Ultra Light Duty ST Wear Strip | Kamatics | Kaman Specialty Bearings

Ultra-Light Duty ST Wear Strip

Ultra-Light Duty ST Wear Strip has a unique thin cross section, which makes it ideal for aerospace surface applications that require an extremely low profile or high flexibility. The ST Wear Strip is Comprised of PTFE & other synthetic fibers. The mating sliding material should be smooth, hard, and corrosion resistant surface. For improved Ultra-Light Duty ST Wear Strip performance, the sliding component should have a minimum surface roughness of 16 RMS (0.4 μm), and be in full contact with the Ultra-Light Duty Wear Strip to avoid line or point loads.

Ultra-Light Duty ST Wear Strip is available in a standard thickness of 0.11” ± .003” (.28mm ± .076). Similar to the KAron V and P54 wear strips, the Ultra-light duty wear strip can be cut into narrow strips and custom shapes. Kamatics recommends a surface finish of 16 RMS (0.4 μm) or better and a hardness of 30 HRC or better for the mating surface.

Physical properties of the self-lubricating wear strip include:

Compressive Strength 20,000 psi 138 MPa
Operating Temperature -65°F to 250°F -54°C to 120°C
Maximum Dynamic Load 10,000 psi 69 MPa
Coefficient of Frication 0.04 - 0.10, depending on load, speed, temperature, and mating surface condition

 

Kamatics Ultra-Light Duty ST Wear Strip is applied by adhesive bonding onto a suitable substrate. It comes with a removable protective film applied to the bonding surface of the material. The running surface of the ULDST has a dark brown color, while the bonding surface has a lighter brown/olive green color (when the protective backing is removed). The mating surface should be roughened to a finish of greater than 63 rms (1.6 μm), or as recommended by the selected adhesive’s manufacturer. Both surfaces to be bonded should be cleaned with an appropriate solvent (e.g. isopropyl alcohol) immediately prior to bonding.

Standard room-temperature curing structural epoxy adhesives are recommended for bonding Ultra-Light Duty Wear Strip material, such as Hysol EA9309, Hysol EA9396 (Henkel Loctite Aerospace), Hysol EA9460 (Henkel Loctite Industrial), Scotchweld 460 (3M Co.), and Araldite 2011 (Huntsman).

For standard cut strip dimension parts, Kamatics uses the below part numbering system.

KWU ___ ___ ___ ___ __ ___ ___ ___ __ ___ ___ ___
ULDST Wear Strip Unit of Measure Wear Strip Grade   Width   Length

 

Unit of Measure = BLANK for English units
M for metric units
Wear Strip Grade = See Wear Strip Grade table above
Width = English units: width in 1/8" increments up to 12", example 024 = 3" wide
Metric units: width in 5mm increments up to 300mm, example 020 = 100mm wide
Length = English units: length in 1/4" increments up to 48", example 096 = 24" long
Metric units: length in 10mm increments up to 1200mm, example 050 = 500mm long

 

ULDST wear strips are not affected by the following chemicals and contaminants: Phosphate Ester Hydraulic Fluid (Skydrol), MIL-T-5624 Turbine Fuel Grade JP-4, MIL-L-7808 Lubricating Oil, MIL-H-5606 Hydraulic Oil, MIL-A-8243 Anti-Icing Fluid, MIL-H-83282 Hydraulic Fluid, Fresh Water, Salt Water.

The wear strip materials performed very well in independent laboratory testing. The methods used for the testing were MIL-STD-810F Environmental Engineering Considerations and Telecordia General Requirements. When subjected to tests for High and Low Temperatures, Solar Radiation, Blowing Rain, Fungus, Humidity, Salt Fog, Blowing Dust, Functional Shock, and Ozone Resistance, the Kamatics wear strip material test samples showed no signs of damage or degradation.