Test Laminate coupons:
Test laminate coupons for the astm d543 Practice A, Procedure I test were cut from Saint-Gobain Technical Fabrics Plates 6, 14, and 16. Eighteen laminate coupons came from Plates 14 and 16 and measured approximately 100 mm in length by 25 mm in width and 5 mm in depth. Twelve laminate coupons came from Plate 6 and measured 76 mm by 25 mm and 5mm deep. Dimension measurements were measured using a digital calliper accurate to ±0.005 mm. While measuring the laminate coupons it was noted that the specimen edges were at a slight angle with respect to the deepness of the material. This slight angle resulted in laminate coupons being moderately wider on one face (top compared to bottom). This slight angle is a characteristic of the JetCut process.
A total of 30 test laminate coupons were tested: three laminate coupons for each of the 10 chemical reagents.
Test Equipment:
For each chemical reagent, three laminate coupons of the laminate were placed in a plastic container with a lid and held at room temperature. The laminate coupons were mounted on small stainless steel discs (3 mm in diameter and a depth of 1 mm) to ensure that most of the specimen surface area was in contact with the reagent. Figure 3.2 illustrates the test set-up used for Practice A Procedure I testing.
Figure 3.2 ATSM D543 test set up and equipment used for Practice A - Procedure I.
Test Results:
Testing was conducted from May 9, 2001 to August 20. In total 30 laminate coupons were tested. The laminate coupons were labelled according to the following scheme. l_la = Plate #_Chemical Reagent # (1 = water), Specimen a l_lb = Plate #_Chemical Reagent # (1 = water), Specimen b l_lc = Plate #_Chemical Reagent # (1 = water), Specimen c
Each chemical reagent was assigned an identifying number. 1 = Water - Control 2=1% Nitric Acid
3 = 1% Ferric Chloride
4 = 5% Ammonium Hydroxide 5=1% Sodium Hypochloride
6 = 5% Sodium Hydroxide
7 = 20% Sulphuric Acid
8 = 0.1% Soap
9 = 0.1% Detergent
10 = BOD not less than 700 PPM
Analysis of Test Data:
Tables 3.1, 3.2, and 3.3 present a summary of ASTM D543 Weight and Dimensions Changes test results for the maximum, minimum, and average changes for each chemical reagent.
•0.06 to 1.00 mm with an average change of 0.04 mm. The change in depth of the laminate coupons ranged from 0.00 to 0.25 mm with an average change of 0.09 mm.
Visible changes to the laminate coupons such as loss of gloss, developed texture, decomposition, discoloration, swelling, cloudiness, etc were minor if non-existent for all the chemicals tested. The most common visible observations made for the coupons were:
• Rough edges
• Fibres fraying at the sides of the coupons
• Partial loss of gloss on some areas of the surface
• Discoloration as the beige amber colour appears to have faded slightly
• White fibres were less distinct.
Figure 3.3 illustrates normalized average coupon weight and dimension changes after immersion in each chemical reagent. This graph was normalized by dividing the average reading of the three test coupons after immersion in the chemical reagent by the average reading of the three coupons prior to immersion. No change in average readings after immersion would result in a normalized change of unity. Normalized change values greater than or less than unity would indicate an increase and decrease in reading respectively after immersion in the chemical reagent.
Based on Figure 3.3 the following may be concluded.
1) All coupons showed less than 3.5% increase in readings after immersion in the chemical reagents.
2) Length and width changes (less than 0.5%) were less than weight and depth changes (approximately 1.6 to 3.2%).
For length and depth readings water and 1% Ferric Chloride showed the smallest change (less than 2.0%) while 5% Ammonium hydroxide showed the greatest change (3.2% in weight and depth). All the other chemical reagents showed weight and dimension change of approximately 2.6% and 2.2% respectively.For details to know visit
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