FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 242 of 460

FED-STD-791D

Method 3603.5

September 30, 1986

SWELLING OF SYNTHETIC RUBBERS

1. SCOPE

1.1 This method is used for determining the effect of petroleum products on

synthetic rubber.

2. SUMMARY

2.1 The test consists of determining the volume of three standardized test rubber

sheets by water displacement, storing them immersed in the sample for 168 h at 70�C,

then determining the average change in volume of the sheets.

3. SAMPLE SIZE

3.1 For liquid products: Approximately 300 mL of the liquid to be tested.

3.2 For greases: Approximately 400 g of grease to be tested.

4. REFERENCE, STANDARDS, AND APPARATUS

4.1 Container, heat-resistant, consisting of:

a. For liquid sample: Test tube, 5 cm O.D. by 40 cm long. A graduated

cylinder with these dimensions may be used provided it doesn't have a pouring

spout.

b. For grease sample: Petri dish, 10 cm O.D. by 5 cm deep with cover

(watch glass).

4.2 Balance, sensitivity "1 mg, suitable for weighing in both air and water.

4.3 Oven, gravity-convention, 70� " 1�C (158� " 2�F).

4.4 Spatula (for grease sample).

5. MATERIALS

5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The

chemical materials listed in this section must be handled carefully. Federal Test Method

10000, Material Handling Safety Precautions, is a reference which lists all toxic and

hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,

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