MaTestLab > ASTM Methods > ASTM D638 Standard Test Method for Tensile Properties of Plastics
ASTM D638 Standard Test Method for Tensile Properties of Plastics
ASTM D638 is a test method that determines the tensile properties of reinforced and unreinforced plastics under the defined conditions of pretreatment, temperature, humidity, and testing machine speed. ASTM D638 method is helpful in outlining accuracy requirements for the test frames and accessories used. Manufacturers can easily gauge the mechanical strength of plastic and resin materials using ASTM D638. Read more about ASTM D638 Tensile Properties of Plastics below.
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Introduction to ASTM D638
ASTM D638 is a test method designed to measure the tensile properties of plastics and resins. Tensile properties provide valuable data for plastics engineering design purposes. Tensile properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials, are determined by this test method. The results obtained are specially used for quality control and specification purposes. ASTM D638 is used for calculating the mechanical properties of plastics and resins and outlining accuracy requirements for the test frames and accessories used. The ASTM D638 test method determines the tensile properties of plastics (unreinforced and reinforced) specimens in the form of standard dumbbell shape when tested under defined conditions of pretreatment, temperature, humidity, and testing machine speed.
MaTestLab has the best network of testing labs in the USA to carry out ASTM D638 tests for our clients. ASTM D638 test method generally applies to rigid and semi-rigid plastics and is helpful for qualitative characterization, research, development, and plastic engineering design purposes. Manufacturers can easily gauge the mechanical strength of plastic and resin materials using ASTM D638.
ASTM D638 Test Method
This test method proceeds by measuring the thickness of each specimen to the nearest 0.025 mm and within 5 mm of each end of the gauge length. The specimen rests on two supports and is loaded by means of a loading nose midway between the supports. ASTM D638 test parameters, based on sample thickness, are support span, loading speed, and percent elongation.
Test procedure for injection molded specimens
The specimen is first placed in the grips of the testing machine by carefully aligning the long axis of the specimen and the grips. Then an extension indicator is attached to determine the modulus of strain, elasticity, and percent elongation.
Test procedure for thin sheeting
For thin sheeting, such as films less than 1.0 mm, the width of specimens is taken as the distance between the cutting edges of the die in the narrow section. The diameter of the specimens is determined and the load extension curve is recorded for the specimen by taking measurements for load extension at the yield point and at the moment of rupture respectively.
ASTM D638 Specimens
Specimen details
ASTM D638 Specimens must be dumbbell shaped.
Specimen dimensions
The general sample size for ASTM is 14 mm (0.55 in.) thickness. For thin sheeting, the preferred sample thickness is 1.0 mm (0.04 in.)
Specimen preparation
Specimens are injection molded, machine operated, or cut from materials in sheet, plate, slab, or similar form.
ASTM D638 Results
This test method evaluates tensile strength, percent elongation, percent elongation at yield, and nominal strain of the plastic specimens. This test also measures the Tangent Modulus of Elasticity (also known as modulus of elasticity) and the Secant Modulus of plastic materials. Tensile properties vary with specimen depth, temperature, atmospheric conditions, and strain rate.
Tests Related to ASTM D638 ISO 527-1 is similar to ASTM D638 in the subject matter. As per the ASTM D638 test method, the test is stopped if the sample is crushed due to tightened grip. As per ISO 527-1, the test is ceased when the sample ultimately breaks. If the sample does not break, the test is continued, and the tensile properties are recorded. ISO 527-1 differs from D638 in terms of technical content. ISO 527-1 covers the determination of tensile properties of rigid and semi-rigid molding materials, fiber-reinforced thermosets, thermoplastic composites, and thermotropic liquid crystal polymers under defined conditions.
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How much do I need to pay for the astm d638 test?
Please contact us for a detailed quote for your astm d638 testing needs. Cost incurred to carry out different astm d638 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm d638?
The required number of samples or specimens should comply with the procedure given in the astm d638 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm d638 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm d638 test?
The turnaround time for astm d638 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d638 tested?
You can share your astm d638 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d638 test to various testing techniques.
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