E-CR glass

Fibers Tvpical E-glass variants E-CR glass HS-glass HM-glass Oxynitride fibers ... 

Fiberex, Ltd - http //www.fiberex.com/ Canada, boron- and fiuoride-free E-CR glass fiber rovings for composite reinforcement applications... 

Other glass fibres that might be used under certain circumstances are E-CR glass, R-glass and AR-glass. 

The effect of sustained stress has been measured in air and water for both E glass and E-CR glass laminates. 

E-CR Glass Update 1 (1991) Owens Corning Fiberglas, Battice. 

E-CR glass has better resistance than E-glass to acid attack for a variety of acids when immersed for various periods of time (Figure 9.10). This arises because of the different chemical composition of the two glasses (Table 2.3). 

For strength retention under acidic conditions, E-CR glass performs better than E-glass. The ASTM-recommended norm (ASTM D 3681) (Figure 9.11) appears to be conservative for both E-glass and E-CR glass. 

E-CR Glass Update 1 (1991) Owens Corning Fiberglas, Battice — a comprehensive review of the existing data and trends for E-glass and E-CR glass exposed to various environments. 

A number of creep studies have already been discussed in Chapter 9 on environmental resistance. These include composites involving E-glass or E-CR glass in air, water and chemical environments (Table 10.1). 

For all service temperatures, the first randomly oriented fiber layer in the chemical barrier layer should be comprised of E-CR glass fibers. If no chemical barrier layer is created (for applications below 40 °C), the first layer of unoriented fibers in the load bearing laminate should consist of E-CR randomly oriented fibers. 

For exposure media according to Table A.55 at service temperatures > 40°C, and for exposure media of class III and IV at any temperature, E-CR glass fibers must be used in the load bearing laminate, if E-CR glass fibers are used in layers b and c of the chemical barrier layer (see Table A.48). 

E-CR glass (CR indicates corrosion resistant)—similar to E glass, bnt alkali and BjOj are each less than 1 percent. It has improved acid durability. 

Ac/vantex —a boron-free E glass that, according to manufacturer (Owens-Corning), combines the advantages of E and E-CR glasses and has higher temperature capability. 

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