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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2643_201312 SURFACE VEHICLE STANDARD J2643 DEC2013 Issued 2004-08 Revised 2013-1
5、2 Superseding J2643 AUG2004 Standard Reference Elastomers (SRE) for Characterizing the Effect of Liquids on Vulcanized Rubbers RATIONALE This standard is modified to add a few more Standard Reference Compounds, in order to enhance the portfolio on FKM, AEM and ACM reflecting advancements in elastome
6、r technology. FOREWORD The development of these standard reference elastomers (SRE) is based on static and dynamic engine oil sealing applications for passenger cars and light duty trucks. 1. SCOPE This SAE Standard specifies requirements for vulcanized rubbers in sheet form for use as standards in
7、characterizing the effect of test liquids and service fluids. The annexes contain the standard reference elastomer formulas. The property changes of the SRE in contact with the indicated fluid under specified test conditions are the responsibility of the user. See 7.3 and Table 1. This standard is n
8、ot designed to provide formulations of elastomeric product compositions for actual service. 1.1 Safety This standard may involve hazardous materials, operations and equipment. It does not address the safety concerns which may be associated with its use. It is the responsibility of any user of this s
9、tandard to consult and establish appropriate health and safety practices, and determine the applicability of regulatory limitations before use. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicat
10、ed, the latest issue of SAE publications shall apply. SAE INTERNATIONAL J2643 Revised DEC2013 Page 2 of 21 2.1.1 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org ASTM D 412 Stanadrd for Vulcan
11、ized Rubber and Thermoplastic Elastomers - Tension ASTM D 471 Standard for Rubber Property - Effect of Fluids ASTM D 1349 Standard Practice for Rubber - Standard Temperatures for Testing ASTM D 1418 Standard Practice for Rubber and Rubber Latices - Nomenclature ASTM D 3182 Standard Practice for Rubb
12、er Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets ASTM D 3767 Rubber - Measurement of Dimensions ASTM D 4678 Standard Practice for Rubber - Preparation, Testing Acceptance, Documentation, and Use of Reference Materials 2.1.2 ISO Publicatio
13、ns Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO 1629 Rubber and latices - Nomenclature ISO 2230 Vulcanized rubber property - Guide to storage 3. SRE COMPOSITION 3.1 The recommended mixing procedures and speci
14、fied properties are from the identified materials in the annexes. 3.2 The compounding and preparation ensure the property profile; a. agrees sufficiently with the material group and applications it represents; b. exhibits reasonable “sensitivity” to designated fluid additive and base stock changes;
15、c. is consistent for reliable reproducibility. 3.3 SRE compound materials must be readily available worldwide. 4. SUMMARY OF PREPARATION 4.1 Each compound shall be a homogeneous mix of all materials shown in the annexes, weighed to the accuracy required in ASTM D 3182. 4.2 The mixing of compounds an
16、d vulcanization of test sheets follow ASTM D 3182, modified to details given in each annex condition and procedure. 4.3 Approved Mixing and Distribution Facilities See Appendix. SAE INTERNATIONAL J2643 Revised DEC2013 Page 3 of 21 4.3.1 An SRE by definition is mixed only by approved designated facil
17、ities authorized to mix, and distribute these compounds. See 4.3.2. 4.3.2 Approved Facility Akron Rubber Development Lab, 2887 Gilchrist Road, Akron, OH 44305. 4.3.3 Labs can mix approved SRE formulations for internal use only. 5. REQUIREMENTS AND TESTING 5.1 Sheet Dimensions The vulcanized sheets m
18、eet ASTM D 3182 Figure 1 mold cavity dimensions measured to ASTM D 3767. 5.1.1 All sheets are tested for thickness. One test sheet from each lot (all sheets from a single batch vulcanized under the same conditions) is tested for the specified properties for compliance with the tolerances given in th
19、e annexes. 5.2 Sheet Appearance The molded sheet must be free of any surface defects or internal voids observed with normally corrected vision. 5.3 Identification Using mold marks or visible, durable ink, mark each sheet along one edge with the ASTM D 1418 / ISO 1629 nomenclature letters with SRE fo
20、rmulation number, mix number, lot number, and grain direction (arrow). Separate each item with a slash (/) mark (see Figure 1). FIGURE 1 - IDENTIFICATION PROTOCOL OF TEST SLABS EXAMPLE 5.4 Lot Testing A sufficient number of molded test sheets from each lot (all sheets from a single batch vulcanized
21、under the same conditions) is tested for compliance to specified properties using the appropriate test (see item 7.1). 5.4.1 Each shipped lot will include the approved lab(s) certification that the material complies with its annex requirements. 5.4.2 Test specimens are cut 15mm in from the sheet edg
22、e, with the longitudinal axis parallel to the sheet grain direction. 5.4.3 Test 5 specimens for each physical property, and 5 specimens for volume change. 6. STORAGE 6.1 Test sheets are stored in accordance to ISO 2230. After one year they are retested or discarded. SAE INTERNATIONAL J2643 Revised D
23、EC2013 Page 4 of 21 6.2 When the composition of any SRE is revised or changed, authorized lab(s) shall not discard stored test sheets for that SRE until new changes are approved by SAE Committee on Automotive Rubber Specifications (CARS). 6.3 In the event SRE changes are made, do not distribute the
24、previous SRE formulation, except for comparative purposes. Authorized lab(s) will phase in the revised SRE when changes are approved. 7. APPLICATION 7.1 Development of SRE Candidate selection (sensitivity) is based on percent change per ASTM D 412, die C, tensile strength, elongation at break, and t
25、ensile stress at 50%. ASTM D 471 percent volume change rounds out the requirements. Hardness measurements may be made but evidence from the Inter Lab Test program indicates that hardness is much less sensitive to differences in “rubber stiffness“ compared to 50% modulus. 7.1.1 Test conditions reflec
26、t OEM engine oil system requirements and the material classification limits. Test temperature conditions follow ASTM D 1349 practice. To achieve equilibrium, immerse test specimens 168 h or longer (as designated). 7.1.2 For each material classification, the tester should be aware of the effect of ae
27、ration on a candidates physical properties during immersion testing. Use the fluid treatment (static or aerated) most representative of the intended use. Appendix tables are based on static immersion. 7.2 Test Fluid Use ASTM Service Fluid 105 to evaluate SRE candidate selection and establish a prope
28、rty loss baseline for engine oil applications using the properties in 7.1. Service Fluid 105 is available from the ASTM Test Monitoring Center, 6555 Penn Ave., Pittsburgh, PA 15206. 7.3 Appendices A-J Appendices A-J gives all formulations for the selected SREs of this standard. Also included in the
29、appendices is a Summary Table for SRE properties. Part 1 contains delta or percent change in property values for each SRE after immersion for 168 hr in ASTM Service Fluid 105 at temperatures as specified in Table 1. Part 2 contains the original properties for each SRE prior to immersion. The summary
30、 table results were obtained in an interlaboratory test program with all of the SREs as listed in the annex and table, using data from eight typical industry laboratories. Prior to the final analysis as indicated in the Summary Table, outlier values were deleted. 7.3.1 The interlaboratory test progr
31、am did not contain a sufficiently large database to obtain interlaboratory standard deviations based on 20 or more degrees of freedom, DF. Thus the value equivalent to the classical or standard () 3 sigma limit (at the DF applicable to each SRE), is defined in the table as t*SDev, where t is the tab
32、ulated 95% confidence or p=0.05 level t value at the DF applicable to the standard deviation, SDev, as evaluated in the test program. TABLE 1 - SRE TEST TEMPERATURE SRE Temperature (C) NBR-1, NBR-2, ECO-1 100 All others 150 7.4 Appendix K Appendix K provides protocol for creation, maintenance and co
33、ntrol of formulations for the selected SREs of this standard. SAE INTERNATIONAL J2643 Revised DEC2013 Page 5 of 21 8. NOTES 8.1 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 bee
34、n made to the previous issue of this document. An (R) symbol to the 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 TH
35、E SAE ENGINE OIL COMPATABILITY WITH RUBBER GASKETS AND SEALS SUBCOMMITTEE OF THE SAE COMMITTEE ON AUTOMOTIVE RUBBER STANDARDS SAE INTERNATIONAL J2643 Revised DEC2013 Page 6 of 21 APPENDIX A A.1 STANDARD REFERENCE FORMULAS AND PROCEDURES A.1.1 Nitrile Rubber A.1.1.1 Standard formulas for the followin
36、g nitrile rubber compounds are given in Tables A2 and A3: TABLE A1 - NBR CURE TYPES Number Type NBR-1 sulfur-cured NBR-2 peroxide-cured A.1.1.2 Mixing procedure shall follow the guidelines in Section 5 of ASTM D 3187. A.1.1.3 Recommended Standard Tensile Sheet Cures Cure NBR-1 specimen 10 minutes at
37、 168 C 335 F. Cure NBR-2 specimen 10 minutes at 182 C 360 F. A.1.1.4 Composition TABLE A2 - COMPOSITION OF SRE NBR-1 (28/S) Ingredient Parts by mass NBR with 28 0.5% by mass of acrylonitrile(1)Zinc oxide(2)Stearic acid, triple press(3)STANGARD 500(4)Carbon black N774 PLASTHALL 7050(5)SPIDER Sulfur(6
38、)N-Cyclohexyl-2-benzothiazolesulphenamide (CBTS) Tetramethyl thiuram disulfide (TMTD) Tetraethyl thiuram disulfide (TETD) 100.0 5.0 2.0 2.0 70.0 5.0 0.5 1.0 1.0 1.0 Total 187.5 1. NIPOL DN2850, Zeon Chemicals, Inc. No equivalent known. 2. KADOX 920C, activator, Zinc Corp. of America. No equivalent.
39、3. C.P. Hall. 4. Blend from Harwick standard. 5. Monomeric plasticizer, C. P. Hall Co. No equivalent. 6. SPIDER S, C.P. Hall. No equivalent. SAE INTERNATIONAL J2643 Revised DEC2013 Page 7 of 21 TABLE A3 - COMPOSITION SRE NBR-2 (28/P) Ingredient Parts by mass NBR with 28 0.5% by mass of acrylonitrile
40、(1)Zinc oxide(2)Stearic acid, triple press(3)STANGARD 500(4)Carbon black N774 PLASTHALL 7050(5)Dicumyl peroxide, 40% active MA carrier(6)100.0 5.0 2.0 2.0 70.0 187.0 1. NIPOL DN2850, Zeon Chemicals, Inc. No equivalent known. 2. KADOX 920C, activator, Zinc Corp. of America. No equivalent. 3. C.P. Hal
41、l. 4. Blend from Harwick standard. 5. Monomeric plasticizer, C. P. Hall Co. No equivalent. 6. DICUP 40 KE Hercules. Burgess clay carrier. No equivalent. SAE INTERNATIONAL J2643 Revised DEC2013 Page 8 of 21 APPENDIX B B.1 POLYACRYLATE RUBBER B.1.1 Standard formulas for the following polyacrylate rubb
42、er compounds are given in Table B2 and B3: TABLE B1 - ACM CURE TYPE Number Type ACM-1 Sodium stearate-cured ACM-2 Dimaine DOTG free cure system B.1.2 Mixing procedure shall follow the guidelines in Section 5 of ASTM D 3187. B.1.3 Recommended Standard Tensile Sheet Cures Cure ACM-1 and ACM-2 specimen
43、 6 Min at 190 C (374 F), Post cure 4 h at 177 C (350 F) B.1.4 Composition TABLE B2 - COMPOSITION OF SRE ACM-1 Ingredient Parts by mass Acrylic rubber(1)Stearic acid VANOX CDPA(2)Carbon black N550(5)Sodium stearate conc. fatty acid ester(3)HyTemp NPC-25(4)100.0 1.0 2.0 80.0 4.0 2.0 4.0 Total 191.0 1.
44、 HYTEMP 4052, Zeon Chemicals, Inc. No equivalent known. 2. Process aid, Strukol WB222. No equivalent. 3. Vulcanizing agent, Zeon Chemicals, Inc. No equivalent. 4. N550 carbon black from Cabot TABLE B3 - COMPOSITION OF SRE ACM-2 Ingredient Parts by mass Acrylic rubber(1)Stearic acid NAUGARD 445(2)VAN
45、FRE VAM(3) Carbon black N550(6) ARMEEN 18D(4)HMDC(3)Rhenogran XLA-60(5) 100.0 1.0 2.0 0.50 65.0 0.50 0.60 2.0 Total 171.60 1. HYTEMP AR12, Zeon Chemicals, Inc. No equivalent known. 2. Both VANFRE VAM and HMDC are from R.T. Vanderbilt , No equivalent. 3. ARMEEN 18D from Akzo Nobel, No equivalent. 4.
46、DOTG free vulcanizing agent from Rhein Chemie, No equivalent. 5. N550 carbon black from Cabot SAE INTERNATIONAL J2643 Revised DEC2013 Page 9 of 21 APPENDIX C C.1 EPICHLOROHYDRIN RUBBER C.1.1 Standard formulas for the following epichlorohydrin rubber compounds are given in Table C2: TABLE C1 - ECO CU
47、RE TYPE Number Type ECO-1 ETU-cured C.1.2 Mixing procedure shall follow the guidelines in Section 5 of ASTM D 3187. C.1.3 Recommended Standard Tensile Sheet Cures Cure ECO-1 specimen 25 minutes at 191 C 375 F. Post cured 4 h at 177 C 350 F. C.1.4 Composition TABLE C2 - COMPOSITION SRE ECO-1 Ingredie
48、nt Parts by mass Hydrin C2000L(1)Carbon black N550 TP95(2)Stearic acid 4- and 5-methylmercaptobenzimidazole(3)NAUGARD 445(4)MAGLITE D GND-75 (ETU)(5)100.0 70.0 10.0 1.0 0.5 1.0 3.0 1.0 Total 186.5 1. HYDRIN C2000L, Zeon Chemicals, Inc. No equivalent known. 2. Plasticizer, Rohm & Haas. No equivalent.
49、 3. VULKANOX MB-2/MG antioxidant, Bayer AG. No equivalent. 4. Ethylene thiourea, accelerator, 75% active. SAE INTERNATIONAL J2643 Revised DEC2013 Page 10 of 21 APPENDIX D D.1 ETHYLENE ACRYLIC RUBBER D.1.1 Standard formulas for the following ethylene acrylic rubber compounds are given in Table D2: TABLE D1 - AEM CURE TYPE Number Type AEM-1 AEM-2 AEM-3 AEM-4 DOTG- diamine cured DOTG free cured AEM G DOTG free cured AEM
