iso 815 tes standard expalined

Home > Resources > Plastic Material Properties > Elastomers ISO 815 Test Standard Explained Compression Set ISO 815 The permanent deformation remaining after release of a compressive stress. Compression set is expressed as the percentage of the original deflection. Compression set is an important property for elastomers and cushioning materials. The test specimen is compressed for a specified time at a specified temperature. Compression set is calculated as the percentage of the original deflection after the material is allowed to recover at standard conditions for 30 minutes. Compression set is calculated using the formula: C = [(h h ) / (h h )] * 100 where h is the original specimen thickness, h is the specimen thickness after testing, and h is the spacer thickness. Compression Set Testing Three different strains may be used for testing. The strain used depends upon the hardness of the material. IRHD stands for International Rubber Hardness Degrees (see ISO 48). Compression Strains % StrainUsage 25 Preferred 15 8089 IRHD 10 9095 IRHD Two different specimens may be used for testing. Test specimens are cylindrical disks cut from a slab of the testing material. Compression Set Specimens Specimen TypeDiameter (mm)Thickness (mm) A 29.0 12.5 B 13.0 6.3 Similar Standards ASTM D395 o i o n o i n About Raw Materials & Ingredients Solid Materials UL is a global independent safety science company offering expertise in certification, validation, testing, inspections, auditing, education and advisory services. Our breadth, established objectivity and proven history mean we are a symbol of trust and enable us to help provide peace of mind to all. Learn More UL and the UL logo are trademarks of UL LLC ©2014 All Rights Reserved.

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3/26/2015 CompressionSetISO815ULIDES

http://www2.ulprospector.com/property_descriptions/ISO815.asp 1/1

Home>Resources>PlasticMaterialProperties>Elastomers

ISO815TestStandardExplainedCompressionSetISO815

Thepermanentdeformationremainingafterreleaseofacompressivestress.Compressionsetisexpressedasthepercentageoftheoriginaldeflection.Compressionsetisanimportantpropertyforelastomersandcushioningmaterials.

Thetestspecimeniscompressedforaspecifiedtimeataspecifiedtemperature.Compressionsetiscalculatedasthepercentageoftheoriginaldeflectionafterthematerialisallowedtorecoveratstandardconditionsfor30minutes.Compressionsetiscalculatedusingtheformula:C=[(h h )/(h h )]*100whereh istheoriginalspecimenthickness,h isthespecimenthicknessaftertesting,andh isthespacerthickness.

CompressionSetTestingThreedifferentstrainsmaybeusedfortesting.Thestrainuseddependsuponthehardnessofthematerial.IRHDstandsforInternationalRubberHardnessDegrees(seeISO48).

CompressionStrains%StrainUsage

25 Preferred15 8089IRHD10 9095IRHD

Twodifferentspecimensmaybeusedfortesting.Testspecimensarecylindricaldiskscutfromaslabofthetestingmaterial.

CompressionSetSpecimensSpecimenTypeDiameter(mm)Thickness(mm)

A 29.0 12.5B 13.0 6.3

SimilarStandardsASTMD395

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