Immersion test international standards

The international standards for immersion testing of rubber deal with the change in weight and volume of rubber samples when they are immersed in various corrosive liquids. The details of these specifications are given below for reference. 

Table 8.1 International standards for immersion testing of rubber...

Though a standard norm or absolute reference value is not available for comparison in any of the international standard specifications and the technical and research publications with respect to the chemical resistance properties of rubber, liquid immersion tests certainly provide relative and useful data with which the suitability of anticorrosive rubber lining compounds can be assessed with a fair degree of accuracy. For this reason manufacturers and applicators of rubber lining resort to tests under simulated conditions instead of accelerated ageing immersion or swelling tests. 

U50 000 psi IB, minimum = 60 psi and linear expansion, maximum = 0.25. Properties of all examples given in Table II substantially surpass the comercial standard and also surpass the properties of the PF control boards with respect to linear expansion, thickness swelling, and absorption in the one-hour boil test. Internal bonds, both initial and after the one-hour boil test, and water immersion results of the HDA experimental boards were slightly inferior to results of these tests for the PF control boards. Properties of urea-formaldehyde control boards were similar to the PF control boards excepting in the one-hour boil test where complete failure of all bonding took place in about 15 minutes. 

Test Preparation Transfer about 50 mg of sample, accurately weighed, into a glass-stoppered, 25-mL conical flask add 5 mL of Internal Standard Solution by pipet and mix to dissolve. Immerse the flask in a water bath maintained at a temperature between 45° and 50°, and volatilize the chloroform with the aid of a stream of nitrogen. Add 3 mL of Propionating Reagent, and heat at 75° for 30 min. Volatilize the reagents with the aid of a stream of nitrogen at room temperature, add about 5 mL of chloroform, and mix. 

A laboratory immersion test for corrosion in hydraulic brake line fluid is described in Motor Vehicle Brake Fluid SAE J1703. This test includes the use of standard metal coupons for mass change and visual examination after immersion at 100°C in the brake fluid. Other tests are used to evaluate specific components in the braking system such as that described in SAE J1047 for hydraulic brake line tubing. Internal corrosion is not considered as important as external corrosion of the braking system and therefore only simple tests are used outside of on vehicle service tests. 

When it comes to textiles, dimensional stability has attracted a lot of standards attention, and there are at least five international methods as well as national equivalents. The ISO methods cover washing and drying [65], free steam [66], cold water immersion [67], and dry heat [68], The fifth standard covers the preparation, marking, and measuring of specimens and garments for dimensional change tests [69]. 

G31-72, Standard practice for laboratory immersion corrosion testing of metals. Annual Book of ASTM Standards, ASTM International, Philadelphia, Pa., 2000, p. 99, Vol. 3.02. 

ASTM G 31 Standard Practice for Laboratory Immersion Corrosion Testing of Metals, Annual Book of Standards, Vol. 03.02, ASTM International, West Conshohockra, PA, 1993. 

The information is based on experiments, immersion ond, when available, on data from tests which include temperature and pressure os stress factors. The results achieved in immersion experiments cannot be opplied without reservation to pipes under stress, i.e. internal pressure, os the factor "stress corrosion crocking" Is not token into consideration. In certain cases it can be of advantage to test the suitability under the planned working conditions. The tests referred to hove been carried out partly by George Fischer and partly by the International Stondardizotion Organization (ISO) or notional standards organizations. 

Adhesives for ceramic tiles are specified by the standard EN 12004 2007 (Adhesives for tiles. Requirements, evaluation of conformity, classification, and designation), and includes performance requirements for cementitious, dispersion, and reaction resin adhesive types for all internal and/or external wall, floor and ceiling applications. Annex ZA, of this standard, sets out the requirements, which address the provisions of the Construction Products Directive (see O Sect. 35.4 below), and include assessments of durability. Compliance with these requirements confers a presumption of fitness for purpose for the applications and form part of a CE mark. In these cases durability is assessed by elevated temperature and/or water immersion accelerated ageing or freeze-thaw cycling of test specimens and then determining tensile or shear adhesion strength against minimum requirements. 

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