1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 09 21 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.7, 3.8 & 4 1991 08 01 Released EP00E01089487000 L. Rodigas Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 2 POLYTETRAFLUOROETHYLENE (PTFE) WSK-M
2、4D632-A2 PASTE EXTRUSION COMPOUND 1. SCOPE The material defined by this specification is a fine powdered polytetrafluoroethylene (PTFE) compound suitable for paste extrusion process. 2. APPLICATION This specification was released originally for material used for throttle cable liners. 3. REQUIREMENT
3、S 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MOLDING COMPOUND 3.4.1 Melting Peak Temperature 315 - 355 C (ASTM D 1457) 3.4.2 Particle Size 350 - 650 microme
4、tre (ASTM D 1457) 3.4.3 Apparent Density 420 - 550 g/1000 cm3(ASTM D 1457) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Test specimens shall be prepared according to ASTM D 1457. (The sinter conditions shall be as recommended by the supplier of the PTFE compound.) 3.5.2 Density 2.14
5、 2.24 g/cm3(ASTM D 1457) 3.5.3 Tensile Strength at Max Load, min 18 MPa (ASTM D 1457) 3.5.3.1 Elongation at Break, min 200% 3.5.4 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 204 +/- 2 C. Unaged property values shall be determined at the time of the aged propertie
6、s determination) ENGINEERING MATERIAL SPECIFICATIONPrinted copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 2 3.5.4.1 Tensile Strength at Max Load Change +/- 10% (Test Method per para 3.5.3) 3.5.4.2 Elongation at Break Change +/- 10% (Test Method per para 3.5.3) 3.6 TH
7、ERMAL INSTABILITY INDEX, max 50 (ASTM D 1457) 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 15 - 20-5/ C (ASTM D696) 5.2 EXTRUSION PRESSURE 5 - 20 MPa or (
8、ASTM D 1457, Reduction Ratio 400:1 or min 500:1) 25 - 55 MPa 5.3 SINTERING CONDITIONS FOR TEST SPECIMENS (ASTM D 1457) Initial Temperature 290 C Rate of Heating 120 +/- 10 C/h Sintering 1 30 minutes at 380 +/- 5 C Cooling Rate 60 +/- 5 C/h Sintering 2 25 minutes at 294 +/- 5 C Cooling Period to Room Temperature 30 minutes 5.4 RECYCLING CODE SAE OPTIONAL PTFE
