1、 FORD LABORATORY TEST METHOD EU-BO 058-02 Date Action Revisions 2001 03 28 Revised Editorial no technical change A. Cockman 1994 02 28 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF THE GRADE OF MATURATION OF PRE-PREGS Application This tes
2、t method is used to determine the grade of maturation of pre-pregs made from unsaturated polyester resins in combination with glass fiber. Apparatus Required Pressure Control Equipment Pressure control equipment which allows the application of constant loads of 5 N or 75 N respectively to the sample
3、 uniformly and smoothly. Indentor Foot Measuring Gauge A measuring gauge to measure the depth of penetration with an accuracy of 0.01 mm and a degree of movability of 10 mm. Stop Watch Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled
4、 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. Note: Cutting and testing of the samples have to be carried out under the same conditions. Procedure 1. A fresh pre-preg is to take out
5、from the original sack immediately for each test to avoid any loss of styrol. Attention must be taken that the pre-preg does not contain any wrinkles and thickenings by chance. 2. From the pre-preg 4 samples are cut 100 x 100 mm in size. The 4 samples are piled up in layers without removing the foil
6、 FORD LABORATORY TEST METHOD EU BO 058-02 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. 3. Thereafter the prepared pre-preg sample has to be placed under the piston of the pressure equipment and the measuring gauge is to be set to zero. 4. Following this the pre-preg is loaded with the
7、 constant preload of 5 N for 30 seconds (stop watch). After 30 seconds the thickness of the pre-preg is read-off on the measuring gauge (h1). 5. Following the preload period, the constant main load of 75 N is immediately applied. After a further 5 minutes the thickness is read-off again (h2). Evaluation The grade of maturation is calculated as follows: Grade of maturation in % = h 1 h 2 x 100 h1 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.
