1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2010 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J2236_201009SURFACEVEHICLESTANDARDJ2236 SEP2010 Issued 1992-06 Revised 2010-09Superseding J2236
5、 MAY1999 Standard Method for Determining Continuous Upper Temperature Resistance of Elastomers RATIONALE Revisions are editorial to clarify the use of Die C per ASTM D 412, and to replace references to SAE J3000 with SAE J2558. Testing requirements are increased from five batches to six batches to o
6、btain a statistically valid sample size of 30 specimens in total. 1. SCOPE This method is intended to define the continuous upper temperature resistance (CUTR) of thermoplastic elastomers and thermoset rubber with durometer hardness =90 Shore A, to oxidation or other degradation when exposed solely
7、to hot air for an extended period of time. 1.1 This method established the upper thermal aging limits of commercially available compounds as measured at 23 C by retention of at least 50% original elongation and tensile at break after 1008 h of heat aging. This method does not take into account nor m
8、easure the effects of stress, environment, or temperature variations on the thermal aging characteristics of the materials tested. 1.2 This method may involve hazardous materials, operations, and equipment. This SAE Standard does not address the safety problems associated with its use. It is the res
9、ponsibility of the user of this document to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.3 This test method is based on SI units. 2. REFERENCES 2.1 Applicable Documents The following publications form a part o
10、f this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. SAE J2236 Revised SEP2010 Page 2 of 52.1.1 SAE Publications Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Cana
11、da) or 724-776-4970 (outside USA), www.sae.org.SAE J200 Classification System for Rubber Materials SAE J1344 Marking of Plastic Parts SAE J2332 Marking of Rubber Parts SAE J2558 Classification System for Thermoplastic Elastomers 2.1.2 ASTM Publications Available from ASTM International, 100 Barr Har
12、bor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM D 412 Standard Test Methods for Rubber Properties in Tension, Method A ASTM D 573 Standard Test Method for RubberDeterioration in an Air Oven ASTM D 1418 Standard Practice for Rubber and Rubber LatticesN
13、omenclature ASTM D 1972 Practice for Generic Marking of Plastic Products ASTM D 2240 Standard Test Method for Rubber PropertyDurometer Hardness 3. TERMS SPECIFIC TO THIS STANDARD 3.1 CONTINUOUS UPPER TEMPERATURE LIMIT (CUTL) The temperature at which the material retains a 50% minimum of both the ori
14、ginal elongation and tensile at break after 1008 h in an air circulating oven per ASTM D 573, Type IIA or IIB. Note per ASTM D 573: Type IIB ovens are not suitable for test temperatures above 70 C. 3.2 TEST METHOD A definitive procedure for identification, measurement, and evaluation of one or more
15、qualities, characteristics, or properties of a material, product system, or service that produces a test result. 3.3 PRODUCTION COMPOUND An identifiable, homogeneous quantity of material from a standard production period with a consistency and properties demonstrated through testing and use. 3.4 COM
16、MERCIAL MATERIAL A finished compound developed primarily, but not exclusively, for heat resistance from readily available ingredients and processed on conventional industry equipment. SAE J2236 Revised SEP2010 Page 3 of 54. SIGNIFICANCE AND USE 4.1 Data obtained by this method are applicable to the
17、material under conditions of this test and are not necessarily the same as those obtained in end use applications. The information may be used for comparison, selection, or qualification of commercially available compounds where a level of proficiency is desired beyond short time quality control tes
18、ts. 4.2 Ultimate elongation was selected over other physical property measurements because of its greater sensitivity to the various effects of air oven aging on elastomers. Tensile strength is also used since some compounds maintain more than 50% of their original elongation while losing considerab
19、le tensile strength after heat aging. 4.3 A material classification CUTL represents the highest temperature value the compound(s) can achieve per Table A1 guidelines (see Appendix A). The materials are classified according to ASTM D 1418, ASTM D 1972, or SAE J1344. Not all compounds within a materia
20、l category can reach the listed maximum temperature. 4.4 This document requires aging at elevated temperatures in a hot air circulating oven per ASTM D 573, regardless of what is used in SAE J200. Care must be taken to test only similar generic compounds (i.e., silicone to silicone) in order to avoi
21、d cross contamination from volatile products and subsequent variation in test data. 5. GENERAL TEST CONDITIONS 5.1 Unless otherwise specified, the material shall be tested to ASTM D 412 Die C, Method A requirements at 23 C. 5.2 Aging Temperatures Variation around a specified temperature shall be wit
22、hin 2 C. 5.3 Aging Temperature Increments Unless otherwise specified, test new materials (per SAE J200 Table 1, plus 135 C and 165 C) to establish the upper continuous temperature limit to the definition in 3.1. Material tables shall be established using this criterion to minimize testing burden. 5.
23、4 Aging Time 1008 h 2 h 5.5 Uniform Aging Conditions Tests of samples shall ensure that all surfaces be exposed and the temperature uniform. 6. SAMPLE REQUIREMENTS 6.1 Thermoplastic elastomer and thermoset rubber elongation and tensile at break data used to establish tables or qualify new materials
24、shall be the median of a minimum of five samples per batch from six different batches. 6.2 Sample Dimensions for Thermoset Rubber Follow ASTM D 412 requirements using Die C. SAE J2236 Revised SEP2010 Page 4 of 56.3 Thermoplastic Elastomers (from SAE J2558) Unless otherwise noted, samples are to be d
25、ie cut from injection molded rectangular plaques 2.0 mm 0.4 mm thick. Specimens of other thickness will not necessarily give comparable results. Plaque dimensions must be sufficient to permit this. Five samples are to be tested in the direction of highest tensile strength and the median value is rep
26、orted for both elongation and tensile at break. 6.4 Certain elastomers may require post curing or other conditions to achieve optimum heat resistance properties. 7. TABLE REQUIREMENTS 7.1 The material heat resistance table (Table A1) in the appendix shall be developed using temperatures from SAE J20
27、0 Table 1, and additional temperatures (135 C and 165 C) appropriate to industry needs. If a material meets a temperature requirements, it is presumed that it will meet all lower temperatures. 7.2 Test commercially available compounds to Section 5 conditions for 1008 h. Determine the percent elongat
28、ion and tensile at break prior to and immediately after the test period per ASTM D 412 Die C for thermoset and thermoplastic materials with durometer hardness of 90 Shore A hardness or less. 7.3 Test at 23 C and report results for the number of samples stated in 6.1 and 6.3 per ASTM D 412 Die C. 7.4
29、 A material will qualify for inclusion in the temperature classification table (Table A1) when test data satisfies the requirements of 3.1. 8. PRECISION AND BIAS 8.1 No precision statement exists for 1008 h oven aging per ASTM D 573. See ASTM D 573 for the precision of oven aging after 48 and 96 h a
30、nd ASTM D 412 for precision of tensile testing. 9. NOTES 9.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the
31、 left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE COMMITTEE ON AUTOMOTIVE RUBBER SPECIFICATIONS SAE J2236 Revis
32、ed SEP2010 Page 5 of 5APPENDIX A - TABLE A1 FORMAT REQUIREMENTS (MANDATORY INFORMATION) A.1 TABLE A1 REQUIREMENTS a. To qualify for a temperature type, the material must be a commercially available material, developed primarily, but not exclusively for heat resistance. Rubber materials listed in Tab
33、le A1 are not blends, they contain 100% of the designated polymer. This does not apply to TPEs which are often blends or multi-phase materials. b. In order to appear on the table, a material must have an ASTM D 1418, ASTM D 1600, ASTM D 1972, or SAE J1344 nomenclature designation. If a TPE materials
34、 nomenclature is designated by more than one code, SAE J1344 shall be the preferred usage code and the additional material designation code shall be listed in Table A1 in parenthesis ( ). 1. A prospective compound must meet or have a current SAE J200 or SAE J2558 type and class designation. c. To me
35、et the temperature type defined by Table A1, the materials elongation and tensile strength must retain a minimum of 50% of the original values after 1008 h at that temperature. The temperature classification of a material is based on the median of test results obtained from a minimum of five samples
36、 from each of six different batches (see 6.1) from one laboratory. Labs submitting data need not be accredited (see A.1.d.(2). d. Challenges to test results will be handled as follows: 1. Labs or companies wanting to verify test results should make a written request to SAE CARS. 2. SAE CARS will req
37、uest the compound originator to send samples, or may take custody of the samples for distribution, to two designated independent, third party labs. The labs must be accredited by a recognized firm such as the American Association of Laboratory Accreditation or Standards Council of Canada. Disclosure
38、 of the labs is at the discretion of SAE CARS. 3. Sample testing will be paid for by the challenger. The challenger cannot access the material directly, nor request material left over from the third party testing. 4. The challenger and SAE CARS will receive the test results and render a decision. 5.
39、 CARS will be the final arbiter of any disputes and decisions. e. Thermoplastic Elastomer (TPE) temperature selection is based on the median in the direction of highest tensile strength (see 6.3). Please report all data points, along with the median values. f. Table temperatures are 70 C, 100 C, 125
40、 C, 135 C, 150 C, 165 C, 175 C, 200 C, 225 C, 250 C, and 275 C. TABLE A1 - CUTL OF ELASTOMERS Nomenclature/Classification Temperature C Rubber IR, NR, SBR 70 IIR, CR 100 BIIR, CIIR, CO, ECO, NBR 125 ACM, AEM, EPDM, EVM, HNBR(1)150 VMQ 175 FKM 225 Thermoplastic Elastomers (=90A) TEO, TES 135 1. Degree of saturation must be 96% or more.
