1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards THE TEST METHOD DETERMINING THE MELTING TEMPERATURE OF PLASTICS EDS-T-7519 ISSUED DATE: 1995. 09. 06 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7519THE TEST METHOD DETERMINING THE MELTING TEMPERATURE OF PLASTICS PAGE
2、 1/2 ISSUED DATE: 1995. 09. 06 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE This test method is used to determine the melting temperature, a major thermal change of crystalline polymer 2. DEFINITION 2.1. Melting temperature: The melting point of the crystal of crysta
3、lline polymer that melts at the highest temperature 3. TESTS PIECES 3.1. Method 1 Take a sample of 50 100 mg out of a completed product 3.2. Method 2 Take a sample of 50 100 mg out of a completed product as thin as possible 3.3. Tests shall be conducted twice or more for initial approval and once fo
4、r quality control 4. CONDITIONING Test pieces shall be left at a temperature of +232K and relative humidity of (505) for 24 hours min. before tests. 5. APPARATUS 5.1. Method 1 5.1.1. Thermal analysis DuPont 2100 model or the one equivalent to it. A heat - flow type DSC(differential scanning calorime
5、ter) module shall be furnished. 5.2. Method 2 5.2.1. Hot stage: Mettler FP 82 or the one equivalent to it 5.2.2. Temperature controller: METTLER FP 80 or the one equivalent to temperature controller 5.2.3. Microscope of 400 magnifications 5.2.4. Slide glass and cover glass 5.3. Cutter to take sample
6、s 5.4. Tweezers EDS-T-7519THE TEST METHOD DETERMINING THE MELTING TEMPERATURE OF PLASTICS PAGE: 2/2 ISSUED DATE: 1995. 09. 06 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 6. PROCEDURE 6.1. Test method 1 6.1.1. Put a prepared test piece into an aluminum pan(a copper pan is used w
7、hen temperature goes up to +400 or more) and make it a capsule using an encapsulating press. 6.1.2. Prepare another aluminum pan and make it a capsule as empty. Then put it into a DSC cell of a thermal analyzer together with a pan with a test piece. 6.1.3. Set the starting and finishing temperature
8、at 50 and 300 respectively. After setting the temperature rise rate at 20/min, operate the DSC. 6.1.4. Terminate the test when the temperature of the DSC cell reaches 300. Then analyze the peak value to determine the melting temperature. 6.2. Test method 2 6.2.1. After putting a test piece on a slid
9、e glass, put a cover glass on it and mount it on the hot stage 6.2.2. Using the temperature control, set the initial test temperature to 100 and the temperature rise rate to 20/min and raise the temperature of the hot stage. 6.2.3. After setting the magnification of the microscope to 400, examine th
10、e test piece on the hot stage and record the temperature when the test piece starts to melt. 7. EXPRESSION OF RESULT Indicate the numerical mean of measured melting temperature in to 0.1. 8. CODE SYSTEM The melting temperature is indicated as follows in drawings and material specifications. Melting temperature EDS-T-7519-Test method 1 - +135 Requirements Test method Test item
