这个，好像我碰到的怎么说都可以，但是正是的场合，我见得pvc-u多。

我感觉硬聚氯乙烯和软聚氯乙烯都是用PVC-U表示,所以UPVC和PVC-U是一个意思.

都一样的.表达的是同一种管材,正式的表达方式是PVC-U

正式的表达方式应该是PVC-U!
我被审图中心的说教了一回!
教训吧!

硬聚氯乙烯是UPVC，PVC－U是未增塑聚氯乙烯，而UPVC是增强聚氯乙烯。

有规范，就要以规范为主，使用规范的用语，避免歧义。

国际标准化组织正式规定，PVC-U是正规写法

PVC-U used to be called uPVC (for unplasticised PVC) but in 1990 the name was changed to conform to the international naming conventions for polymers. This was so that polymer databases would work correctly.

The standard international name of any plastic is now in two parts: the basic material name is given first and any special properties are given after a hyphen, ALL THE LETTERS ARE IN CAPITALS!

Low Density Polyethylene (old name - LDPE), Linear Low Density Polyethylene (old name - LLDPE) and High Density Polyethylene (old name - HDPE) are all types of polyethylene (PE) but would not appear to be such if indexed alphabetically in a database.

The new names have the polyethylene name first and the special properties second. The new abbreviations are Low Density Polyethylene (PE-LD), Linear Low Density Polyethylene (PE-LLD) and High Density Polyethylene (PE-HD). This means that families of polymers are kept together in a database.

The new correct name for uPVC is therefore PVC-U where PVC is the base polymer and the U refers to the unplasticised version of PVC. All the letters in the name are in upper case and PVC-u is incorrect!

If you see someone using PVC-u you now know that they are incorrect and don’t know what they are talking about. Keep an eye out for it - even the most respectable people make the mistake.

My favourite polymer is PPTKO also known as "Polly Put The Kettle On".

For more details of Polymer Names see Polymer Names

http://www.tangram.co.uk/index.htm

习惯用UPVC