Kalsi Seal Material Options

The materials used to manufacture Kalsi-brand rotary shaft seals are identified by the “Dash Numbers” shown in the tables below. The part number of most Kalsi Seals® is comprised of the basic part number and a material dash number. For example, the seal part number 507-5-11 includes the basic part number “507-5” and the HNBR seal material dash number “-11”.

Standard HNBR Seal Materials

Our -10 and -11 HNBR seal materials are the most common materials used to manufacture single-material Kalsi Seals because of their good overall balance of characteristics, such as abrasion, chemical, and compression set resistance. To learn more about HNBR seal materials, see Chapter B2 of our seal handbook.

Material Dash No. Material Name Material Hardness, Shore A Durometer
-10 HNBR (HSN) 80 ± 5
-11 HNBR (HSN) 85 to 92

HNBR Seal Material Combinations for Dual Durometer Seals

Dual Durometer seal material

Dual Durometer™ seal construction involves using two different seal materials to manufacture a seal. The dynamic sealing lip is made from a harder seal material, and the outer part of the seal is made from a softer seal material. This construction method provides reduced contact pressure with the shaft and reduced torque and seal generated heat compared to a seal made solely from the harder seal material, while providing more extrusion resistance than a seal made solely from the softer seal material.

Dual Durometer HNBR seal material combinations are shown in the table below. The -106 material combination is often selected because of the excellent extrusion resistance provided by the 90 Shore A HNBR inner seal material and the reduced contact pressure provided by the 70 Shore A outer seal material. We consider our -114 material combination to be our best dual durometer option for high pressure extrusion resistance. To learn more about dual durometer construction, see Chapter C8 of our seal handbook.

Material Dash No. Inner Lip Hardness, Shore A Outer Lip Hardness, Shore A
-100 80 ± 5 65 ± 5
-101 85 to 92 65 ± 5
-102 90 ± 5 65 ± 5
-104 80 ± 5 70 ± 5
-105 85 to 92 70 ± 5
-106 90 ± 5 70 ± 5
-107 95 ± 5 70 ± 5
-108 80 ± 5 75 ± 5
-109 85 to 92 75 ± 5
-110 90 ± 5 75 ± 5
-112 85 to 92 80 ± 5
-113 90 ± 5 80 ± 5
-114 95 ± 5 80 ± 5
-115 95 ± 5 85 to 92

Plastic Lined Kalsi Seals

BDRP Rotary Shaft Seal

Several types of Kalsi Seals, including Plastic Lined Kalsi Seals and BDRP™ seals, incorporate a plastic inner layer for high pressure extrusion resistance. The available material combinations for Plastic Lined Kalsi Seals are shown in the table below. BDRP seals use our most pressure-capable -318 material construction.

Inner Lip Outer Lip
Dash No. Inner Lip Dash No. Outer Lip Dash No. Compound Name Durometer, Shore A
-303 -32 -11 HNBR 85 – 92
-307 -33 -10 HNBR 80 ± 5
-308 -33 -11 HNBR 85 – 92
-318 -35 -11 HNBR 85 – 92

Special Purpose / Special Order Seal Materials†

The following table shows special order seal materials for Kalsi-brand rotary shaft seals. Of these materials, the -30 and -31 materials are the most popular because of their hardness range, elevated temperature capability, and chemical resistance characteristics. To learn more about these elastomers, see the “Elastomer Materials” section of our seal handbook.

Material Dash No. Material Name Material Hardness, Shore A Durometer
-2 FKM 70 ± 5
-4 FKM 80 ± 5
-6 FKM 90 ± 5
-7 FEPM (TFEP) 70 ± 5
-8 FEPM (TFEP) 80 ± 5
-12 EPDM 80 ± 5
-13 EPDM 90 ± 5
-14 HNBR (HSN) 70 ± 5
-15 HNBR (HSN) 90 ± 5
-16 HNBR (HSN) 75 ± 5
-30 FKM 80 ± 5
-31 FKM 85 to 92

† The molding shrink rates of the FKM and TFEP materials may differ from the shrink rate of the standard HNBR seal materials.  Shaft and groove dimensions may require adjustment accordingly, particularly with larger diameter seals. Call for additional information.