PET，中文称聚酯，一般我们操作的时候很多人叫它涤纶。
一般废塑料行业里PET做的最多的是瓶片，其中包括了各种可乐瓶，矿泉水瓶等。
瓶片的分类：
进口的瓶片一般分为：
1，净片即干净无杂质不含PVC或者PVC（聚氯乙稀）不超过千分之三其中包括的水份另算。净片包括白片（即无色透明的瓶粉碎料）、白蓝片、白蓝绿片（俗称三色片）绿片、杂色片、价格以白片最高，依此类推
2，毛片即包含瓶子的包装纸和瓶盖的粉碎料，其中有只包含包装纸的毛片。这种相对来说比较好。毛片也有干净和不干净之分，一般来说，日本和台湾的毛片比较干净，德国或者是欧洲的毛片似乎没有进行过清洗。一般毛片最次的是有20％的杂质的。但大多数毛片都应该在10-12％点杂质。日本有种比较好的，只有5％杂质，这个就看供货商了。
毛片的价格，如果在同情况下也是按照净片颜色的分类。
瓶片的指标及鉴别
首先是用途的不同导致了厂家对指标的要求不同。
吹瓶厂要求的指标是熔点 250度粘度 0.7以上且不能有一点杂质。
短纤厂要求的指标是熔点 250度粘度 0.6以上
可以看出吹瓶厂要求的相当高，但是从去年来说，他们以往的价格优势已经没有了，现在基本都出货给化纤厂。
如何鉴别这些货物的指标呢。
1，先闻味道，PET的味道不同一般塑料。用打火机烧一下，然后会闻到非常芳香和舒适的味道（随便烧个瓶子来闻闻），如果PET里含有其他成分，味道就很刺鼻。有种瓶子里面含有SEBS的成分就不能用。
2，看烧起来的部分，如果过分发黑或者油滴的很快，多数熔点不正常，这在PET薄膜片中常有。
3，拉丝，烧着的时候在打火机上拉一下丝，看丝拉的长不长，然后把拉出来的丝拉断，看中间的断点，丝是不是卷成小圈状，卷的越多说明熔点高。不过一般如果是瓶片，应该都不会有什么大问题。最关键的一点！是分辨其中是否含有PVC，这可是PET的致命伤。
首先多取样，然后平铺在阳光充足的地方，PVC在阳光下呈淡蓝色。如果对折当中会有白色的折痕。
以上是肉眼鉴别，准确性有限，主要看经验。
还有种比较实用更好的方式。买个烤箱吧。把温度调到250度就在那里烤上半小时。如果货含有PVC的话，表面会有非常多的黄色斑点。如果熔点不够就会很快的融化。
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FTL stack trace ("~" means nesting-related):
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Java stack trace (for programmers):
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freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:80)
at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:43)
at freemarker.core.NonHashException.<init>(NonHashException.java:49)
at freemarker.core.Dot._eval(Dot.java:48)
at freemarker.core.Expression.eval(Expression.java:81)
at freemarker.core.BuiltInsForMultipleTypes$stringBI._eval(BuiltInsForMultipleTypes.java:692)
at freemarker.core.Expression.eval(Expression.java:81)
at freemarker.core.EvalUtil.compare(EvalUtil.java:111)
at freemarker.core.ComparisonExpression.evalToBoolean(ComparisonExpression.java:62)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:48)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.include(Environment.java:2509)
at freemarker.core.Include.accept(Include.java:171)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.include(Environment.java:2509)
at freemarker.core.Include.accept(Include.java:171)
at freemarker.core.Environment.visit(Environment.java:327)
at freemarker.core.Environment.visit(Environment.java:333)
at freemarker.core.Environment.process(Environment.java:306)
at freemarker.ext.servlet.FreemarkerServlet.processEnvironment(FreemarkerServlet.java:946)
at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:910)
at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:769)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.kenfor.iyong.web.util.filter.NotAllowedToTunFilesFilter.doFilter(NotAllowedToTunFilesFilter.java:154)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at com.kenfor.iyong.web.util.filter.InvalidXSSFilter.doFilter(InvalidXSSFilter.java:40)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:26)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.ajp.AbstractAjpProcessor.process(AbstractAjpProcessor.java:873)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:687)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)