astm d695 animatedASTM D695 is used to determine the compressive strength of rigid unreinforced and reinforced plastic. The specification was put in place to ensure that consumers are getting what they pay for when they purchase a product. Whether it be for food, beauty products, toys, or anything else, this test helps ensure the quality of the product. 

What Does ASTM D695 Measure?

ASTM D695 measures the compressive properties of rigid plastics including high modulus composites. It is a companion plastics test method to its tensile test standard equivalent, ASTM D638.

Key ASTM D695 test measurements include:

  • Compressive modulus of elasticity
  • Yield stress
  • Deformation beyond yield point
  • Compressive strength

ASTM D695 Test Systems

Test samples are end loaded in compression using low test speeds. A universal test machine with constant rate of crosshead displacement is commonly configured with ASTM D695 test fixtures. Depending on the maximum expected forces, either a single column or dual column universal testing machine works. Complete system includes controller software, load frame and fixtures specifically configured for your test requirements. Our ASTM D695 fixtures are compatible with any brand of test machine. We offer adapters that allow the grips and fixtures to be used on test machines from TestResources, Instron®, MTS®, Tinius Olsen® and every other brand of machine.

ASTM D695 Test Systems

What Are the Fixture Requirements for Rigid Unreinforced Plastics per ASTM D695?

For rigid unreinforced plastics, the test samples for strength measurements are based on right cylinder or prism sample geometries whose length is twice its principle width or diameter. To test this material type and this geometry, the ASTM D695 standard defines the need for a special test fixture,“FIG. 2 Compression Tool”, which corresponds to this compression fixture GD695-813.

What Are the Fixture Requirements for Rigid Reinforced Plastics per ASTM D695?

For reinforced plastics and thin materials (3.2 mm or less), you need an anti-buckling fixture that consists of a set of inserts matching "D695 FIG. 4".

Our G793 plastics compression test fixture has been created for these applications and it offers a modular design that serves multiple applications including the ASTM D695. In fact it can be configured to serve a broad range of polymer matrix composite applications and international test methods involving plastics.

Each G793 fixture configuration is matched to your exact test requirements using different inserts that are compatible with a common carrier. The G793 carrier was developed in support of Boeing’s needs as defined by their Boeing standard BSS 7260, “Advanced Composite Compression Tests”, Boeing document D888-10026. The carrier is now known as a "Modified ASTM D695" which is an improvement over the original D695 “I shaped” lateral support plate. It meets both the ASTM D695 standard and Boeing BSS 7260.

Articles Related to ASTM D695 Plastic Testing

ASTM D695 Testers

240 Family Electromechanical Universal Test Machine

Best Performance - 5 kN (1,125 lbf)

The 240 Family is the ideal solution for a wide range of tests and features higher travel and faster speeds compared to traditional universal test machines. The load frame is compact and lightweight which is great if space is limited. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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311 family Electromechanical Universal Test Machine

Most Versatile - 10 kN (2,250 lbf)

The 311 series tabletop machines are configured to your exact needs including performance, flexibility, simplicity and affordability. This frame is best for smaller loads and a higher speed. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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312 Family Electromechanical Universal Test Machine

Most Versatile - 25 kN (5,500 lbf)

The 312 family tabletop machines are configured to your exact needs including performance, flexibility, simplicity and affordability. This frame is best when you need a higher capacity system for reinforced plastics and composites. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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313 Family Electromechanical Universal Test Machine

Most Versatile - 50 kN (11,250 lbf)

The 313 family tabletop machines are configured to your exact needs including performance, flexibility, simplicity and affordability. This frame is best when you need a higher capacity system for reinforced plastics and composites. Complete system includes controller software, load frame and grips specifically configured for your test requirements.

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ASTM D695 Plastic Compression Fixtures

G223 Spherical Seat Compression Platens

Upper compression platen with fixable integral spherical seat to ensure platen to platen parallelism which is required by ASTM D695

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G23 Compression Platens

Lower rigid compression platen of matching size

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ASTM D695 fixture

ASTM D695 Figure 4 Compression Fixture for Rigid Plastic | GD695-793

Compression anti-buckling fixture for unreinforced plastics. Also compatible to be used for Boeing BSS 7260, ASTM D3846, EN 2850, ISO 14126 - Fig.C2, GOST 9550-81, SACMA-SRM1

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ASTM D695 Strain Measurement for Modulus & Yield Calculations

ASTM D695 Video Extensometer

TestVE - Video Extensometer

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ASTM D695 Deflectometer

ED695-3542 Axial Extensometer

Extensometer with special arms for ASTM D695

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Note: This is not a complete summary of the standard. Anyone planning to conduct this test should read the full standard.