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谁做过IEC 60950-22 Equipment to be installed outdoors中的附录D Gasket tests?
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7 m$ {5 ?: G! D/ r! E) D! }2 }1 V其中的- W. b$ b2 t$ J
D.2 Tensile strength and elongation tests7 j0 C. |! [" q7 K+ _8 s
This test is applicable to gaskets, which can stretch (such as O-rings). Gasket material, shall6 \% L0 s5 d- L
be of such quality that samples subjected to a temperature of 69 °C to 70 °C in circulating air
+ k+ h" o+ E" @2 @for 168 h have a tensile strength of not less than 75 % and an elongation of not less than
$ E7 o9 v+ i4 N6 J0 K9 o4 `60 % of values determined for unaged samples. At the conclusion of the tests, there shall be
- V( z. `( I) O0 m- Q: e( Vno visible deterioration, deformation, melting, or cracking of the material and the material
' ?. u( D# v% F9 s5 v& h( I; ~0 sshall not harden as determined by normal hand flexing.
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8 L1 o9 Y0 e0 w9 P3 G" B c这里抗拉强度和伸长率怎么测定?试验方法如何?有参考标准吗?950-22这部分讲的太含糊了。 |
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