Liquid Resistance Tests
Laboratory > Ageing
Liquid Resistance Tests | |
Weathering standards for the aging of plastics and polymers | |
The norms that regulate the tests of evaluation of the behavior of the vulcanized ones against liquids, and in turn the necessary procedures to evaluate the comparative capacity of the rubber compositions. The rules are; UNE 53540, ISO 1817-1985 and ASTM D471, these standards describe the evaluation methods. | |
Evaluation methods | |
For classification purposes, it is necessary to define a series of test liquids, which allow comparative results to be obtained. | |
List of fuels, oils and fluids | |
List of fuels, oils and reference fluids cited in the specifications of the rubbers. Although most test fuels are associated with the automotive gasket market, these reference fuels are often found in the specifications of rubber articles in a variety of industries to create a benchmark for fluid resistance . It is best to consult an experienced rubber technician to explain the consequences, value and limitations of these and other reference fluids. Fuel patterns Fuel A - Iso Octane 100% vol. Fuel B - Iso Octane 70% vol. + Toluene 30% Vol. Fuel C - Iso Octane 50% vol. + Toluene 50% Vol. Fuel D - Iso Octane 60% vol. + Toluene 40% Vol. Fuel E - Tolueno 100% Vol. Fuel F - # 2 Diesel Fuel 100% Vol. (Not included in ASTM D471) Fuel G - Fuel D 85% Vol. + Ethanol 15% Vol. Fuel H - Fuel C 85% Vol. + Ethanol 15% Vol. Fuel L - Fuel C 85% Vol. + Methanol 15% Vol. Fuel K - Fuel C 15% Vol. + Methanol 85% Vol. Reference oils - IRM Oils (Industrial Reference Oils) IRM 901 - Low volume increase. IRM 902 - Medium volume increase. IRM 903 - High volume increase. IRM 905 - Very high volume increase. (not included in UNE 53540 and ISO 1817) (formerly called ASTM # 1, 2, 3 and 5) Special liquids 101 - Mix of sebacate of 2-ethylhexyl 99.5% Vol. And phenothiazine 0.5% Vol. 102 - Oil mixture IRM901 95% Vol. And a hydrocarbon oil additive 5% Vol. (29.5-33% Sulfur + 1.5 + 2% Phosphorus + 0.7% Nitrogen) 103 - Tri-n-butyl phosphate |