PVC???????

??????
????
???????
???
SVSY 50??4 SVSY 42??4 SVSY 33??4 SVSY 28??4
?????
3.2mm 2.8mm 2.2mm 2.0mm
?????
2.6mm 2.0mm 1.8mm 1.6mm
????
6m
???
?????????

????
?????????????????????????????????????????????????????????????????????
?????????????????14% 
??????????С??1%
??????????????С??38mpa
?????????????С??78??
?????義????????8%
????????飺???1??????????1???????о????????
??????????????300
????1.35??1.5g/cm3
?γ???????
1?????????????γ???????λ????????????·???????γ????????200m,???????·?????γ????????300m,????γ?????????
2????ι??????????衣??????·???????????????????????????γ??С???????????????γ???
3????????????????С??10m??????????н???????????ι??????з?????????????S?????????????????????н?С??90?????????????U????????
??????????
1??????????????????ù???????????????50mm?????????
2???????????????????ù??????????????????????????????50mm?????????
3?????????????????????ù?????????200mm?????????
4????????????????????岻????????????????????????????
5??????????????λ?????????????????????ù????????е???????????????????л?????????

???????

??????????????

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