标准编号：ISO 21306-2:2019
中文名称：塑料 未增塑聚氯乙烯（PVC-U）模塑和挤出材料 第2部分：试样的制备和性能的测定
英文名称：Plastics — Unplasticized poly(vinyl chloride) (PVC-U) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties
发布日期：2019-03
标准范围
This document specifies the methods of preparation of test specimens and the test methods to be used
in determining the properties of PVC-U moulding and extrusion materials. Requirements for handling
test materials and for conditioning both the test material before moulding and the specimens before
testing are given.
The properties required for the designation of PVC-U thermoplastics are given in ISO 21306-1. All
properties are intended to be determined by the appropriate methods referred to in this document and
values obtained shall be presented as laid down in ISO 10350-1.
The values determined in accordance with this document are not necessarily be identical to those
obtained using specimens of different dimensions and/or prepared by different procedures. The values
obtained for the properties of a moulding depend on the moulding compound, the shape, the test
method and the state of anisotropy. The last-mentioned depends on the gating of the mould and the
moulding conditions, for example temperature, pressure and injection rate. Any subsequent treatment
is also be considered, for example conditioning or annealing.
The thermal history and the internal stresses of the specimens can strongly influence the thermal and
mechanical properties and the resistance to environmental stress cracking, but exert less effect on the
electrical properties, which depend mainly on the chemical composition of the moulding compound.
In order to obtain reproducible and comparable test results, the methods of preparation and
conditioning, the specimen dimensions and the test procedures specified herein are used. Values
determined are not necessarily be identical to those obtained using specimens of different dimensions
or prepared using different procedures.
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