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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。$ R2 G; m' A8 g8 b: c
UL153:* R, ^6 G8 M! \% [; x& F8 h0 |
25 Insulating Materials0 Y5 o5 K6 q0 X/ K+ T! R$ h
25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
( j: U. R* i0 `* T h% sotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
q% Y9 c% {$ |- n2 j# s0 ?located 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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