Compression Set (CS)

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“We have been working with you since more than 10 years. During this period your quality & delivery performance found is very good. Even when we arranged a supplier meet in 2012 we awarded you as a best supplier of the year in Bought out item category. Whenever we had any new developments your support was perfect. Overall your performance was very good & we hope the same in future too, We wish you all the best for your business growth.”
Sidel India Pvt. Ltd.
“We are working with Harkesh Rubber since 3 years. Our initial development of few seals for one of the important project developed and supplied by them as per the schedule. We found the quality and commitment for overall business is good. The response and technical support for our need is fair and on-time. Overall the services and co-operation found to be satisfactory. We wish the young and energetic Harkesh Rubber team a very best in all the future endeavours.”
Festo India Pvt Ltd.
“Harkesh Rubber Industries has been our co-partner for the supply of the rubber and its allied products from past 2 years which we used in our daily final product made for Indian Railways. We find the quality of product supplied by them in superior quality which lowest lead time. Overall the services and cooperation found out to be satisfactory in all key areas.”
Crompton Greaves Limited
“Harkesh Rubber Industries has been our co-partner for the supply of the rubber and its allied products from past 2 years which we used in our daily final product made for Indian Railways. We find the quality of product supplied by them in superior quality which lowest lead time. Overall the services and cooperation found out to be satisfactory in all key areas.”
Crompton Greaves Limited
“In all honesty I have to say that for us it's really a pleasure to do business with you now already more than 5 years. In the whole time you had never let us down, your delivery performance is nearly perfect, the service which we get is quicker than quick. The product quality has been never a problem and when we had an issue you help us always to solve it. This reliability is where we trust in and what makes our decision to work with you also in the future very easy.”
ARCA Regler GMBH
“Dear Harkesh Rubber Team, We have been working with you since last 6 years. During this period your Quality, Delivery and Performance found very good and consistent. During the development of new products specially FKM/FPM gaskets, we had very good technical support by your team, and we hope in future it will remain same. We wish you all the best for your business growth. Thanking you,”
Georg Fischer Piping Systems Pvt. Ltd.

Compression Set (CS)

The Compression Set of elastomers is the deformation that remains when the applied force is removed. When elastomers are compressed over a period of time, they cannot retain their initial thickness.

CS tests can measure the ability of a rubber sample to return to its initial thickness after compression pressure is applied at a set temperature and deflection.

Importance

CS is important for sealing functionality and achieving long term sealing. CS measurements are also critical to determine the quality of the elastomeric material. Take the example of a shock isolation pad, where the ability to protect a dropped unit could be compromised as the CS measurement becomes more important.

Compression Set Measurement

A rubber sample that has zero CS will return to 100% of its initial thickness, whereas the sample that has 100% CS is the one that does not return to its initial thickness.

The CS (ASTM D395) of a sample is determined by using one of two tests.

1) Test Method A

CS under continuous force in the air usually applies 1.8kN force to the sample for a set temperature and time.

2) Test Method B

CS under continuous deflection in the air can compress the sample to 25% of its initial height for a set temperature and time.

CS tests A and B can be defined as the percentage of initial sample thickness after it has been subjected to normal conditions for at least 30 minutes.

O-ring CS testing is conducted using the ASTM D1414 B method.

Calculating Compression Set

Measuring the CS for a sample can be achieved using specific formulae, ideal for each testing method.

O-ring CS testing is conducted using the ASTM D1414 B method.

1) Test Method A

CA = [(to – ti) / to] * 100
Where,
CA – Compression set A
to – Initial sample thickness
ti – Sample thickness after testing

2) Test Method B

CB = [(to – ti) / (to – tn)] * 100
Where,
CB – Compression set B
to – Initial sample thickness
ti – Sample thickness after testing
tn – Sample thickness during testing

Compression Set (CS)

The Compression Set of elastomers is the deformation that remains when the applied force is removed. When elastomers are compressed over a period of time, they cannot retain their initial thickness.

CS tests can measure the ability of a rubber sample to return to its initial thickness after compression pressure is applied at a set temperature and deflection.

Importance

CS is important for sealing functionality and achieving long term sealing. CS measurements are also critical to determine the quality of the elastomeric material. Take the example of a shock isolation pad, where the ability to protect a dropped unit could be compromised as the CS measurement becomes more important.

Compression Set Measurement

A rubber sample that has zero CS will return to 100% of its initial thickness, whereas the sample that has 100% CS is the one that does not return to its initial thickness.

The CS (ASTM D395) of a sample is determined by using one of two tests.

1) Test Method A

CS under continuous force in the air usually applies 1.8kN force to the sample for a set temperature and time.

2) Test Method B

CS under continuous deflection in the air can compress the sample to 25% of its initial height for a set temperature and time.

CS tests A and B can be defined as the percentage of initial sample thickness after it has been subjected to normal conditions for at least 30 minutes.

O-ring CS testing is conducted using the ASTM D1414 B method.

Calculating Compression Set

Measuring the CS for a sample can be achieved using specific formulae, ideal for each testing method.

O-ring CS testing is conducted using the ASTM D1414 B method.

1) Test Method A

CA = [(to – ti) / to] * 100
Where,
CA – Compression set A
to – Initial sample thickness
ti – Sample thickness after testing

2) Test Method B

CB = [(to – ti) / (to – tn)] * 100
Where,
CB – Compression set B
to – Initial sample thickness
ti – Sample thickness after testing
tn – Sample thickness during testing

NEED HELP?

Speak with a human to filling out a form? call corporate office and we will connect you with a team member who can help.

“We have been working with you since more than 10 years. During this period your quality & delivery performance found is very good. Even when we arranged a supplier meet in 2012 we awarded you as a best supplier of the year in Bought out item category. Whenever we had any new developments your support was perfect. Overall your performance was very good & we hope the same in future too, We wish you all the best for your business growth.”
Sidel India Pvt. Ltd.
“We are working with Harkesh Rubber since 3 years. Our initial development of few seals for one of the important project developed and supplied by them as per the schedule. We found the quality and commitment for overall business is good. The response and technical support for our need is fair and on-time. Overall the services and co-operation found to be satisfactory. We wish the young and energetic Harkesh Rubber team a very best in all the future endeavours.”
Festo India Pvt Ltd.
“Harkesh Rubber Industries has been our co-partner for the supply of the rubber and its allied products from past 2 years which we used in our daily final product made for Indian Railways. We find the quality of product supplied by them in superior quality which lowest lead time. Overall the services and cooperation found out to be satisfactory in all key areas.”
Crompton Greaves Limited
“Harkesh Rubber Industries has been our co-partner for the supply of the rubber and its allied products from past 2 years which we used in our daily final product made for Indian Railways. We find the quality of product supplied by them in superior quality which lowest lead time. Overall the services and cooperation found out to be satisfactory in all key areas.”
Crompton Greaves Limited
“In all honesty I have to say that for us it's really a pleasure to do business with you now already more than 5 years. In the whole time you had never let us down, your delivery performance is nearly perfect, the service which we get is quicker than quick. The product quality has been never a problem and when we had an issue you help us always to solve it. This reliability is where we trust in and what makes our decision to work with you also in the future very easy.”
ARCA Regler GMBH
“Dear Harkesh Rubber Team, We have been working with you since last 6 years. During this period your Quality, Delivery and Performance found very good and consistent. During the development of new products specially FKM/FPM gaskets, we had very good technical support by your team, and we hope in future it will remain same. We wish you all the best for your business growth. Thanking you,”
Georg Fischer Piping Systems Pvt. Ltd.
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