1
請教各位材料的專家,標(biāo)準(zhǔn)UL 1581上規(guī)定UL 60度的
護套料老化后抗張強度的保留率為:大于等于85%
斷裂伸長率的保留率為:大于等于45%
沒有具體說明護套材料老化前和老化后的變化率為多少?請問各位大俠UL護套材料有沒有這個變化率的要求。
2
護套材料老化前和老化后的變化率就為你上表所寫的數(shù)據(jù)呀!
3
按照UL444第四版的標(biāo)準(zhǔn),條款7.8.2所述,UL CM等級60C的護套應(yīng)該在 100 ±2°C老化7天后,只要拉伸達到未老化前的50%,擴張達到未老化前的75%,就是合格的,而不是依據(jù)UL1581來判定。
7.8.2 For cables to be rated 60°C, jacket material removed from a length of finished cable shall meet the
aging test as follows. After 7 d, at 100 ±2°C, there shall be at least 50% retention of the unaged elongation
and 75% retention of unaged tensile strength when six specimens are tested in accordance with the test
procedures in CSA C22.2 No. 2556 or UL 2556, with the following modifications: