1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards MEDIUM DENSITY POLYETHYLENE EDS-M-4131 ISSUED DATE: 1995. 07. 12 REVISED DATE: 2007. 07. 20 VERSION: 10 EDS-M-4131MEDIUM DENSITY POLYETHYLENE PAGE: 1/4 ISSUED DATE: 1995. 07. 12 REVISED DATE: 2007. 07. 20 VERSION: 10
2、GM DAEWOO Auto & Technology 1. SCOPE This specification defines general requirements for raw materials of medium density polyethylene applied to interior and exterior parts of a vehicle. 2. MATERIAL INDICATION Material indication: PE-MD Detailed contents shall conform to the indication method of syn
3、thetic resin materials for vehicles. (Spec. No: GMW3116) 3. APPLICATION 3.1. Group 1: Raw materials for blow molding whose melt flow index is less than 0.4 and which have higher hardness and rigidity than low density polyethylene. Ex) Sunvisor bracket 3.2. Group 2: Raw materials for blow molding who
4、se melt flow index is 0.4 1.2 and which have higher hardness and rigidity than low density polyethylene. 3.3. Group 3: Raw materials for injection molding whose melt flow index is 1 3 and which have higher hardness and rigidity than low density polyethylene. 3.4. Group 4: Raw materials for injection
5、 molding whose melt flow index is 3 10 and which have higher hardness and rigidity than low density polyethylene. Ex) Energy Absorber Bracket 4. REQUIREMENTS 4.1. Mechanical properties Group 1 Type 1 Group 3 Type 1 Group 4 Type 1 Group 4 Type 2 Shore D hardness EDS-T-7403 552 602 552 602 Tensile str
6、ength (kg/cm2) EDS-T-7511 Test piece (63mm) Test speed (50mm/min) 200 200 150 150 Elongation (%) EDS-T-7511 Test piece (63mm) Test speed (50mm/min) 300 500 500 300 EDS-M-4131MEDIUM DENSITY POLYETHYLENE PAGE: 2/4 ISSUED DATE: 1995. 07. 12 REVISED DATE: 2007. 07. 20 VERSION: 10 GM DAEWOO Auto & Techno
7、logy Group 1 Type 1 Group 3 Type 1 Group 4 Type 1 Group 4 Type 2 Flexural strength (kg/cm2) EDS-T-7518 Test piece (12712.76.4mm) Test speed (28mm/min) - 150 150 150 Flexural modulus (kg/cm2) EDS-T-7510 Test piece (12712.76.4mm) Test speed (28mm/min) 5,000 4.000 4,000 4,500 Impact strength, IZOD (kg
8、cm/cm) EDS-T-7514 Test piece (63.512.73.2mm) Room temperature -30 NB - NB - NB - NB - 4.2. Thermal properties Melting point () EDS-T-7519 DSC Temperature rise rate: 20 /min 1273 - 1273 - Heat deflection temperature () EDS-T-7520 Test piece (12712.76.4mm) 4.6 kg/cm265 70 80 65 Vicat softening point (
9、) EDS-T-7504 1kg 100 110 - 110 4.3. General properties Density (g/cm3) EDS-T-7406 0.930.010.930.01 0.930.010.930.01Melt flow index (g/10min) EDS-T-7516 190, 2.16kg 0.4 1 3 5 3 10 Note) All the mechanical, thermal and general property values above indicate minimum values except having specified range
10、s. 5. TEST PIECE AND TEST 5.1. Test piece Test pieces shall be prepared with injection molding. Unless otherwise specified in the requirements of clause 4, they shall be conditioned at 235K and a relative humidity of 50% for 24 hours or more. 5.2. Test Tests shall be performed at 235K and a relative
11、 humidity of 50%. EDS-M-4131MEDIUM DENSITY POLYETHYLENE PAGE: 3/4 ISSUED DATE: 1995. 07. 12 REVISED DATE: 2007. 07. 20 VERSION: 10 GM DAEWOO Auto & Technology 6. APPROVAL OF RAW MATERIALS 6.1. Approved raw materials Division Approved suppliers Approved raw materials Remarks Group 1 Type 1 BASF, SAMS
12、UNG total petrochemical Co., Ltd3020D, R902S Group 3 Type 1 SAMSUNG total petrochemical Co., Ltd R903U Group 4 Type 1 DAELIM industrial, SAMSUNG total petrochemical Co., LtdLH-3250, R901U Group 4 Type 2 HYUNDAI Petrochemical Co., Ltd. UR644 6.2. Approval and quality assurance procedure All raw mater
13、ials shall be approved and regularly inspected for its quality prior to and during mass production delivery according to approval and quality assurance procedure for chemical raw materials (Spec. No. EDS-M-0102). 7. AUTOMOTIVE RESTRICTED HAZARDOUS SUBSTANCES Materials and components of parts must co
14、mply with GMW3059. 8. OTHERS 8.1. Coding system Material specification of raw materials shall be indicated in drawings as follows. EDS-M- 4131 - - Additionally required properties -HR: Heat resitance - WR : Weather resistance - LR : Light resistance - CR : Chemical resistance Required property (clau
15、se 4) Material group (clause 3)Material specification number EDS-M-4131MEDIUM DENSITY POLYETHYLENE PAGE: 4/4 ISSUED DATE: 1995. 07. 12 REVISED DATE: 2007. 07. 20 VERSION: 10 GM DAEWOO Auto & Technology 9. RELATED STANDARDS EDS-M-0102 Procedures for approval of chemical raw material and quality contr
16、ol EDS-T-7406 Determination of volume and density of elastomers EDS-T-7510 Testing of plastics determination of the modulus of elasticity by tensile, compression and flexural test EDS-T-7511 Test method for the tensile property of plastics EDS-T-7514 Test method for determining the flexural strength
17、 of plastics EDS-T-7516 The test method for the melt flow index of thermoplastics EDS-T-7517 The test method for Rockwell hardness of plastics EDS-T-7518 The method for the flexural strength of plastics EDS-T-7520 Test for deflection temperature of plastics under load GMW3059 Automotive Restricted Hazardous Substances for Parts GMW3116 Recyclability/Recoverability Guidelines
