translucent (1% white).
Opalite Translucent (0.75% white).
Opalite Light Translucent (0.5% white).

Safelite UV

All PVB laminates have very good resistance to fading from UV light and in most situations they are recommended. However, in some situations where the lamination of specialty glass is required with UV protection a special resin is required with anti-fade additives. These situations require special polyester anti-fade resin which provides excellent UV elimination of 100% in the 300-380 nanometre wavelength range. For standard glazing situations PVB laminate is a more economic option with 99% UV elimination in the same wavelength range.
Refer Section 11.3 for more information on UV elimination and fading.

Glass Bends and Curves

Glass bends can be laminated by the CIP process and enquiries should be submitted to Metro GlassTech.
Refer Section 8.1 for glass bends and curves.

Multi-Laminates

SAFELITE® CIP multi-laminates can be manufactured to any specification with clear float glass. For other glass types enquiries must be submitted. The minimum thickness for glass sheets is 3mm and the maximum glass size is dictated by the 250kg maximum weight restriction. The minimum interlayer thickness is 1.5mm. Edge tape deletion is not an option.

Edge Tape Deletion

The use of clear edge tape as standard makes edge tape deletion unnecessary in most situations. However, the edge tape is 6mm wide and is visible in some situations, especially with clear glass. Edge tape deletion is possible, but is not offered as a service.
Note. Butt jointing Safelite CIP laminated glass in a faceted or picture view window is not recommended.

Size Restrictions

The normal maximum size is 3500 x 2400mm and/or a maximum weight of 250kg. The normal minimum size is 400 x 300mm. Size restrictions are shown in the following table:

Size Restrictions Safelite CIP

For heavy weight laminates with 8mm and thicker glass the weight will normally limit the size. To check the approximate weight use the following formula:
Weight kg = 2.6 x total glass thickness (mm) x area (m2)
Example for a 3000 x 1000mm 10/12 thick laminate
2.6 x (10 + 12) x 3m2 = 171.6 kg.

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Symbols

Performance Data Symbols

For more detailed information click on Performance Data or go to Performance.

Visible Light Transmission
Visible Light Transmisson
Visible Light Reflectance
Visible Light Reflectance
Ultra-Violet Elimination
Ultra-Violet Elimination
Fading Reduction Coefficient
Fading Reduction Coefficient
Shading Coefficient
Shading Coefficient
Solar Heat Gain Coefficient
Solar Heat Gain Coefficient
R Value
R Value
U Value
U Value
Sound Transmission Loss
Sound Transmission Loss
Sound Transmission Class
Sound Transmission Class
Weighted Sound Reduction
Weighted Sound Reduction
Coolness Factor
Coolness Factor
Perceived Sound Reduction
Perceived Sound Reduction
Window Efficiency Rating System
Window Efficiency Rating System
   

 

Quick Reference Symbols

Look for these symbols when choosing your glass to help make your decision easier. If you are looking for particular properties in your glass selection make note of the associated icons below. Each glass type has a list of the applicable icons below it's description.

These icons should be used as a general guideline for your selection. You'll also find icons related to special manufacturing parameters including CIP Laminate, Screen Printing and Toughening.

Available Thickness
Available Thickness
Reflective Coating
Reflective Coating
Low E Coated
Low E Coated
Laminated Glass
Laminated Glass
Good Glare Control
Good Glare Control (rated VLT 70% or lower)
Good Fading Reduction
Good Fading Reduction (rated - FRC 0.5 or lower)
Good Solar Control
Good Solar Control (rated S/C 0.6
or lower)
Good Insulation
U Value
(rated - U Value 3.00 or lower)
Condensation Reducing
Condensation Reducing
Good Sounds Reduction
Good Sound Reduction (rated - PSR 40% or higher)
Fire Resistant
Fire Resistant
 
Can Be CIP Laminated
Can Be CIP Laminated
Can Be Screen Printed
Can Be Screen Printed
Can Be Toughened
Can Be Toughened
Can Have Metro Protect
Can Have Metro Protect

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Navigation

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The sixth edition of the Metro Glasstech online catalogue.

 

Product and Service Information

This online catalogue provides a complete guide to Metro GlassTech's product and service range. Every effort has been made to ensure the catalogue is as up to date and comprehensive as possible. If you need any further information, please don't hesitate to contact a Metro GlassTech representative.

Navigation

Finding your way around is easy, with clear headings on each page and a consistent layout in line with our previous catalogue. Each section has a different colour to make it clear where you are in the catalogue. For navigation, page numbers appear at the bottom of each page, along with forward and back buttons.

Reference

Each product has comprehensive relevant technical information, so we have developed a range of quick reference symbols that will assist you in selecting the most appropriate product for your application.

A full explanation for each performance data symbol can be viewed in Performance.

A glass dictionary is provided. This is a useful guide to terms and product names used in the glass industry and throughout this catalogue.

Information Boxes

INFO Information that is considered important is boxed out. Often this is information that is critical when specifying glass so it is advisable to read the info boxes carefully when you see them.

Performance Diagrams

Performance information on many glass products is shown in these performance diagrams. They are a quick way of evaluating the performance of similar glass products.

The diagrams depict a pane of glass with data relating to temperature and solar gain for both the inside and outside.

Refer to performance for comprehensive explanations of the icons used in the performance diagrams.

Example diagram

 

Product Photography

Colour ChartTo the right hand side of each performance diagram is a swatch showing a photographic sample of the glass.

These were photographed specifically for the catalogue to provide as accurate a comparison as possible. Reflective glass types have been shown with a slight reflection.

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Performance Data

Visible Light Transmission Visible Light Transmission
The percentage of visible light transmitted through the glass. VLT is measured in the 380-780nm wavelength range perpendicular to the surface. The higher the percentage the more daylight. Also known as Tv, Tvis, LT and VT.

Visible Light ReflectanceVisible Light Reflection
The percentage of visible light that is reflected by the glass surface, measured in the 380-780nm wavelength range perpendicular to the surface. The VLR can be given as the reflection from the external surface 1 or internal surface 2. The higher the percentage the more reflection. Also known as LR, VR and Rvis

Ultra-Violet EliminationUltraviolet Elimination
The percentage of ultraviolet radiation eliminated by the glass, measured over the 290-380 nm wavelength range. The higher the percentage the less UV is transmitted. This value is calculated from the percentage transmission of ultraviolet (Tuv). Therefore UV Elimination = 100 - Tuv

Fading Reduction CoefficientFading Reduction Coefficient
The ratio of fading reduction of a glass type when compared to the fading protection of 3mm clear float. The FRC of 3mm clear float is by definition 1.0 and represents the minimum fading protection offered by standard glazing. The lower the fading reduction coefficient, the better the fading protection offered.

Solar Heat Gain CoefficientSolar Heat Gain Coefficient
The measure of the total solar energy transmittance entering a building through the glazing as heat gain. It is the total heat transmission of direct solar transmission and that proportion of absorbed radiation that is re-radiated into the building from the action of heat absorbing glass. The lower the SHGC the better the glass restricts heat energy transmission. Also known as the Solar Factor (SF) or g.

Shading CoefficientShading Coefficient
The ratio of the total solar heat gain through a particular glass compared to the total solar heat gain through 3mm clear float glass. (86%) The shading coefficient of 3mm clear float is by definition 1.0 and represents a base glass performance. The lower the shading coefficient the less heat gain and thus more shading is provided by the glass. The shading coefficient is calculated as SC = SHGC / 0.86

Window Efficiency Rating SystemWindow Efficiency Rating System
The complete WERS rates the performance of windows including frames in various defined New Zealand climate zones. For this catalogue star ratings apply to centre of glass only (WERS cog) to compare glass types and a maximum rating of five stars indicates the best performance possible. Ratings in star and half star values are given, with five stars indicating the premium performance. Refer Section 12 (Page 105) for a full explanation of each star type.

U ValueU Value
The U Value is the measure of air to air heat transfer through glass due to the thermal conductance of the glazing and the difference between indoor and outdoor temperatures. It is expressed as W/m2K (Watts per m2 per 1° Kelvin) or W/ m2 °C. 1 Kelvin equals 1°C. The U value is a measure of the rate of heat gain or heat loss through the glazing due to environmental differences between outdoor and indoor air. It is measured at the centre of the glass (cog).The lower the U Value the lower the heat transfer, the better the insulation.

Coolness FactorCoolness Factor
The Coolness Factor (or luminous efficacy) is the visible light transmission divided by the shading coefficient.
CF = VLT / SC. It is a useful means of comparing different glass types in terms of the trade-off between light transmission and heat control in selecting glass. Glass types with a coolness factor of 1 transmit as much light as heat, those with a coolness factor lower than 1 transmit more heat than light and those with a coolness factor greater than 1 transmit more light than heat

R ValueR Value (Total Thermal Resistance)
The R Value is the value of thermal resistance of a building element which is the sum of the surface resistances on each side plus each component of a building element. It is the inverse of the U Value R=1/R and is expressed as m2 °C/W.

Sound Transmission LossSound Transmission Loss
The average Sound Transmission Loss is useful for determining the effectiveness of glazed panels to isolate exterior noise (e.g. traffic) from a building. It is derived from the average of the measured transmission loss at eighteen 1/3 octave frequency bands between 100Hz and 5000Hz, or 16 bands from 125 to 4000Hz. Average STL is measured in decibels (dB), the higher the average STL figure, the more effective glazing will be in reducing sound transmission.

Sound Transmission ClassSound Transmission Class
The Sound Transmission Class is useful for determining the noise reduction offered by internal building elements such as partitions and walls. It is a measure that relates the sound reduction performance against sounds which normally occur inside a building (such as voices, telephones, music etc). STC is a numerical class rating and cannot be compared with the STL. It is derived from a best fit curve comparison of a reference STC curve to the insulation curve. The higher the STC rating, the better the overall sound reduction.

Weighted Sound ReductionWeighted Sound Reduction Index
The Weighted Sound Reduction Index incorporates frequency modified correction for the human ear’s response. The RW is reported in dB and is a composite rating of sound reduction at frequencies from 100 - 5000Hz. Numerically, it is comparable to the STC values but the numbers are in dBA.

Perceived Sound ReductionPerceived Sound Reduction
The percentage by which the human ear detects a lessening in sound pressure or noise is known as the Perceived Sound Reduction. A 10dB reduction in sound pressure level is generally perceived as a halving of the original noise. Sound reduction values are ‘weighted’ and used to calculate the perceived sound reduction as a ratio relative to the RW for 3mm clear float. The dB difference in the RW value for a glass type when compared to 3mm float is calculated as a perceived sound reduction percentage. For other sound indices see Section 11.4.5 and 11.4.6

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