Ul 746b pdf

Ul 746b pdf

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5+ r: 02aug] previous standard id: polymeric materials - long term property evaluations [ ul 746b: ed. 0e+ 16 ohms· cm 125° c 1. polymeric materials, short- term property evaluations. box 25 11 north canton, ohunited states of america. polymeric materials, long- term property evaluations. listing of ul 746 series testing performed by the world leader ul 746b pdf in electrical testing, eltek international laboratories. summary of properties. final classification when testing ul 94v or 5v in ul 94 ( proposal) 4. clarification for hb test in ul 94. these cabinets were developed in close cooperation with the manufacturer to guarantee maximum precision and reproducibility. hot- air aging in a load- free state. ) when pdf exposed to elevated temperatures for an extended period of time. to arrange ul 746a and ul 746b testing of polymeric materials, request a quote online now or call. four temperatures at a minimum are to be selected. together with the standards mentioned in supplementary test procedures, section 3, these investigations provide data with respect to the physical, electrical, flammability, thermal, and. tests for flammability of plastic materials for parts in devices and appliances. all our hot- air cabinets are measured and monitored. the polymer is highly inert, making it resistant to a variety of acids, bases, solvents, staining agents, and hydrolysis. the publication of revised pages or a new edition of this standard will not. 5+ r: 18apr] effective date: decem. standard: ul 746b standard id: polymeric materials - long term property evaluations [ ul 746b: ed. 相對溫度等級 ( relative thermal index, rti) 是 ul 針對高性能塑料認證的重要參數之一, 可獲知材料在特定溫度與長時間應用下, 展現的機械強度與絕緣特性耐受力; 其亦為終端產品選料的重要依據。. how do you choose ul 746b rti test temperatures? clamp design for vertical flame test specified in ul 94. tedlar® pvf films are made from polyvinyl fluoride homopolymer, with structure shown in figure 1. t4 = 100° c, t3 = 110° c, t2 = 120° c, t1 = 130° c. ul solutions has more than 150 hot- air cabinets for thermal aging and determining the rti ( relative temperature index) of a material. document history. 0e+ 9 ohms· cm dielectric strength iec. the following standards are directly related to the evaluation of polymeric materials. ul copyrighted material not authorized for further reproduction or distribution without permission from ul ul standard for safety for polymeric materials long term property evaluations, ul 746b fourth edition, dated ap summary of topics this revision of the fourth edition of ansi/ ul 746b was issued to incorporate the following. 3 of ul 94 for testing thicknesses less than 3. t3, t2 and t1 are higher than t4 by increasing by at least 10° c per interval but are below the melting temperature of the material, ex. what does the specialized ltta method for polymer variation mean? this document outlines a process for adding equivalent substitute insulation materials to a company’ s ul section general or their approved materials list for their manufactured end product based on the logic found in ul 746 and ul 1446. a tabulation of the temperature indices according to the generic material class is included in ul 746b and is based on the past field- test performance and chemical structure. approved as ansi/ ul 746b- 1980, novem approved as ansi/ ul 746b- 1986, janu approved as ansi/ ul 746b- 1992, aug approved as ansi/ ul 746b- 1997, decem the department of defense ( dod) has adopted ul 746b on novem. ul 746b | ul standards & engagement | ul standard | edition 5 | polymeric materials - long term property evaluations | published date: aug | ansi approved: febru. t4 is the desired rti. e- mail com internet www. ul standard for safety polymeric materials – long term property evaluations. together with the standards mentioned. for each material, a number of relative thermal indices can be established. 0 kv/ mm dielectric constant iec° c, 50 hz 3. it is a measure of the material’ s thermal endurance. these requirements cover long- term test procedures to be used for the evaluation of materials used for parts intended for specific applications in end products. drm protected documents ×. it does not absorb visible or uv light substantially and is highly resistant to photolytic degradation. ul 746b standard for polymeric materials - long term property evaluations ul red line edition 5 published date: decem last revision: febru. the corona resistance of kapton® 100crc film provides improved service life and operational eficiencies beyond that of conventional insulation materials. ul 94 foam material testing ( hbf/ hf- 1/ hf- 2) : inclusion of density value in section 12. interpretation of paragraph 7. a relative thermal index of a material is an indication of the material’ s ability to retain a particular property ( physical, electrical, etc. some pdf files are. ul 746 is divided into several parts, each focusing on different aspects of material testing and evaluation: ul 746a: standard for polymeric materials – short term property evaluations. the screening test is very helpful in determining which may be the preferred sampling technique. in addition to the corona resistant properties, kapton. documents sold on the ansi webstore are in electronic adobe acrobat pdf format. 0e+ 15 ohms· cm 275° c 1. rti elec 260 ° c ul 746b rti imp 180 ° c ul 746b rti str 240 ° c ul 746b electr ical nominal value unit test method volume resistivity iec° c 1. how do you select ul 746b rti. this process logic can apply to ansi and ieee standards that reference ul standards 746 and/ or ul 1446. duponttm kapton® corona resistant film is a state of the art polyimide film that withstands the damaging effects of corona discharge. while ul 746a and ul 746b cover standard test methods for short term and long- term evaluation, the other ul 746 standards address specific types of applications. ul 746b standard for polymeric materials - long term property evaluations ul revision ul 746b pdf edition 5 published date: janu last revision: febru. 由於 rti 評估涉及長時間老化程序 ( long term thermal aging, ltta), 測試耗日費時.