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FFKM Clamp Gaskets 

For the highest chemical resistance available in an elastomeric gasket, choose DuPontTM Kalrez® Gaskets.

Kalrez® LS390 Perfluoroelastomer Gaskets Provide Premium Performance

  • DuPont™ Kalrez® LS390 perfluoroelastomer FFKM clamp gaskets' material is a grey product used for making sanitary seals for food handling, beverage, and pharmaceutical applications.  Its distinct color when used in high purity industries makes DuPont™ Kalrez® LS390 perfluoroelastomer seals easily recognized.
  • Problems experienced in FFKM sanitary seal applications are usually related to thermal and chemical resistance, compression set (permanent deformation) and high static friction (stiction). Kalrez® LS390 has been designed to address these issues by offering high hardness properties, low stiction, temperature resistance up to 428°F (220°C) and excellent chemical resistance to process chemicals

Kalrez® LS390 Sanitary Gaskets are used to manufacture food, beverages and biopharmaceuticals requiring the highest levels of product purity. At the same time, they minimize process downtime and maintenance costs.

The Kalrez® LS390 Sanitary Gasket is a prefabricated seal that provides the cleanliness and chemical resistance of PTFE with the elastic memory of an elastomer. It was designed to meet the stringent requirements of ASME BPE for clamp connections used in biopharmaceutical applications. Kalrez® LS390 material minimizes what can be absorbed by or extracted from the gasket and will not impart flavor to the product. This translates into a pure process and a long seal life!

Kalrez® LS390 Material Properties (1)
Color Grey
Shore A3 Durometer, points 88
Tensile Strength (4), psi (MPa) 2697 (18.60)
Ultimate Elongation (4) % 147
100% Modulus, psi (MPa) 1618 (11.16)
Compression Set5 %, 70 hrs. at 392°F (200°C) 30
Max Operating Temperature (2) °F (°C) 428°F (220°C)

Thermal and chemical resistance challenges and compression set (permanent deformation) can cause intrusion wherever a gasket is used. This increases the risk of contamination or leakage unless seals are continually tightened. Kalrez® LS390 has been designed to address these issues by a formulation that offers temperature resistance up to 220°C (428°F) and excellent chemical resistance (Tables 1 and 2).

In biopharmaceutical applications, Kalrez® LS390  may be used in WFI (water for injection), as well as SIP and/or CIP processes. Choosing Kalrez® with its enhanced properties helps the engineer achieve increased MTBR (Mean Time Between Repair), saving time, money and trouble.

Sizes, Packaging and Availability and Compliance

Kalrez® LS390 Sanitary Clamp gaskets are supplied in individual bags, bar coded for full traceability. Kalrez® LS390 parts comply with the requirements of the U.S. FDA regulation 21 CFR 177.2600, the extractive limitations of 21 CFR 177.2400, as well as USP <87> and USP <88> Class VI requirements for biocompatibility. Kalrez® LS390 parts also meet Japan Pharmacopeia, edition 16.

Kalrez® LS390 clamp gasket size table
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Newman Sanitary Gasket Company is a leading manufacturer of FDA and USP Class VI seals for High Purity Process applications such as the Pharmaceutical, Food & Beverage and Dairy industries. Newman Diaphragms provides world class replacement diaphragms for ITT®, Gemü®, Saunders® and Aquasyn® valves.

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