ASTM D471:2006 pdf free download – Standard Test Method for Rubber Property- Effect of Liquids.
6.1.4 Water—Since the purity of water varies throughout the world, all water immersion tests shall be conducted in distilled or dcionizcd water.
7. Preparation of Speciiiien
7.1 Except as otherwise specified in the applicable specifications, specimens shall be prepared in accordance with the requirements of Practices D 3182 and D 3183.
8. Apparatus
8.1 For non-volatile liquids, a glass test tube, having an outside diameter of 38 mm (1 .5 in.) and an overall length of 300 mm (12 in.) tilted loosely with a stopper (see 8.2.1) shall be used. Glass heads shall be used in the liquid as a bumper and to separate the specimens; refer to 8.3.1.
8.2 For volatile liquids, the test tube described in 8. 1 shall be tightly fitted with a stopper (see 8.2.1) and a reflux condenser. An air-cooled reflux condenser shall be used for ASTM Oils No. 15.6 and No. 5 and for IRM 9025.6 and IRM 9035.6 at test temperatures of 125°C (257°F) or more. This condenser shall be a glass tube, approximately 500 mm (20 in.) or longer, in length and 15 mm (0.6 in.) in outside diameter, tightly fitted to the immersion tube by means of a stopper (see 8.2.1). The bottom of the condenser tube shall project about 12 mm (0.47 in.) below the stopper. A suitable (water-cooled) reflux condenser shall be used for water or other low-boiling liquids. Glass beads shall be used as in 8.1.
8.2.1 The stopper shall not contaminate the test liquid. When in doubt, cover the stopper with aluminum foil.
8.3 Maintaining Test Temperatures—The apparatus and method chosen to maintain the specified temperature during immersion testing varies with test conditions, requirements, and circumstances. Water baths, appropriate temperature transfer oil baths, hot air ovens Note 3, or aging blocks may be used.
NOTE 3—When hot air ovens are used, it should be noted tha
contamination with volatile components of the immersion liquid may occur. This can affect test results, when the same ovens are subsequently used for hot air aging.
8.3.1 The preferred method for elevated-temperature testing is the use of’ aging block ovens (test tube type), as they have the widest temperature capability and arc designed specifically for fluid immersion tests as described in Test Method D 865.
10. Procedure for Change in 1Iass
10.1 Test three specimens of a single composition. Calculate the test results of the three specimens (see 17.1. Eq 1) and average the results. Weigh each specimen in air to the nearest 1 mg, record the mass as M1, and immerse in the test tube (see 8.1) containing 100 cm3 of the test liquid (see 10.1 .1). Separate each test specimen from any adjacent test specimen and the walls of the test tube by approximately 6 mm (0.25 in.).