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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。! f% o! u* J5 O& [/ J
UL153:. J9 p$ b- x5 B! ^* P0 h
25 Insulating Materials
% y% U) E7 {, s: T6 A25.2 An insulating lining or barrier of vulcanized fiber or similar materials used where spacing does not
; l9 G- Y' a6 Fotherwise comply with the requirement shall not be less than 1/32 inch (0.8 mm) thick, and shall be so' `; @* O8 z# q" P' M
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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