ASTM D1708 Tensile Properties of Plastics by Use of Micro tensile Specimens
ASTM D1708 is a test method for determining the tensile properties of plastics using microtensile specimens. The process assesses key mechanical properties like tensile strength, elastic modulus, elongation at break, and other tensile properties, with small, accurately cut samples. Commonly employed for material development, quality control, product qualification, and conformance to material specifications for plastics, aerospace, automotive, medical device, packaging, electronics, and research applications. Standardized tensile testing can accurately test small or limited material samples and provide reliable comparisons between various plastic materials.
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What is ASTM D1708?
ASTM D1708 is a standard laboratory test method used for determining the tensile properties of plastics using microtensile specimens. A small specimen is tightly anchored to a universal testing machine and pulled at a specified rate until it fails. The test measures the applied load and the volume of the load chamber to describe the material’s mechanical properties. ASTM D1708 (Standard Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens) is designed for small plastic specimens or thin polymeric materials where the specimen size makes conventional tensile testing impractical. This yields material data for engineers to consider when designing products and applications for resistance, rigidity, extensibility, and mechanical properties.
Get Certified ASTM D1708 Testing for Reliable Tensile Property Evaluation
Certification ensures plastic products have been tested to the prescribed microtensile test methods. With controlled loading, the laboratory determines tensile strength, modulus of elasticity, elongation, and other mechanical properties. ASTM D1708 certification incorporates quality assurance, material qualification, engineering design, product development, and compliance with regulatory requirements to ensure reliability in mechanical performance for challenging applications.
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What is the Scope of ASTM D1708 Test Standard?
ASTM D1708 is a standard test method that determines the tensile properties of plastics in a controlled laboratory environment and with the use of a microtensile specimen. This standard
Tests to determine the strength of plastics when they are stretched.
Determines the properties of elasticity and elongation at break.
Tests the mechanical properties of micro specimens.
Assists in materials development and engineering design.
It is applicable to thin plastics, polymers, elastomers, films, fibers, coatings, or micro-molded parts.
Performs routine tensile testing for QC & product qualification.
What are the Uses of ASTM D1708 Testing?
This test assesses the mechanical properties of small plastic parts where standard tensile testing isn’t possible. The results are used for material selection, product development, quality assurance, and engineering design.
Automotive manufacturers evaluate lightweight and micro-molded plastic parts to ensure they have suitable strength and durability in service.
Aerospace companies evaluate advanced polymer materials for lightweight structural applications that require consistent mechanical behavior.
Medical device manufacturers test miniature plastic parts, implant materials, and precision-molded products to ensure mechanical reliability.
In the packaging industry, thin plastic films and polymer sheets are assessed for strength and flexibility to ensure they can withstand specific conditions.
Research laboratories evaluate the mechanical performance of new polymer formulations, composite materials, and processing techniques.
Quality control laboratories routinely perform ASTM D1708 to ensure the product conforms to customer specifications and engineering design requirements.
What Materials Can Be Tested Under ASTM D1708?
ASTM D1708 can be used for all kinds of plastics, including thin plastics, thermoplastics, thermosetting polymers, elastomers, polymer film, fibers, coatings, composite materials, micro-molded components, engineering plastics, and other small or delicate polymer samples that need to be evaluated to determine their tensile properties.
Why is ASTM D1708 Important for Tensile Evaluation?
The standard provides a reliable method for determining the mechanical characteristics of small plastic samples that are not suitable for conventional tensile testing. Accurate tensile data support material selection, improve product reliability, optimize manufacturing processes, strengthen engineering design, and reduce the risk of material failure in critical applications.
ASTM D1708 Equipment and Sample Preparation Guide
It is imperative to do proper specimen preparation and to use calibrated tensile test equipment to obtain accurate and repeatable mechanical property results.
Specimen Details
Representative specimens are rectangular microtensile bars that have a reduced gauge section to ensure that the specimen is under uniform stress when it is tested.
Specimen Preparation
Technicians precision-machine the specimens to the required dimensions, condition them under controlled temperature and humidity, and inspect them for defects before testing.
Specimen Dimensions
Technicians prepare specimens with a length at least three times the width, a thickness of about 1 mm, and a narrowest cross section of about 5 mm long by 1 mm wide.
Instrumentation
Typical equipment consists of a universal testing machine, precision microtensile grips, load cell, extensometer or measurement of displacement apparatus, computer data acquisition software, and specimen alignment fixtures.
Testing Procedures and Requirements for Microtensile Testing
The tensile properties of plastic materials are measured using the test by applying a controlled tensile load to a microtensile specimen until it fails. Laboratory standard procedures give consistent, repeatable, and comparable mechanical property data.
Specimen Preparation
Technicians precision-machine the microtensile specimens to the required form and expose them to the specified environmental conditions before testing.
Specimen Installation
Technicians carefully load the specimen into a universal testing machine using specialized grips and position it to minimize misalignment and stress concentrations.
Tensile Loading
Technicians apply a controlled crosshead movement rate and record the force and crosshead displacement until the specimen fails.
Data Acquisition
Technicians measure the tensile load, displacement, stress, strain, elongation, and other mechanical parameters during the test.
Mechanical Property Calculation
Analysts use the test results to determine tensile strength, modulus of elasticity, elongation at break, and other tensile properties.
Result Analysis
Analysts characterize the mechanical properties and compare them with engineering specifications and material properties.
Documentation and Reporting
Laboratory personnel document the specimen dimensions, testing conditions, calculated mechanical properties, failure observations, and ASTM D1708 test results in laboratory reports.
ASTM D1708 Testing Process and Data Collection
Testing begins with manufacturing and conditioning representative microtensile specimens to the required dimensions and specifications. Each specimen is carefully positioned in special grips to allow proper alignment before a controlled tensile load is applied until fracture occurs. The test continuously measures tensile load, displacement, stress, strain, and elongation. The data gathered is evaluated for tensile strength, modulus of elasticity, elongation at break, and other mechanical properties per ASTM D1708 reporting.
ASTM D1708 Universal Testing Machine (UTM)
Common Challenges and Troubleshooting
Misalignment, improper gripping, defects produced during specimen machining, inaccurate specimen dimensions, stress concentration, or equipment calibration problems may lead to unreliable tensile measurements. Routine equipment calibration, precision alignment, specialized gripping systems, and careful specimen preparation help to guarantee accurate, repeatable test results.
Analysis Results and Interpretation
The results are usually expressed in terms of tensile strength, modulus of elasticity, elongation at break, etc.
A higher tensile strength means that it is stronger against tensile forces.
Modulus of elasticity gives clues to the stiffness and behavior of deformation of the material.
Elongation at break is a measure of a material’s ability to stretch before it breaks.
The results are checked against the engineering specifications and the material requirements for product suitability.
What are the Factors to Consider for ASTM D1708 Testing?
Expertise: Skilled laboratory personnel are required to prepare microtensile specimens, align specimens accurately, operate precision testing equipment, and interpret tensile property data.
Speed: Tests are usually completed within a short time after the preparation, conditioning, and proper installation of specimens.
Cost: Testing costs depend on the number of properties tested, specimen preparation, equipment requirements, and the complexity of the testing program.
Confidentiality: Matestlab maintains complete confidentiality in the testing process, and results are carefully disclosed to the respective stakeholders only.
Rohit Dhembare is an Operations Associate at MaTestLab Inc. and holds a postgraduate degree in Organic Chemistry.
FAQ's
Where can I get the astm d1708 tested?
You can share your astm d1708 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 d1708 test to various testing techniques.
How much do I need to pay for the astm d1708 test?
Please contact us for a detailed quote for your astm d1708 testing needs. Cost incurred to carry out different astm d1708 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 d1708?
The required number of samples or specimens should comply with the procedure given in the astm d1708 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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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 d1708 test?
The turnaround time for astm d1708 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 d1708 tested?
You can share your astm d1708 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 d1708 test to various testing techniques.
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