BS ISO 20058:2016 pdf free

BS ISO 20058:2016 pdf free.Rubber thread一Specification
This standard specifies physical and mechanical requirements for rubber threads. It does not cover rubber threads for food contact, furniture, high heat resistance and high ozone resistance applications.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2321, Rubber threads – Methods of test
For the purpose of this document, the terms and definitions given in ISO 2321 apply.
Rubber threads are classified according to cross-sectional shape into three types:
a) Type 1:a round thread;
b) Type 2: a square thread;
c) Type 3: a rectangular thread
The types of rubber threads as mentioned above are further sub-divided into three classes depending on the properties;
The rubber threads shall be uniform in dimension, free from any visual substances, and lack of other defects, which may cause deleterious effects on its performance.
Conventional count (size number) should be agreed between the purchaser and manufacturer.
When tested in accordance with Clause 4 of ISO 2321, the tolerance of thread diameter (round thread) or cross-sectional length (square or rectangular thread) shall be less than ±3%，unless otherwise specified. Metric yield when tested according to ISO 2321, Clause 5, shall be within ±6% of the specified value.
Specified value for metric yield to be mentions depending on count and density.
If density is required upon the agreement between the purchaser and the manufacturer, it can be converted from metric yield or tested according to ISO 2321, Clause 7. It shall be as follows:
Density< 1.10 Mg/m3 marked as low density;
Density= 1.10-1.20 Mg/m3 marked as medium density;
Density > 1.20 Mg/m3 marked as high density
Physical and mechanical properties of rubber threads shall comply with the requirements given in Table 1.
NOTE The age of test pieces shall not exceed 6 months from the date of manufacture.
If Schwartz value is required, it can be recommended the requirement given in Annex B.
The material shall be packed to facillitate safe transport and storage.BS ISO 20058 pdf free.