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GMW3136

3rd Edition, October 2016

Complete Document

Automotive Safety Glazings



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Product Details:

  • Revision: 3rd Edition, October 2016
  • Published Date: October 2016
  • Status: Active, Most Current
  • Document Language: English
  • Published By: General Motors Worldwide (GMW)
  • Page Count: 35
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

Introduction

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. This specification contains the product, property and performance requirements for GM Automotive glazings. It supersedes all GM regional glazing standards.

International GM glazings must meet the requirements of regional legal standards where applicable as listed here, but not limited to:

• Republic Of China - GB 9656

• Europe – UN ECE R43, GTR 6

• North America – Federal Motor Vehicle Safety Standards (FMVSS) 205/Canadian Motor Vehicle Safety Standards (CMVSS) 205

• Brazil – Inmetro 156 and Inmetro 157

Typical Applications. Typical applications include all vehicle front, side, roof and rear glass and sunroof glazing. Other automotive glass for mirrors, bulbs, lenses, etc., do not fall within the realm of this specification.

Applicability. This document is applicable to all GM automotive glazing for the following types, subclasses and classes.

Glazing Types and Subclasses

Type 1: Clear Safety Glazing. Clear safety glazing has no added tints. This Type of glass is not recommended for use, except in non-air conditioned vehicles in emerging markets.

Type 2: Tinted Safety Glazing. Tinted safety glazing is any color other than clear and generally has specified physical properties, such as reduced light transmittance or increased absorption of solar energy. Tinted glazing is available for all classes of glazing.

Type 3: Privacy Glazing. All classes of glazing with or without a vacuum deposited or fired-on metallic reflective film. Visible light transmittance is below the 70% FMVSS requirement (see Transmission chart in 3.2.1.1). These windows are only allowed in certain areas as defined by legal standards. Privacy glazing is available in a Green Family and a Gray Family. When sourcing a vehicle, all privacy glazing for a vehicle must be from the same family. Privacy is divided into 4 subclasses as defined by maximum total visible light, TL.

Subclass I, < 40% TL.

Subclass II, < 20% TL.

Subclass III, < 10% TL.

Subclass IV, < 5% TL.

Type 4: Solar Control Glazing. This type of glazing is designed to absorb and/or reflect ultraviolet and infrared light while maintaining visible light requirements. The following describes the 2 subclasses.

Type 4: Subclass I, Absorbing Glazing. The absorbing characteristics of the glazing material result from the homogeneous composition of the material.

Type 4: Subclass II, Reflective Glazing. Reflective glazing (coated) is comprised of a clear or a tinted layer of glazing with a single or multilayer metallic reflective coating. 

Classes.

Class A: Laminated Safety Glass. This glass consists of two layers of float glass which are held together by an interlayer of automotive grade plasticized polyvinyl butyral (PVB) sheeting. The sheeting material may be clear, tinted or shadeband colored.

Class B: Tempered Safety Glass. This glass consists of a single sheet of float glass subjected to a specific heat treatment or tempering process to produce safety characteristics. Due to internal stresses set up by the tempering process, any attempt to further cut, drill, or edge after treatment will cause fracture.

Class C: Glass-Plastic Safety Glazing. A laminate of one or more layers of glass and one or more layers of plastic in which a plastic surface of the glazing faces inward when the glazing is installed in a vehicle.

Class D: Plastic Safety Glazing. Glazing comprised of single or multiple layers of plastic materials, as specified on the engineering drawing. 

Class E: Acoustic Windshield Glass. Annealed laminated glass with improved sound level attenuation for use in windshields. Class E glass is divided into the following categories:

• Class E-I: Homogenous Acoustic PVB

• Class E-II: Trilayer Acoustic PVB

See Appendix C (Table C1 and Table C2) for Acoustic Performance Specification of this product.

Class F Heat Strengthened Laminated Glass. This glass consists of two layers of heat strengthened float glass, which are held together by an intervening layer of automotive grade PVB sheeting. This glass is for use in openings other than windshields, typically for improving sound attenuation. Class F glazing is divided into the following categories:

Class F. Heat strengthened laminated glass, standard PVB.

Class F-I. Heat strengthened laminated glass, homogenous acoustic PVB.

Class F-II. Heat strengthened laminated glass, trilayer acoustic PVB.

Class F-III. Heat strengthened laminated glazing, Enhanced Technology Glass (ETG).

Class G Chemically Tempered Laminated Glass. This glass consists of two or more layers of chemically tempered glass, which are held together by an intervening layer of automotive grade PVB sheeting or automotive grade interlayer material. This glass is for use in fixed openings other than windshields. The typical use of this construction is for lightweight applications. Class G glazing is divided into the following categories:

Class G. Chemically tempered laminated glass, standard PVB.

Class G-I. Chemically tempered laminated glass, trilayer Acoustic PVB