Craig:
I don’t believe that there is an official reference to ASTM standards in either UL 60950-22, First Edition/CSA C22.2 No. 60950-22-07, nor UL 50E, First Edition/CSA C22.2 No. 94.2-07/NMX-J-235/2-ANCE-2007. However, if you are looking to set up to do this test, I have done so, it was not hard to do, and I have gotten the gasket compression test added to my lab’s NRTL data acceptance programs for several NRTLs. You need the following: 1. Scale 2. Temperature chamber 3. Three (3) stainless steel disks, 100 mm/4 inches diameter, 75 mm/3 inches high 4. Three (3) stainless steel plates to rest gasket on, dimensioned as shown in Annex D of UL 60950-22/CSA C22.2 No. 60950-22-07/IEC 60950-22/EN 60950-22. (I use stainless, though the standard says galvanized or painted steel, and I have not had a problem). 5. Barbell weights from local sports equipment store, enough for three (3) sets, to pick up bulk of weight between that of the disks and 18 kg (37.9 lbs). You can try to get closer to the correct mass with the disks, based on material density, if you know it (I am not in my office today, so I cannot weigh the disks today). 6. 3 Miscellaneous weight kits, 2 kg and smaller, to get the exact weight of 18 kg. I have boxes with the weights that look like milk jugs. 7. A 3 pound (1.35 kg) steel hammer with the circular face 28,6 mm (1 ¼ inch) diameter and a circular striking face of 25.4 mm (1 inch). I found a 3-pound hammer with a striking face slightly larger. The hammer can be built onto a fixture of clear spruce (below). 8. A clear spruce (pine) wooden 2x4 (50 mm by 100 mm). Look at the mill marks at the lumber store. (We had a board lying around) 9. Miscellaneous wood and screws to create a fixture to hang the gaskets in the temperatures, and to pivot the hammer. The hammer can be secured to the clear spruce striking surface with a bolt secured to two pieces of wood, each attached to the clear spruce striking surface. Use a drill press or a steady hand to drill a hole in the handle of the hammer so that it swings down and strikes the clear spruce striking surface on the flat part of the face. Best Regards, Don Gies, N.C.E Senior Product Compliance Engineer Alcatel-Lucent Murray Hill, NJ 07974-0636 USA ________________________________ From: Petrie, Craig D [mailto:[email protected]] Sent: Friday, September 04, 2009 7:51 AM To: [email protected] Subject: Gasket testing (Outdoor ITE) Good afternoon all, Does anyone know if any of the ASTM standards cover the same test as IEC/UL/CSA 60950-22 Cl. 8.5 Annex D.3 Compression Test and CSA No. 94-M91 Cl. 6.2.5 Gasket Test below: The set of specimens of gasket material shall be tested to the requirements of a), b) and c) (see Figure D.1). On completion of each test, the specimens shall not show signs of deterioration or cracks that can be seen with normal or corrected vision. a) A cylindrical weight sufficient to apply 69 kPa shall be placed on the middle portion of each specimen for a period of 2 h. At the end of that time the weight shall be removed and the specimen allowed to rest at a room temperature of 25 °C * 3 °C for 30 min. The thickness of the gasket shall then be determined and compared with a measurement obtained before the application of the weight. The compression set shall not exceed 50 % of the initial thickness of the specimen. b) Following the test specified in a), the same specimens shall be suspended in an air oven at a temperature of 70° C for a period of 5 days. The specimens shall then be tested for compliance with a), approximately 24 h after removal from the oven. c) Following the test specified in b), the specimens shall be cooled to a temperature of -30 °C for a period of 24 h and then subjected to an impact >from a hammer of 1,35 kg mass falling from a height of 150 mm upon removal from the cold chamber. The hammer head shall be steel, 28,6 mm in diameter and have a flat striking surface, 25,4 mm in diameter with slightly rounded edges. The specimens being tested shall be placed on short lengths of 50 mm by 100 mm minimum wooden pieces (clear spruce) when being impacted. Following the impact the specimens shall be examined for evidence of cracking or other adverse effects. The test shall be continued and the specimens impacted every 24 h for two more days. The specimens shall then be removed from the cold chamber, allowed to rest at a room temperature of 25 °C * 3 °C for approximately 24 h, and then again tested for compliance with a). On reviewing numerous gasket data sheets, there is a lot of references to ASTM D1056 and ASTM D746 listed. It appears these may be similar tests. Can you anyone confirm/deny or provide more information? Any advice is much appreciated. Regards, Craig - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
