ASTM D7216 - 13

    Standard Test Method for Determining Automotive Engine Oil Compatibility with Typical Seal Elastomers

    Active Standard ASTM D7216 | Developed by Subcommittee: D02.B0.07

    Book of Standards Volume: 05.04


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    Significance and Use

    5.1 Some engine oil formulations have been shown to lack compatibility with certain elastomers used for seals in automotive engines. These deleterious effects on the elastomer are greatest with new engine oils (that is, oils that have not been exposed to an engine’s operating environment) and when the exposure is at elevated temperatures.

    5.2 This test method requires that non-reference oil(s) be tested in parallel with a reference oil, TMC 1006-1, known to be aggressive for some parameters under service conditions. This relative compatibility permits decisions on the anticipated or predicted performance of the non-reference oil in service.

    5.3 Elastomer materials can show significant variation in physical properties, not only from batch-to-batch but also within a sheet and from sheet-to-sheet. Results obtained with the reference oil are submitted by the test laboratories to the TMC to allow it to update continually the total and within-laboratory standard deviation estimates. These estimates, therefore, incorporate effects of variations in the properties of the reference elastomers on the test variability.

    5.4 This test method is suitable for specification compliance testing, quality control, referee testing, and research and development.

    5.5 The reference elastomers, reference oil and the physical properties involved in this test method address the specific requirements of engine oils. Although other tests exist for compatibility of elastomers with liquids, these are considered too generalized for engine oils.

    1. Scope

    1.1 This test method covers quantitative procedures for the evaluation of the compatibility of automotive engine oils with several reference elastomers typical of those used in the sealing materials in contact with these oils. Compatibility is evaluated by determining the changes in volume, Durometer A hardness and tensile properties when the elastomer specimens are immersed in the oil for a specified time and temperature.

    1.2 Effective sealing action requires that the physical properties of elastomers used for any seal have a high level of resistance to the liquid or oil in which they are immersed. When such a high level of resistance exists, the elastomer is said to be compatible with the liquid or oil.

    Note 1The user of this test method should be proficient in the use of Test Methods D412 (tensile properties), D471 (effect of rubber immersion in liquids), D2240 (Durometer hardness), and D5662 (gear oil compatibility with typical oil seal elastomers), all of which are involved in the execution of the operations of this test method.

    1.3 This test method provides a preliminary or first order evaluation of oil/elastomer compatibility only. Because seals might be subjected to static or dynamic loads, or both, and they can operate over a range of conditions, a complete evaluation of the potential sealing performance of any elastomer-oil combination in any service condition usually requires tests additional to those described in this test method.

    1.4 The several reference elastomer formulations specified in this test method were chosen to be representative of those used in both heavy-duty diesel engines and passenger-car spark-ignition engines (the latter are covered in Annex A2). The procedures described in this test method can, however, also be used to evaluate the compatibility of automotive engine oils with different elastomer types/formulations or different test durations and temperatures to those employed in this test method.

    Note 2In such cases, the precision and bias statement in Section 12 does not apply. In addition to agreeing acceptable limits of precision, where relevant, the user and supplier should also agree: (1) test temperatures and immersion times to be used; (2) the formulations and typical properties of the elastomers; and (3) the sourcing and quality control of the elastomer sheets.
    Note 3The TMC may also issue Information Letters on this matter.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.6 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.

    1.7 This test method is arranged as follows:

     

    Section

    Scope

    1

    Referenced Documents

    2

    Terminology

    3

    Summary of Test Method

    4

    Significance and Use

    5

    Apparatus

    6

    Reference Materials

    7

    Procedure

    8

    Calculations

    9

    TMC 1006-1 Reference Oil

    10

    Report

    11

    Precision and Bias

    12

    Keywords

    13

    Formulations and Physical Properties for Reference Elastomers Typically Used in Heavy-Duty Diesel Engines

    Annex A1

    Test Procedure for Reference Elastomers Typically Used in Spark-Ignition Engines

    Annex A2



    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

    D297 Test Methods for Rubber Products--Chemical Analysis

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

    D471 Test Method for Rubber Property--Effect of Liquids

    D1193 Specification for Reagent Water

    D1566 Terminology Relating to Rubber

    D2240 Test Method for Rubber Property--Durometer Hardness

    D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants

    D4485 Specification for Performance of Active API Service Category Engine Oils

    D5662 Test Method for Determining Automotive Gear Oil Compatibility with Typical Oil Seal Elastomers

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E178 Practice for Dealing With Outlying Observations

    SAE Standard

    SAEJ2643 Standard Reference Elastomers (SRE) for Characterizing the Effect of Liquids on Vulcanized Rubbers


    ICS Code

    ICS Number Code 75.100 (Lubricants, industrial oils and related products)

    UNSPSC Code

    UNSPSC Code 15121501(Engine oil)


    Referencing This Standard

    DOI: 10.1520/D7216

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D7216-13, Standard Test Method for Determining Automotive Engine Oil Compatibility with Typical Seal Elastomers, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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