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مونومر دو-پیوندی اتیلن پروپیلن
(8) b EPDM High water resistance but deter- iorates when exposed to air and sun.
Neoprene, natural rubber and EPDM (ethylene proplene diene monomer) natural rubber are the main materials cur- rently being used and, as illustrated in Fig. 9 (3), the seals are anchored at the ends and configured so that they are permitted to fold or flex as the joint opens and closes.
3.5.5 Compression seals-Preformed compression seals are compartmentalized and extruded, to the required config- uration, from elastomeric compounds, most commonly neo- prene and EPDM.
3.5.8 Tension-compression seal systems-Compared to other preformed sealant materials, tension-compression seal systems are composed of relatively massive, molded, block style elastomeric material, commonly neoprene or EPDM, in which a metal bridging plate may be incorporated, either at its surface or embedded within.
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