1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards TEST METHOD FOR THE MELT FLOW INDEX OF THERMOPLASTICS EDS-T-7516 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7516TEST METHOD FOR THE MELT FLOW INDEX OF THERMOPLASTICS PAGE: 1/5 ISSUED DATE: 1
2、994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE This standard is used to determine the flow behavior of thermoplastics and the specified load and at the specified temperature. 2. DEFINITION 2.1. Melt flow index (M.F.I): The flow behavior of thermoplastics det
3、ermined by extruding test samples through an orifice in a given time under the specified conditions (load, temperature, etc.) 3. TEST METHOD 3.1. Prepare test pieces of granule or powder type whose composition coincides with that of finished products. 3.2. In case of testing with finished products o
4、f specific shape, each side shall not exceed 5 mm. 3.3. In general, a test piece of 3 to 6g is suitable for one cycle test. 3.4. For initial sample approval and arbitration, at least three cycles of test shall be performed, and for routine quality control at least two cycles of test shall be done. 4
5、. CONDITIONING Conditioning shall be conducted according to the requirements specified on the drawing or material standard. Unless otherwise specified, test pieces shall be stored at a temperature of +232K and a relative humidity of (505)% for minimum 16 hours. 5. APPARATUS 5.1. Testing apparatus fo
6、r the determination of melt flow index (see Fig. 1) 5.2. Temperature regulator which can maintain a certain temperature within a tolerance of 0.5K. 5.3. Microbalance with scale dividing value 1a . 5.4. Stop watch 6. TEST METHOD 6.1. Prior to the test, heat the piston and cylinder at a given test tem
7、perature for at least 15 min. previously. (Unless test temperature is not specified in the drawing or material standard, refer to Table 1.) Keep the test temperature within a tolerance of 0.5K during the test. EDS-T-7516TEST METHOD FOR THE MELT FLOW INDEX OF THERMOPLASTICS PAGE: 2/5 ISSUED DATE: 199
8、4. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Table 1a. Test conditions by resins Resin Condition polyethylene 1, 3, 4, 5, 6, 7 Ethylene - acetate vinyl 1, 2, 3, 4 Polypropylene 4, 6, 14, 16, 17 Polyacetal 4, Cellulose esters 4 Polystyrene 6, 8, 13, 15 Acrylonitrilc-but
9、adiene-styrene 8, 11, 15 Acrylics 9, 10, 13, 14, 15, 17 Polyamides 4, 12, 14, 18, 19 Polycarbonate 20, 21 Table 1b. Temperature and load by test conditions Condition Test temperature () Test load (Kg) N Condition Test temperature () Test load (Kg) N 1 125 0.3253.19 12 230 0.3253.19 2 150 2.16(21.18
10、13 230 1.20011.773 190 0.3253.10 14 230 2.1621.18 4 190 2.1621.18 15 230 3.8037.26 5 190 5.0049.03 16 230 5.0049.03 6 190 10.0098.07 17 230 10.0098.077 190 21.60211.82 18 275 0.3253.19 8 200 5.0049.03 19 275 2.1621.18 9 200 10.0098.07 20 280 2.1621.18 10 210 10.0098.07 21 300 1.2011.77 11 220 10.009
11、8.07 6.2. Fill the pre-heated cylinder with test pieces, and compress it sufficiently for 1 min. by means of the piston. 6.3. After compression, heat again for 4 min. Apply the specific load to it according to Table 2, and start the stopwatch form when the cylinder top meets the first marking line o
12、f the piston rod (or when the signal sound of the apparatus is heard) and remove the test piece extruded out through the orifice by then. (Unless test load is not specified on the drawing or material standard, refer to Table 1) 6.4. Cut off the extruded test piece every 1020 mm length and complete t
13、he test when the cylinder top coincides with the second marking line of the piston rod(or when the signal sound of the test piece is stopped). Record the time by then and weigh the test piece extruded during the period of time and measure to the nearest 1 mg. EDS-T-7516TEST METHOD FOR THE MELT FLOW
14、INDEX OF THERMOPLASTICS PAGE: 3/5 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Table 2. Types of weights depending on test load Test load (g) Type of weight 325 W 2160 W + B 1200 W + A 3800 w + C 5000 W + E 12500 W + C + D + E 21600 W + A + B + C + D +
15、E + F 1000 W + G 1050 W + H 10000 W + B + F + I 7. EVALUATION Melt flow index is calculated by the following. MFI = 9-YEUWhere, MFI = Melt flow index (g/10 min.) L = Moving distance of the test piece within the piston (mm) d = Density of the test piece at the test temperature (g/cm3) t = Test time (
16、sec) d = .7Where, M = Extruded weight of the test piece (g) V = Volume of the extruded test piece (cm3) 8. EXPRESSION OF RESULTS Measured melt flow index shall be the arithmetical mean value of each test result in g/10 min and indicated to the nearest 0.1 g/10 min. 9. CODING SYSTEM Melt flow index s
17、hall be indicated on the drawing or material standards as follows: Melt Flow Index to EDS-T-7516-230/2.16 4.55.5 Requirements Test method Test item EDS-T-7516TEST METHOD FOR THE MELT FLOW INDEX OF THERMOPLASTICS PAGE: 4/5 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto
18、 & Technology 10. DEVIATIONS Deviations from the above conditions shall be agreed upon and specified on the drawing or material standard and also in the test certificate or report, etc. 11. REFERENCE DIN 53735 Determination of the melt flow index of thermoplastics EDS-T-7516TEST METHOD FOR THE MELT FLOW INDEX OF THERMOPLASTICS PAGE: 5/5 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Fig. 1. Testing apparatus for the determination of melt flow index
