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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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.TO PLACE A DOCUMENT ORDER: +1 (724) 776-4970 FAX: +1 (724) 776-0790SAE WEB ADDRESS http:
3、/www.sae.orgCopyright 1993 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001STANDARDJ1875REAF.MAY2001Issued 1993-06Reaffirmed 2001-05Superseding J1875 JUN1993Materials for Plastic Check Valves for Vacuum Booster
4、 Systems1. ScopeThe materials defined by this SAE Standard are unreinforced thermoplastic acetal and thermoplastic6/6 heat stabilized nylon, as both materials will function in this application.The specific material chosen will depend on the final applications surroundings and heat requirements. They
5、are for use in vacuum booster check valves for hydraulic brake systems.2. References2.1 Applicable PublicationThe following publications form a part of this specification to the extent specifiedherein.2.1.1 ISO PUBLICATIONSAvailable from ANSI, 25 West 43rd Street, New York, NY 10036-8002.ISO 75Plast
6、ics and eboniteDetermination of temperature of deflection under loadISO 175PlasticsDetermination of the effects of liquid chemicals, including waterISO 178PlasticsDetermination of flexural properties of rigid plasticsISO 180PlasticsDetermination of Izod impact strength of rigid materialsISO/R 527Pla
7、sticsDetermination of tensile propertiesISO 1183Plastics-Methods for determining the density and relative density of non-cellular plasticsISO 2039/2PlasticsDetermination of hardnessRockwell hardness2.1.2 ASTM PUBLICATIONSAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.AS
8、TM D 256Test Methods for Impact Resistance of Plastics and Electrical Insulating MaterialsASTM D 543Standard Test Method for Resistance of Plastics to Chemical ReagentsASTM D 638Standard Test Method for Tensile Properties of PlasticsASTM D 648Standard Test Method for Deflection Temperature of Plasti
9、cs Under Flexural LoadASTM D 785Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating MaterialsASTM D 790Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plasticsand Electrical Insulating MaterialsASTM D 792Standard Test Methods for Density and
10、Specific Gravity (Relative Density) of Plastics byDisplacementSAE J1875 Reaffirmed MAY2001-2-3. General Material Requirements3.1 ConditioningAll test values are based on materials dry as molded or conditioned in a controlled atmosphereof 23 C 2 C and 50% 5% relative humidity for 24 h prior to testin
11、g and tested under the sameconditions.4. Test RequirementsSee Table 1.4.1 Fluid AgingThe material when tested by the producer specified in 5.7 shall have a weight gain of not morethan 2.0%.5. Test Procedures5.1 Specific GravityDetermine the Specific Gravity of the material by ASTM D 792 (ISO R 1183)
12、.5.2 HardnessDetermine the Rockwell Hardness of the material by ASTM D 785 using scale R (ISO 2039/2).5.3 Tensile StrengthDetermine the Tensile Strength of the material by ASTM D 638 (ISO R 527). Type Isample size.5.4 Modulus of ElasticityDetermine the Tangent of Modulus of Elasticity (Flexural Modu
13、lus) of the material byASTM D 790 (ISO 178).5.5 Impact StrengthDetermine the notched Izod Strength of the material by ASTM D 256 (ISO 180). Samplesto be 3.18 mm thick.5.6 Deflection TemperatureDetermine the Deflection Temperature by ASTM D 648, using a test specimen thatis 127 x 12.7 x 12.7 mm and a
14、 load of 1.820 MPa (ISO 75).TABLE 1TEST REQUIREMENTSProperty Tested UnitsThermoplasticAcetalType 6/6 NylonHeat StabilizedSpecific Gravity 1.41 0.02 1.14 0.02Hardness, Rockwell R 115 min 118 min(1)1. dry as moldedTensile Strength MPa 62 min 55 min(1)44 min(2)2. 50% relative humidityFlexural Modulus M
15、Pa 2400 min 2550 min(1)1100 min(2)Izod Impact J/M 62 min 28 min(1)96 min(2)Deflection Temperature0.5 kPa C 160 min 225 min1.8 kPa C 125 min 85 minSAE J1875 Reaffirmed MAY2001-3-5.7 Fluid AgingDetermine the Fluid Aging of the material by immersing a test specimen that is 51 mm indiameter and 6.4 mm t
16、hick in SAE RM-66-04 brake fluid for 168 h at a temperature of 70 C in accordance withASTM D 543 (ISO 175). Also test material in SAE 10W30 oil, antifreeze, and unleaded gasoline. Temperatureof testing to be in accordance with ASTM specification.PREPARED BY THE SAE HYDRAULIC BRAKE COMPONENTS STANDAR
17、DS COMMITTEESAE J1875 Reaffirmed MAY2001RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThe materials defined by this SAE Standard are unreinforced thermoplastic acetal andthermoplastic 6/6 heat stabilized nylon, as both materials will function in this a
18、pplication.The specific material chosen will depend on the final applications surroundings and heat requirements.They are for use in vacuum booster check valves for hydraulic brake systems.Reference SectionISO 75Plastics and eboniteDetermination of temperature of deflection under loadISO 175Plastics
19、Determination of the effects of liquid chemicals, including waterISO 178PlasticsDetermination of flexural properties of rigid plasticsISO 180PlasticsDetermination of Izod impact strength of rigid materialsISO/R 527PlasticsDetermination of tensile propertiesISO 1183PlasticsMethods for determining the
20、 density and relative density of non-cellular plasticsISO 2039/2PlasticsDetermination of hardnessRockwell hardnessASTM D 256Test Methods for Impact Resistance of Plastics and Electrical Insulating MaterialsASTM D 543Standard Test Method for Resistance of Plastics to Chemical ReagentsASTM D 638Standa
21、rd Test Method for Tensile Properties of PlasticsASTM D 648Standard Test Method for Deflection Temperature of Plastics Under Flexural LoadASTM D 785Standard Test Method for Rockwell Hardness of Plastics and Electrical InsulatingMaterialsASTM D 790Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plasticsand Electrical Insulating MaterialsASTM D 792Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics byDisplacementDeveloped by the SAE Hydraulic Brake Components Standards Committee
