BS ISO 188:2011 pdf download.Rubber, vulcanized or thermoplastic – Accelerated ageing and heat resistance tests.
BS ISO 188 specifies accelerated ageing or heat resistance tests on vulcanized or thermoplastic rubbers. Two methods are given:
Method A: air-oven method using a cell-type oven or cabinet oven with low air speed and a ventilation of 3 to 10 changes per hour;
Method B: air-oven method using a cabinet oven with forced air circulation by means of a fan and a ventilation of 3 to 10 changes per hour.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD)
ISO 18899:2004, Rubber— Guide to the calibration of test equipment
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test
methods
3 Principle
3.1 General
Test pieces are subjected to controlled deterioration by air at an elevated temperature and at atmospheric pressure, after which specified properties are measured and compared with those of unaged test pieces.
The physical properties concerned in the service application should be used to determine the degree of deterioration but, in the absence of any indication of these properties, it is recommended that tensile strength, stress at intermediate elongation, elongation at break (in accordance with ISO 37) and hardness (in accordance with ISO 48) be measured.
3.2 Accelerated ageing by heating in air
In this method, the test pieces are subjected to a higher temperature than the rubber would experience in
service in order to produce the effects of natural ageing in a shorter time.
3.3 Heat resistance test
In this method, the test pieces are subjected to the same temperature as they would experience in service.
4 Apparatus
4.1 Air oven
4.1.1 General
The oven shall be of such a size that the total volume of the test pieces does not exceed 10 % of the free space in the oven. Provision shall be made for suspending test pieces so that they are at least 10 mm from each other and, in cabinet ovens and ovens with forced air circulation, at least 50 mm from the sides of the oven
The temperature of the oven shall be controlled so that the temperature of the test pieces is kept within the specified tolerance for the specified ageing temperature (see Clause 8) for the whole ageing period. A temperature sensor shall be placed inside the heating chamber close to the samples to record the actual ageing temperature.
No copper or copper alloys shall be used in the construction of the heating chamber.
Provision shall be made for a slow flow of air through the oven of not less than three and not more than ten air
changes per hour.
Care shall be taken to ensure that the incoming air is heated to within ±1 C of the temperature of the oven before coming in contact with the test pieces.
The ventilation (or air change rate) can be determined by measuring the volume of the oven chamber and the flow of air through the chamber.BS ISO 188 pdf free download.
Tags: Rubber, vulcanized or thermoplastic
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