Polystrat SP38-21 is a noise absorbing shim material for disc brakes.

Hard Steel shim with temperature- and pressure resistant rubber coating. Both sides with non-stick coating and perfect damping performance with better piston penetration.

Produced with a hard steel this material has a scratch-resistant non-stick coating, a temperature and pressure-resistant rubber coating, one-sided pressure sensitive adhesive coating and release paper to give excellent durability and damping performance.

Basis composition

NBR/Carbon Steel/NBR


Black - Other per request.


Roll length up-to 500 m


Up-to 500 mm

Composite and tolerances

Non-stick coating 0.010 ± 0.005 mm

Rubber, NBR 0.100 ± 0.010 mm

Cold rolled carbon steel 0.380 ± 0.020 mm

Rubber, NBR 0.100 ± 0.010 mm

PS-adhesive, acrylic 0.080 ± 0.010 mm

Release paper, siliconized 0.100 ± 0.020 mm

Total without release paper 0.660 ± 0.0550 mm


Areas of application

Brake systems OE / OES / Aftermarket

Typical technical data and Properties for KLINGER® Polystrat

Max. creep relaxation



Adhesive bonding strength to the steel plate SAFT
To steel plate
≥ 3
Bonding conditions Shim connection
Temperature of back plate
Pressure time

°C MPa s

≥ 20 2-3 5

Rubber hardness

Shore A ISO 7619-1   70-75
Compression ISO 815-1 % 25-27
Corrosion EKB 1102 Grade 0

Storage life (Higher storage temperature and or longer storage time may cause a quality decrease of the product)

DIN 7716 Months 24

This information are based upon test results, but does not constitute a guarantee or warranty. The buyer must determine the suitability of the product for its purposes independently. In presenting possible uses for this product, no attempt has been made to investigate possible patent infringements. Therefore, the data may not, be used to support any warranty claims. This edition cancels all previous issues. Subject to change without notice.


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