Sealing materials perform well in hygienic couplings

Sealing materials perform well in hygienic couplings

Sealing materials perform well in hygienic couplings

New sealing materials engineered for hygienic-design couplings by Trelleborg Sealing Solutions are proven in tests to give exceptional performance

Materials engineered by Trelleborg Sealing Solutions for its new range of static seals for hygienic-design couplings are proven in tests to give outstanding performance. In particular, a newly developed FKM gives unrivalled results for a Fluorocarbon sealing material. Volume swell in all CIP media was minimal and in some virtually zero, indicating that the compound will give long-term sealing integrity for gaskets and O-Rings in pipe couplings.

Image shows a hygienic-design coupling with seal

The materials engineered by Trelleborg Sealing Solutions for its new range of static seals for hygienic-design couplings have undergone extensive testing in commonly used Cleaning-In-Process (CIP) media. The tests prove that the materials are well-suited to these applications. In particular, Ethylene Propylene Diene Monomer (EPDM) E7502 and Fluorocarbon (FKM) V8T41 gave best-in-class results for their material types with V8T41 demonstrating exceptional performance for a fluorocarbon sealing material.

New materials suitable for use with most CIP media

The three materials recommended for hygienic-design couplings, EPDM E7502 and FKMs V8605 and V8T41, underwent various tests, one of which was immersion in 21 commonly used CIP fluids. After this the sealing materials were measured for volume swell, a critical determinant of long-term sealing integrity. In all cases but one the volume change of the materials was well below ten percent, the percentage of volume swell that is deemed allowable in such applications. In fact, in most CIP media the change was less than five percent, the percentage of volume swell that is deemed perfectly acceptable in such applications.

Graph shows results of tests on materials engineered for hygienic-design coupling

The FKM V8T41 gave the best overall performance and one which is exceptional for a Fluorocarbon sealing material. In the demanding conditions created by a combination of a two percent solution of acidic acid, citric acid and formic acid at +60°C/ +140°F, volume swell of V8T41 was well below five percent. In a one percent concentration of acidic CIP media with oxygen at +40°C/ +104°F, virtually no swell was recorded. In addition, the material is also suitable for hot water and steam applications up to 170°C/ 338°F.

Compounds contribute to lowering overall production costs

“These results enable Trelleborg Sealing Solutions to give qualified advice and to recommend the optimum material for specific customer applications,” says Ferdinand Schwabe, the pharmaceutical, food and beverage Segment Manager for Europe. “Based on our tests we are confident that our new range of static seals for hygienic-design couplings in recommended materials will give long-term sealing integrity. This will contribute to a lower meantime between planned maintenance and overall production costs for users.”

Image shows typical hygienic coupling

Recommended materials for the Trelleborg Sealing Solutions range of static seals for hygienic-design couplings are:

EPDM E7502 has high chemical resistance, giving it long life in polar solvents, steam and hot water along with suitability for contact with alkaline cleaning fluids. Tests prove it to be a good all round material including in Water-for-Injection (WFI) applications at high temperatures.

FKM V8605 is specially suited to processes with high temperatures or where there is contact with high-fat media such as edible oils or cosmetics, or in processes where lubrication with grease or mineral-based oils is required.

FKM V8T41 has superior hot water and steam resistance up to 170°C/ 338°F, making the material especially suitable for use in heat exchangers or other Ultra-High Temperature processing (UHT) equipment. It also gives high performance in contact with dry and liquid products in the meat, poultry and dairy industries, as well as in pharmaceutical and bioprocessing equipment.

All of these materials are compliant to and tested against FDA, 21 CFR177.2600, 3-A, USP Class VI, as well as against cytotoxicity (USP and DIN EN ISO 10993-5) and conform to regulation (EC) 1935-2004. Gaskets and O-Rings are supplied in sizes specified by ISO 2852, DIN 11864 and DIN 32676 along with custom-made configurations.

For further information:

Go to our web page on static seals for hygienic-design couplings

Download our catalog on static seals for hygienic-design couplings

An addition to the static seals for hygienic-design couplings we have a range of specialized sanitary gaskets.

Find out more about our range of sanitary gaskets