UL 569-2013 pdf download

UL 569-2013 pdf download.Pigtails and Flexible Hose Connectors for LP-Gas.
19 Adhesion Test
19.1 General
19.1.1 For 3/8-inch (9.5 mm) size hose and smaller, the adhesion between the cover and the reinforcement, between the tube and the fabric reinforcements, and between the plies of fabric reinforcement shall be such that the rate of separation of a ring-shaped specimen, 1 inch (25.4 mm) in width, is not greater than 1 inch per minute (0.42 mm/S) with a weght of 8 pounds (3.6 kg) for the adhesion determinations between the cover and the reinforcements and between the tube and reinforcement and with a weight of 10 pounds (4.5 kg) for the adhesion determination between the plies of reinforcement.
19.1.2 For sizes of hose greater than 3/8 inch (9.5 mm). the adhesion between the cover and the reinforcement, between the tube and the fabric reinforcement, and between the plies of fabric reinforcement shall be such that the rate of separation of a ring-shaped specimen, 1 inch (25.4 mm) in width, is not greater than 1 inch per minute (0.42 mrn!s) with a weight of 10 pounds (4.5 kg).
19,1,3 The adhesion between wire reinforcements and between the tube and a wire reinforcement shall be such that adjacent reinforcements, and the tube and the wire reinforcement, adhere firmly to each other by means of a compound impregnated in the reinforcements.
19.1.4 The above adhesion requirement is not intended for light fabric braids imbedded in or vulcanized to the rubber cover or tube for the primary purpose of improving the adhesion between the cover or tube and reinforcement.
19.2 Apparatus
19.2.1 Adhesion tests are to be conducted with the type of apparatus described for the Static Mass Method in ASTM 0413—82(1993), Test Method Rubber Properly—Adhesion to Flexible Substrate.
19.3 Method
19.3.1 The tests are to be conducted in accordance with the test methods outlined in ASTM D380—87, Method of Testing Rubber Hose, Adhesion tests are to be conducted on only the cover of wire-reinforced hose. A hack saw with a sharp, fine (24 teeth/inch) blade has been found acceptable for hose having a wire braided reinforcement, but a band saw with a fine blade gives cleaner edges and is preferable for preparing the ring specimens. The adhesion is to be taken as the rate obtained by dividing the total distance separated in inches (mm). to the nearest 1132 inch (0.8 mm), by the elapsed time in minutes.
19.3.2 When the adhesion of the reinforcement to the tube or cover is such that the parts cannot be separated sufficiently to permit attachment of the clamp, the adhesion is considered to be in compliance with the requirements.
20.3 Method
20.3.1 A 0,5 meter (1.6 11) coupled length of hose is to be tested in accordance with the procedure outlined in ASTM 03902-90. The hose is to be tested with LP-Gas in the liquid phase.
21 Ozone Exposure Test
21.1 The rubber cover or impregnated outer braid of a flexible hose connector shall show no visible signs of cracking when stressed and then exposed for 70 hours to an atmosphere containing 100 parts per hundred million (pphrn) of ozone at a temperature of 40°C (104°F).
21.2 The ozone test chamber for this test Is to comply with the requirements outlMed in the Method of Test for Accelerated Ozone Cracking of Vulcanized Rubber. ASTM Dli 49-91. The specimen holder is to comply with the requirements outlined in Procedure B of the Method of Test for Resistance to Surface Cracking of Stretch Rubber Compounds, ASTM D518-86(1991).
21.3 Three specimens, 3-3/4 inches (95.3 mm) long and 1 inch (25.4 mm) wide, are to be Cut longitudinally from the rubber cover or Impregnated outer braid of the hose sample and mounted in the specimen holder in a looped position, in accordance with the procedures outlined in the Method of Test for Accelerated Ozone Cracking of Vulcanized Rubber, ASTM 0518-86(1991), Procedure B. The mounted specimens are to be allowed to remain In an ozone free atmosphere for 24 hours. They are then to be placed in the ozone test chamber, which is to be regulated to produce an ozone concentration of 100 pphm and a constant temperature of 40°C (104°F). The mounted specimens are to remain in the ozone test chamber for 70 hours. After the test exposure, the specimens are to be removed from the test chamber and examined for evidence of cracking with a hand magnifying glass of seven power magnification.