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这个不需要认证的,直接可以作为绝缘材料,在标准中叫vulcanized fiber。6 j+ T! V' D6 d# V* G% z5 Q/ _, m
UL153:
6 r; F3 @, F2 q8 S25 Insulating Materials
, l7 Q4 `) j! y25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
% v( U- Z m% r$ b8 W/ f' Q' T; Botherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
" P; u0 O, j7 G6 `( Llocated that it is not adversely affected by arcing, except that vulcanized fiber not less than 1/64 inch (0.4 mm) thick is able to be used in addition to an air spacing of not less than 50 percent of the spacing required for air alone. |
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