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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。
* W$ s4 s, y8 e$ uUL153:5 l1 \! ?$ g( b, X$ u
25 Insulating Materials/ Y0 y$ m+ B/ @' Y# Y5 {
25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not& L1 r' Z2 x/ }. a- x$ t
otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
# o: I' T5 ?! }8 Glocated 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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