Standard test method for rubber property after conditioning with liquids and temperatures

ASTM D 471 - This test method covers the required procedures to evaluate the comparative ability of rubber and rubber-like compositions materials to withstand the effect of liquids.

This test method provides procedures for exposing test specimens to the influence of liquids under definite conditions of temperature and time. Rubber products are used under exposure to Chemicals, Oils, Greases, Fuels and othe fluids. The Rubber material undergo deterioration on contact with these substances. The effect of such contact on physical properties can be evaluated.

For weight change, the initial weight of the test samples is measured and recorded. The samples are then immersed in the specified liquids in appropriate containers - volatile liquids such as fuels require special consideration. The containers are then placed in ovens at the specified temperatures for the specified time periods. At the end of the exposure period, the samples are allowed to return to room temperature. The samples are wiped dry and the final weight is measured and recorded.

Equipment Used: Mainly Mettler balance and Ovens

The standard specimen is 25 x 50 x 2mm (1" x 2" x 0.08")

The resulting deterioration is determined by measuring the changes in physical properties, such as stress/strain properties, hardness, and changes in mass, volume, and dimension, before and after immersion in the test liquid.

This test method includes the following:
1. Change in Mass (after immersion)
2. Change in Volume (after immersion)
          Weight change is expressed in percent. 
          Percent Weight Change = [(Final weight - Initial weight)/ Initial weight] x 100
3. Dimensional-Change Method for Water-Insoluble Liquids and Mixed Liquids
4. Change in Mass with Liquid on One Surface Only
5. Determining Mass of Soluble Matter Extracted by the Liquid
6. Change in Tensile Strength, Elongation and Hardness (after immersion)
7. Change in Breaking Resistance, Burst Strength, Tear Strength and Adhesion for Coated Fabrics

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