ASTM D4289 for elastomer compatibility of lubricating greases and fluids
7. Apparatus
7.1 Sample Beaker, heat-resistant glass, Griffin low form, approximately 50 mm in diameter by 70 mm deep (100-mL nominal capacity), having volumetric markings.
7.2 Beaker Cover, disposable, aluminum foil weighing (moisture) dish, with crimped sides and flat, smooth bottom, about 0.1 mm thick, having bottom inside diameter approximately 52 mm and a depth of approximately 14 mm, and a capacity of about 50 mL.
7.3 Analytical Balance, having a sensitivity of at least 1 mg, equipped with a suspension hook and a platform to locate a hydrostatic-weighing beaker above the balance pan.
7.4 Hanger Wire, stainless steel, about 0.5-mm diameter (No. 25 U.S. Steel Wire Gage or Imperial Wire Gage) of suitable length, having a fish-hook configuration, that is, with a suitably sized eye at one end and a hook configuration (approximately 8-mm gape) at the other.
7.5 Coupon Suspension Wire, stainless steel, about 0.71 to 0.72-mm diameter (No. 22 U.S. Steel Wire Gage or Imperial Wire Gage), configured as shown in Fig. 1, to suspend the coupon below the surface of a fluid sample.
7.6 Laboratory Oven, circulating-air type, capable of maintaining the test temperature within6 2.5°C and equipped with one or more grill-type, wire shelves.
7.7 Shore Durometer A, stand-mounted type (see Test Method D2240).
7.8 Coupon Cutting Die, optional, as shown in Fig. 2 (recommended).
8. Reagents and Materials
8.1 Purity of Reagents - It is intended that reagent grade chemicals be used in all tests. Unless otherwise indicated, all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
8.2 Purity of Water - References to water shall be understood to mean distilled or deionized reagent water conforming to the requirements of Specification D1193, Type III.
8.3 Reference Elastomers - Optional, sheets, SAE Aerospace Material Specifications AMS 3217/2B (acrylonitrile-butadiene, NBR-L) and AMS 3217/3A (polychloroprene, CR).
NOTE 6 - Contact ASTM International for information regarding reference elastomer suppliers. When placing purchase orders with suppliers, Reference Elastomers, SAE Specification AMS 3217/2B or AMS 3217/3A, respectively, must be specified to ensure shipment of the proper compound. Orders should require that each slab should be identified with the specification number, including suffix letter, and date of manufacture and should be accompanied by a report of normal inspection data for that batch.
8.3.1 Although the use of SAE Reference Elastomers AMS 3217/2B and AMS 3217/3A is optional in the operation of this test method, when used, they must conform to the requirements of SAE Specifications AMS 3217A, AMS 3217/2B, and AMS 3217/3A, which describes their composition, preparation, and properties. The physical properties used for inspection of these reference elastomers are summarized in Annex A1.
8.3.2 To ensure procurement of the proper compound, purchase orders for Reference Elastomers, SAE Specification AMS 3217/2B or AMS 3217/3A, shall specify that each reference elastomer sheet be identified with the SAE specification number, including the correct sufffix letter (see 8.3 or the lubricant specification), and the date of manufacture, and that the shipment of each batch should be accompanied by a report of normal inspection data for that batch (see Annex A1, for example).
NOTE 7 - Revisions to the parent specification, SAE AMS 3217A, and its collateral specifications, AMS 3217/2B (NBR-L) and AMS 3217/3A (CR), are indicated by changes in the suffix letter. Lubricant specifications should specify the required suffix letter; which may not be the same as that of the most recent version of SAE AMS 3217. Purchasers of reference elastomers should inform suppliers that reference compounds must be exactly as specified and that substitutions are not allowed even if the SAE specification has been updated.
8.4 n-Heptane, reagent grade. (Warning - Flammable. Health hazard.)
8.5 Methanol (Absolute), reagent grade. (Warning - Flammable. Health hazard.)
8.6 Wetting Agent Solution, approximately 0.5 % dioctyl sodium sulfosuccinate, made by a suitable dilution of concentrated solution with reagent water.12 (Warning - Eye irritant.
8.7 Cheesecloth or Gauze Pad, 100 % cotton.
8.8 Blotting Paper, flat, smooth, absorbent filter paper.
8.9 Protective Gloves.
