Alternative Weaves, Finishes and Coatings Glass fabrics are generally woven from 'E' glass yarns, although other types of glass are used for special applications, including S2 glass for defence applications. A wide variety of chemical treatments are offered to improve fabric properties and/or to make fabrics more suitable for customers' further processing. Fabrics are offered laminated to aluminium foil or coated with elastomeric or other proprietary coatings. Elastomeric coatings include NeopreneTMand silicone rubber and recently introduced proprietary coatings include Tyglas VC (an aluminised coating for valve covers and other insulation applications) and Tyglas FB (developed to satisfy the requirement of BS 6575 for fire blankets). Varying weave constructions produces different physical characteristics, which may be beneficial for a particular usage. The four principal weaves are: Plain for abrasion resistance and stability. Ideally suited to flat surfaces. Twill for covering curved surfaces. Satinmore suitable for draping providing increased flexibility. Matt similar to plain, but with greater strength.