AATCC 118-2002 Oil Repellency: Hydrocarbon Resistance Test.
5. Uses and Limitations
5.1 This test method is not intended to give an absolute measure of the resis- tance of the fabric to staining by all oily materials. Other factors, such as compo- sition and viscosity of the oily sub- stances, fabric construction, fiber type, dyes, other finishing agents, etc., also influence stain resistance. This test can, however, provide a rough index of oil stain resistance, in that generally the higher the oil repellency grade, the better resistance to staining by oily materials, especially liquid oil substances. This is particularly true when comparing various finishes for a given fabric. 6. Apparatus and Materials
6.1 Test liquids prepared and numbered according to Table I (see 12.2). 6.2 Dropping bottles (see 12.3).
6.3 White AATCC Textile Blotting Paper (see 12.4).
6.4 Laboratory gloves (general purpose is sufficient).
7. Test Specimens
7.1 Test two specimens approximately 20 × 20 cm (8 × 8 in.) from each sample. Condition the test specimens for a mini- mum of 4 h at 21 ± 1°C (70 ± 2°F) and 65 ± 2% RH prior to testing.
8.1 Place the test specimen flat on the white textile blotting paper on a smooth, horizontal surface.
8.1.1 When evaluating open weave of “thin” fabrics, conduct the test on at least two layers of the fabric; otherwise, the test liquid may wet the underlying sur- face, not the actual test fabric, and thereby cause confusion in the reading of the results.
8.1.2 Equipment, benches and gloves must be free of silicone. Use of silicone containing products could adversely af- fect the oil repellency grade.
8.2 Wearing clean laboratory gloves, brush the pile of napped or pile fabrics with your hand in the direction giving the greatest lay of the surface prior to placing the drops of the test liquid.
8.3 Beginning with the lowest-numbered test liquid (AATCC Oil Test Grade Liquid No. 1), carefully place small drops [approximately 5 mm (0.187 in.) in diameter or 0.05 mL volume] on the test specimen in five locations along the filling direction. The drops should be approximately 4.0 cm (1.5 in.) apart. The dropper tip should be held at a height of approximately 0.6 cm (0.25 in.) from the fabric surface while placing drops. DO NOT TOUCH THE FABRIC WITH THE DROPPER TIP. Observe the drops for 30 ± 2 s, from approximately a 45° angle.
8.4 If no penetration or wetting of the fabric at the liquid-fabric interface and no wicking around the drops occur, place drops of the next higher-numbered test liquid at an adjacent site on the fabric and again observe for 30 ± 2 s. 8.5 Continue this procedure until one of the test liquids shows obvious wetting or wicking of the fabric under or around the drop within 30 ± 2 s.AATCC 118 pdf download.