Why Tear strength of silicone rubber is a critical and functional property in Gaskets used in Hot air ovens, door gaskets?
Why Tear strength of silicone rubber is a critical and functional property in Gaskets used in Hot air ovens, door gaskets?
Silicone gaskets are the preferred gasket for hot air ovens especially ovens used in food industry, it can withstand continuous working temperature of 210 degree Celsius and upto 240 degree Celsius for shorter dwell time. We have special grades that can withstand working temperatures of 280 degree Celsius ++ but will be made against the pre order.
But are you facing the issue of tearing or cutting of the gasket? or losing the compression property after a period? Are the gasket gets deformed easily? Causing power loss, material loss, production breakages? At high temperatures silicone rubber will have a slighter change in the tensile, elongation and tear strength, if you choose a low-quality filler general purpose silicone gasket over a high tear, high temperature silicone gasket this happens. The fillers used in silicone can be precipitated, fumed, aluminum trihydrate etc, and each would give a different cost and performance.
Tear strength is the maximum force required to cause a nick or cut or rupture in a test specimen as per standard(like ASTM, ISO) to tear the rubber then divided by the thickness of the specimen.
Tear Strength T= Maximum Force in N/ Median Thickness in mm
The specimens are prepared in special standard molds with uniform thickness, curing without even a pinhole, zero surface issue to get the accurate results. Different specimens like Type A, B, C, T, CP etc. can be used to check different type of tear strength and should be mentioned separately as each value differ from one another. The specimens are conditioned in optimum temperature and placed between the grips of calibrated UTM and tear test is conducted. Our machine automatically calculates and displays the results and you can even take a printout or keep a pdf. The detailed process, procedure and analysis has been mentioned in the ASTM, ISO relevant paper which can be referred.
We chose high tear strength material with tear strength above 20 N/mm , Tensile Strength above 8 Mpa (8 N/mm2) so that at even at high temperature a 5% change decrease in the tensile and tear strength will not tear, cut or deform the gasket. We follow the ASTM standard ASTM D 624 to evaluate tear strength of vulcanized rubber and thermoplastic elastomers, with Die A, B and C for the comparison and performance check.
We need to know about the type of gasket you are looking for like omega, p, e, D, T, H ,bulb, square, rectangular, Double P, Triangular and any custom shape is possible. We have gaskets with adhesive backing which can be installed without the use of any other sealants, but make sure the peel strength required matches your application.
Contact us here to know more and share your sealing question, we are free to assist.
Also please visit our online shop to check whether you have matching gaskets.
Silicone gaskets are the preferred gasket for hot air ovens especially ovens used in food industry, it can withstand continuous working temperature of 210 degree Celsius and upto 240 degree Celsius for shorter dwell time. We have special grades that can withstand working temperatures of 280 degree Celsius ++ but will be made against the pre order.
But are you facing the issue of tearing or cutting of the gasket? or losing the compression property after a period? Are the gasket gets deformed easily? Causing power loss, material loss, production breakages? At high temperatures silicone rubber will have a slighter change in the tensile, elongation and tear strength, if you choose a low-quality filler general purpose silicone gasket over a high tear, high temperature silicone gasket this happens. The fillers used in silicone can be precipitated, fumed, aluminum trihydrate etc, and each would give a different cost and performance.
Tear strength is the maximum force required to cause a nick or cut or rupture in a test specimen as per standard(like ASTM, ISO) to tear the rubber then divided by the thickness of the specimen.
Tear Strength T= Maximum Force in N/ Median Thickness in mm
The specimens are prepared in special standard molds with uniform thickness, curing without even a pinhole, zero surface issue to get the accurate results. Different specimens like Type A, B, C, T, CP etc. can be used to check different type of tear strength and should be mentioned separately as each value differ from one another. The specimens are conditioned in optimum temperature and placed between the grips of calibrated UTM and tear test is conducted. Our machine automatically calculates and displays the results and you can even take a printout or keep a pdf. The detailed process, procedure and analysis has been mentioned in the ASTM, ISO relevant paper which can be referred.
We chose high tear strength material with tear strength above 20 N/mm , Tensile Strength above 8 Mpa (8 N/mm2) so that at even at high temperature a 5% change decrease in the tensile and tear strength will not tear, cut or deform the gasket. We follow the ASTM standard ASTM D 624 to evaluate tear strength of vulcanized rubber and thermoplastic elastomers, with Die A, B and C for the comparison and performance check.
We need to know about the type of gasket you are looking for like omega, p, e, D, T, H ,bulb, square, rectangular, Double P, Triangular and any custom shape is possible. We have gaskets with adhesive backing which can be installed without the use of any other sealants, but make sure the peel strength required matches your application.
Contact us here to know more and share your sealing question, we are free to assist.
Also please visit our online shop to check whether you have matching gaskets.
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