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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。& @7 [$ F& s) k% ]9 ~# |% S
UL153:9 H6 T) e2 f" Y% P0 T! l% B% V
25 Insulating Materials' C7 d( _, a) c5 `) N. m" ?' h
25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
2 r% l# D5 t* notherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so
( A2 I" z( w- C- f$ r+ n9 A+ g% |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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