At least three specimens shall be used for each material being tested, for each reagent involved, for each length of conditioning, and for each strain level. The test specimens shall be as follows: 9. The cut edges of specimens shall be made smooth by sharp cutting, machining, or by finishing with No. Molding shall conform to conditions recommended by the manufacturer of the material see Note 2. The shape and dimensions of specimens shall depend upon the test to be performed and shall conform to the following: 9.
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Evaluating the Resistance of Plastics to Chemical Reagents ASTM D Click on the picture for a larger view To request a quote for this test or others Click Here Scope: This test covers the evaluation of plastic materials for resistance to chemical reagents, simulating performance in potential end use environments. Chemical reagents can include lubricants, cleaning agents, inks, foods, or anything else that the test material may be expected to come in contact with. The test includes provisions for reporting changes in weight, dimensions, appearance and strength properties.
Provisions are made for various exposure times, strain conditions and elevated temperatures. Specimens can be weighed and measured prior to contact with the chemical reagent. Depending upon the type of contact anticipated for the test sample, the exposure to the chemical agent could be immersion, wipe, spray, or saturated gauze.
The test samples are then sealed in a container, and either left at room temperature or placed in an oven. After the agreed upon period of time, the specimens are removed and evaluated for desired properties such as change in weight, appearance or tensile properties vs.
The most typical physical strength properties evaluated are tensile strength and elongation. Specimen size: Specimens are by the agreement of those concerned and can include Tensile bars, disks, flex bars etc.
Barr For applications involving continuous immersion, the data obtained in short-time tests are of interest only in eliminating the most unsuitable materials or indicating a probable relative order of resistance to chemical reagents. The type of conditioning immersion or wet patch depends upon the end-use of the material. Work Item s — proposed revisions of this standard. Prior to ASTM D testing specimen coupons were tested in the device using a strain gauge bonded to the bottom of the specimen coupon. Specimens can be weighed and measured prior to contact with the chemical reagent.
Evaluating the Resistance of Plastics to Chemical Reagents
These practices include provisions for reporting changes in weight, dimensions, appearance, color, strength, and other mechanical properties. Standard reagents are specified to establish results on a comparable basis without precluding the use of other chemical reagents pertinent to specific chemical resistance requirements. Provisions are made for various exposure times, stress conditions, and exposure to reagents at elevated temperatures. The type of conditioning immersion or wet patch depends upon the end-use of the material.