ISO 3387-2020 pdf free.Rubber — Determination of crystallization effects by hardnessmeasurements.
This document specifies a test based on hardness measurements for determining the progressivestiffening of rubber with time, caused by crystallization. It is limited to materials having an initialhardness at a test temperature of from 10 IRHD to 85 IRHD.
The method is applicable to raw, unvulcanized (compounded) and vulcanized rubber. It is mainly ofinterest for rubber with a marked crystallization tendency at temperatures experienced in coldclimates, such as chloroprene and natural rubber.
The method is not applicable to fast-crystallizing materials which crystallize to a considerable degreewithin the timespan of 15 min used for conditioning at test temperature.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO 48-2:2018,Rubber,vulcanized or thermoplastic – Determination of hardness — Part 2: Hardnessbetween 10 IRHD and 100 IRHD
ISO 18899:2013, Rubber — Guide to the calibration of test equipment
ISO23529,Rubber —General procedures for preparing and conditioning test pieces for physical test methods
All final handling and measurements shall be made within the cold chamber while the test temperatureremains within the permissible limits.This can be done by providing suitable equipment which permitsmanipulation of materials within the chamber from the outside (for example, by means of handholesand gloves through the door or wall of the cabinet).
Hardness gauges, in accordance with IS0 48-2.Lubricants, if used, shall be of a type not causingfriction in the instrument at the test temperature.The hardness gauge used in this test procedure is normally conditioned and operated inside the coldchamber. Alternatively, a special device may be used where the body of the hardness gauge is placedoutside the cold chamber and connected with the indenter in the cold chamber by means of a rod withlow heat-conductive capacity, and constructed to avoid the introduction of additional friction.ISO 3387 pdf download.