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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。/ \$ |" c f+ t; b7 }4 ^4 h# f
UL153:
, h/ x/ C: |& K5 I5 X" U O W25 Insulating Materials6 G3 C d7 m: o2 e1 w
25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not2 a7 y4 y0 W$ s5 ~+ p- W5 [' R
otherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so" m* i% P* Q3 Q" v) `% J
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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