1、 FORD LABORATORY TEST METHOD BO 021-01 Date Action Revisions 2001 03 27 Editorial no technical change A. Cockman 1992 07 27 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF FLOW RATIO OF POLYETHYLENES Application This procedure is used to de
2、termine the flow ratio which gives an indication of the molecular weight distribution of polyethylene plastics. Apparatus Required Extrusion Plastometer (Melt Indexer) Source: Tinius Olsen Testing Machine Co. Willow Grove, PA or F. F. Slocom Corporation Wilmington, DE Weights (a) 2060 +/- 10 g weigh
3、t (b) Weights totalling 9,900 +/- 50 g (weights + piston = 10,000 +/- 50 g) Stop Watch Analytical Balance Beam Balance Preparation of Samples The test specimen may be in any form which can be introduced into the bore of the cylinder; for example, powder, granules, strips or molded slugs. Conditionin
4、g and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. FORD LABORATORY TEST METHOD BO 0
5、21-01 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. Procedure 1. Determination of melt index. (See ASTM D 1238, Condition E) 2. Determination of flow index. (a) The total mass of the piston and weight shall be 10,000 +/- 50 g. The other conditions are the same as for the melt index. (b)
6、 Start the timer and place a full charge into the cylinder (7 to 9 grams), and put the piston and 2060 g weight in place. (The 2060 g weight is used during the preheat period only.) (c) After 3 minutes, force out enough of the charge by hand pressure so that after an additional 2 minutes, the cylind
7、er will be about one-half full. (d) After the additional 2 minutes (total of 5 minutes elapsed time), replace the 2060 g weight with the 9900 g weight and cut off and discard the extruded portion of the specimen at the orifice. (e) Collect the extrudate for the next 30 seconds. (f) Follow the cleani
8、ng procedure outlined in the melt index determination. (g) Weigh the 30 second extrudate to the nearest milligram and calculate the flow index as the rate of extrusion in grams per 10 minutes. weight of extrudate in grams x 10 = flow index time of extrudation in minutes 3. Determination of flow ratio. flow index = flow ratio melt index Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
