×PDF Drive is your search engine for PDF files. As of today we have 50,319,109 eBooks for you to download for free.No annoying ads, no download limits, enjoy it and don't forget to bookmark and share the love! Standard Test Method for Tensile Properties of Plastics. 1 This test method is under the jurisdiction of ASTM Commttee D20 on Plastics and is the direct responsibilty of Subcommttee D20.1O on Mechancal Propertes. Materials Testing Standards for Additive Manufacturing of Polymer. This publication is available free of charge from. (ASTM) and the. This is a list of ASTM International standards. ASTM AIIMASTM: Portable Document Format. ASTM A895: Standard Specification for Free-Machining Stainless.
What are the differences between ASTM D6386 and the new powder coating specification ASTM D7803?
These specifications discuss the necessary surface preparation procedures for the application of a top coating such as paint (ASTM D6386,Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for painting) or powder coating (ASTM D7803, Standard Practice for Preparation of Zinc and Hardware Surfaces for Powder Coating), and are similar in many ways. Each specification has different preparation procedures for galvanized steel that has been aged or weathered for different lengths of time; however, there are some key differences between the two.
The first notable difference is D6386 allows for the application of wash primers (i.e., SSPC Paint Specification No. 27) and acrylic passivation/pretreatment to the galvanized coating prior to paint application. D7803 does not allow for these types of preparation of the galvanized coating prior to application of powder coating.
The second notable difference between the two specifications is D7803 gives guidance for thermal pretreatment or baking of the galvanized steel prior to powder coating, whereas D6386 does not. Thermal pretreatment of galvanized steel is necessary prior to powder coating to prevent outgassing of the galvanized coating during the baking step in the powder coating curing process. Outgassing occurs when moisture trapped in the outer layer of the coating evaporates as the galvanized steel is heated when the powder coating is baked on. The result of outgassing is pinholing or blistering in the powder coating. By preheating the galvanized steel or iron, the moisture evaporates prior to powder coating application, thereby reducing the chance of pinholing or blistering. D7803 gives guidance for oven temperatures for preheating.
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The American Galvanizers Association has developed an instructional DVD and guidebook detailing necessary preparation of galvanized coatings prior to powder coating. A similar DVD and guidebook for preparing galvanized coatings prior to paint application is also available. ASTM D6386 and D7803 can be obtained directly from ASTM International at www.astm.org.
© 2019 American Galvanizers Association. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use.
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This test method is applicable for testing materials of anythickness up to 14 mm (0.55 in.). However, for testing specimens inthe form of thin sheeting, including film less than 1.0 mm (0.04in.) in thickness, ASTM standard D882 is the preferred test method.Materials with a thickness greater than 14 mm (0.55 in.) shall bereduced by machining.
This test method includes the option of determining Poisson'sratio at room temperature.
NOTE 1—This standard and ISO 527-1 address the same subjectmatter, but differ in technical content.
NOTE 2—This test method is not intended to cover precisephysical procedures. It is recognized that the constant rate ofcrosshead movement type of test leaves much to be desired from atheoretical standpoint, that wide differences may exist betweenrate of crosshead movement and rate of strain between gage marks onthe specimen, and that the testing speeds specified disguiseimportant effects characteristic of materials in the plastic state.Further, it is realized that variations in the thicknesses of testspecimens, which are permitted by these procedures, producevariations in the surface-volume ratios of such specimens, and thatthese variations may influence the test results. Hence, wheredirectly comparable results are desired, all samples should be ofequal thickness. Special additional tests should be used where moreprecise physical data are needed.
NOTE 3—This test method may be used for testing phenolic moldedresin or laminated materials. However, where these materials areused as electrical insulation, such materials should be tested inaccordance with Test Methods D229 and Test Method D651.
NOTE 4—For tensile properties of resin-matrix compositesreinforced with oriented continuous or discontinuous high modulus>20-GPa (>3.0 × 106-psi) fibers, tests shall be made inaccordance with Test Method D3039/D3039M.
Test data obtained by this test method have been found to beuseful in engineering design. However, it is important to considerthe precautions and limitations of this method found in Note 2 andSection 4 before considering these data for engineering design.
The values stated in SI units are to be regarded as standard.The values given in parentheses are for information only.
This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.