1. Scope

1.1 These test methods cover the procedure for measuring physical properties of elastomer seals in the form of O-rings after exposure to industrial hydraulic fluids and thermal aging. The measured properties are then compared to the physical properties of elastomer seals that have not been exposed to the industrial hydraulic fluids and thermal aging. The changes in these properties form a basis for assessing compatibility when these changes are compared against the suggested limits in .

1.2 While these test methods involve the use of O-rings, they can also be used to evaluate the compatibility of the elastomeric compounds of specialty seals with industrial hydraulic fluids and their resistance to thermal aging. The compounds can be molded into O-rings for evaluation purposes.

1.3 These test methods provide procedures for exposing O-ring test specimens to industrial hydraulic fluids under definite conditions of temperature and time. The resulting deterioration of the O-ring material is determined by comparing the changes in work function, hardness, physical properties, compression set, and seal volume after immersion in the test fluid to the pre-immersion values.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This test method covers the determination of the cure state of elastomers by DSC. It is based on Test Method D 5028. This test method is applicable to elastomers with adequate vulcanizers. The normal operating temperature range is from room temperature to 250C (482F), but not limited to such. All elastomers should be fully cured.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D395 Test Methods for Rubber Property--Compression Set

D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers--Tension

D471 Test Method for Rubber Property--Effect of Liquids

D1414 Test Methods for Rubber O-Rings

D2000 Classification System for Rubber Products in Automotive Applications

D2240 Test Method for Rubber Property--Durometer Hardness

D3677 Test Methods for Rubber--Identification by Infrared Spectrophotometry

D3767 Practice for Rubber--Measurement of Dimensions

D5028 Test Method for Curing Properties of Pultrusion Resins by Thermal Analysis

E1131 Test Method for Compositional Analysis by Thermogravimetry

SAE Standard

Keywords

compatibility; density; elastomer seal; elongation; fluid aging; hardness; industrial hydraulic fluid; O-ring; tensile strength; volume shrinkage; volume swell; work function; Compatibility--sealants; Elastomeric seals/sealants; Elongation; Fluid aging; Hardness; Hydraulic fluids/oils; O-rings; Tensile properties/testing--petroleum products; Volume shrinkage; Workability qualities/characteristics;

ICS Code

ICS Number Code 83.140.50 (Seals)

DOI: 10.1520/D6546-00R05

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