Pvc有嘛危害专家告诉你

[skyccnicke]

　　目前市场上出售的保鲜膜从原材料上主要分为两大类：第一类是聚乙烯（PE），第二类是聚氯乙烯（PVC ）。天津大学教授盛京告诉记者，聚氯乙烯中的氯是有毒的。在国外，用PVC制作食品保鲜膜是决不允许的，由 于氯乙烯单体在聚合时会不完全，而随着时间的推移，它就会从聚氯乙烯产品中游离出来，同时，PVC是一种硬 塑料，要将它拉成透明柔软的保鲜膜，必须加入大量增塑剂，而部分含苯的增塑剂有致癌性是众所周知的，由于很 多增塑剂具有脂溶性特征，因此当PVC保鲜膜遇上熟食的油脂，其中的增塑剂更容易释放出来，渗入食物之中， 而在加热时，会加速塑化剂中化合药剂释放到食物中。据了解，部分增塑剂对人体内分泌系统有很大破坏作用，会 扰乱人体的激素代谢，食用后会引起妇女患乳腺癌、新生儿先天缺陷、男性精虫数减低，甚至精神疾 病等。
　　用眼看用火烧区分“两P”
　　天津大学教授黄定海通过本报介绍了两大区分PE和PVC的小窍门：
　　一、“看”
　　看产品有没有产品说明，如果上面打着PE字样,盟特新奇特批发，消费者就可以放心地使用；如果写着PVC或者是根本没有写原料的话，那就尽量别买,光波炉厂家。另外,盟特，用PVC制作的保鲜膜重叠数层后，呈浅蓝色,光波炉官网，而PE制成的产品重叠则呈乳白色。
　　二“火烧”
　　聚乙烯保鲜膜用火点燃后，火焰呈黄色，离开火源也不会熄灭，有滴油现象，并且没有刺鼻的异味；而聚氯乙 烯保鲜膜由于含有氯元素，用火点燃后火焰呈黄绿色，烟雾比较大，没有滴油现象，离开火源后会熄灭，而且有强 烈刺鼻的异味。

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22130001 2008 年 02 月 13 日 19:17 Reading (loading. ..) Comments (0) Category: Miscellaneous world Kan
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Moonstone Moonstone is a feldspar gem of a family, the English name for the MOONSTONE, literally or Moonstone. As it often is milky white, translucent color with a pale blue halo, as if in March the dim moonlight clear after the rain, hence the name moonstone. For centuries, the Moonstone gem is a popular one, people believe it sweetheart gentle wake-up enthusiasm, it Pearl, Alexandrite is June with the birth of one of those lucky stone, a symbol of wealth and longevity.
Moonstone gentle iridescence iridescence known as adularia, which is within the orthoclase with albite Dan Shuangjing some fine films, diffuse reflection of light generated to produce interference effects. The more red double-chip thin, the more bright the moon formed, the formation process can sometimes seem a good
1. Moonstone
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When these characteristics is not apparent, we have to by measuring the refractive index and the proportion of stones were distinguished.
identify key typical cleavage, characteristic inclusions. The price is mainly affected by Moonstone
iridescence beautiful gem level,mbt sport shoes, precious stones the size of the number of defects,mbt shoes, transparency and processing quality and other factors.
large grain market (2-carat or more) of the Moonstone is not uncommon, but not a lot of perfect iridescence. Many Moonstone's iridescence, or not enough light, or deviation from the gem right in the middle of beautiful stones leaving prices down. In addition, some gems within the structure of thick, clear or cleavage cracks low transparency also reduced the prices of precious stones. Multi Gem Moonstone
ground arc,mbt shoes sale, the lower part of thick waist precious stones inlaid affect and reduce the price per carat gem.
assessment of critical perfect,
2. Moonstone Moonstone origin
has produced many places, but with the origin of commercial production does not have much value. Important source of Moonstone on the market are mainly in Myanmar and Sri Lanka.
3. moonstone jewelry buying tips
(1) Moonstone's
(2) Moonstone thickness should be moderate, not suitable for thick.

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