UL 510-2020 pdf download – Polyvinyl Chloride, Polyethylene, and Rubber Insulating Tape.
4.3 Unless otherwise specified, all testing, except flammability, shall be conducted at 23 ±5°C (73 ±9°F) and a relative humidity of 50 ±10%. Flammability testing shall be conducted in still air at a temperature of 15 – 35°C (59 – 95°F) and a relative humidity of < 75%. All samples shall be preconditioned at 23 ±5°C (73 ±9°F) and a relative humidity of 50 ±10% for a minimum of 30 minutes prior to test, or referred to as the As-Received condition. 4.4 Unless otherwise indicated for a specific test, testing of each construction in the unpigmented and heaviest pigmented dark and light tapes (such as black and white) are considered to represent the range of colors for each test. If the tape is produced with the pigment in different layers, such as the backing, reinforcement and/or adhesive, each of those unique constructions will also require the applicable tests described within this standard. 4.5 Each tape shall be considered a unique construction if the thickness of any individual layer varies by more than 10%. 4.6 Unless otherwise specified in the individual test method, the average of the results for the specimens tested shall be used to determine compliance with the requirements of this standard. 4.7 Unless otherwise specified in the individual test method, tensile strength and elongation results for specimens that break at some obvious flaw or that do not break between the predetermined bench marks shall be discarded. 5 Flame Test 5.1 Insulating tape marked “Flame Retardant” in accordance with 23.2 shall not flame longer than 60 seconds following any of five 15 seconds applications of the test flame, the period between applications being: a) 15 seconds if the specimen flaming ceases within 15 seconds; or b) The duration of the specimen flaming if the specimen flaming persists longer than 15 seconds.
5.2 The tape shall not ignite combustible materials in its vicinity or damage more than 25% of the indicator flag during, between, or after the five applications of the test flame. The test shall be conducted as described in 5.4 – 5.15. 5.3 The testing of the 19 mm (0.75 inch) specimen width is considered representative of the performance of all sizes (widths) of the tape. Sample set of three specimens shall be tested. 5.4 The test specimen is to be prepared as follows. A straight clean steel rod 460 mm (18 inches) long and 3.2 mm (0.125 inch) in diameter is to be supported in a winding jig. The winding jig is to support the rod at each end and have a crank for rotating the rod so that the tape can be wound thereon. The winding jig is to be attached to a rigid support in such a manner that it can be rotated, tilting the major axis of the rod to the horizontal. A 900 mm (3 feet) length of 19 mm (0.75 inch) tape is to be cut from a roll. The tape sample is to be secured, by overlapping the first turn of tape, to the rod held in a horizontal position. A weight exerting 2.0 kgf (4.4 lbf) is then to be attached to the free end of the 900 mm (3 feet) sample to provide tension.