Test C - Compression Force Deflection (CFD)
Compression force deflection measures the force necessary to produce a 50 % compression over the entire top area of the foam specimen. The standard specimen for this test is 50mm X 50mm X 25 mm thick or larger. 3 samples are required. Use our G223 Spherical Seat Compression Platen for this test.

Test Procedure

• Measure the specimen thickness.

• Place the specimen on the lower support platen in the compression tester.

• Preflex the specimen by twice lowering and raising the upper platen to 75-80% of the original thickness at a rate of 250 mm per minute.

• Allow the specimen to rest for 6 minutes with the platen not contacting the specimen.

• Bring the upper compression platen down into contact with the specimen to a load of 140 Pa.

• Compress the specimen 50% of this thickness at 50 mm per minute.

• Determine the final force and displacement after 60 seconds.

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