Rubber Coverings, Molded Parts, Custom Grinding, Specialty Rubber Fabrication
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Employee working with Roller Material

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Employee working with Roller Material

Materials and Reference Chart

Our customers benefit from our 50 years experience in the rubber industry. Our custom compounds have been developed by our staff and proven in countless service applications. Continual material development keeps us in the forefront of material performance.

We have many durometers, colors and compound alternatives to meet your requirements; or we can formulate new or adjust an existing stock to specifically fit your application, without a lot of development costs.

  • Natural Rubber
  • Neoprene
  • Silicone
  • Hypalon
  • Viton
  • EPDM
  • ECH
  • SBR
  • XNBR
  • ASTM
  • HNBR
  • Butyl
  • Ebonite
  • Sponge grades
  • Static conductive
  • Thermal conductive
  • Dual durometer
  • Constructions
  • MSHA
  • FDA
Material Varieties
Material Varieties

Harwood Rubber Products

Reference Chart

General Reference Chart of materials available, their respective hardness range and temperature capacity:

MATERIAL
TEMPERATURE (Fahrenheit)
HARDNESS (SH. “A” Durometer)
Butyl (IIR)
212
50-75
Epichlorohydrin (CO/ECO)
275
45-75
Ethylene Propylene (EPDM/EPT)
350
35-90
Neoprene (CR)
250
15-95
Nitrile (NBR)
250
20-100
Carboxylated Nitrile (XNBR)
275
50-95
Hydrogenated Nitrile (HNBR)
300 (Interm. to 400)
55-95
Isoprene/Natural (IR/NR)
190
35-100
Styrene Butadiene (SBR)
200
45-90
Silicone (SI)
450
25-85
Viton (FPM)
475
60-85
Hypalon (CSM)
275
45-90
Urethane (AU/EU)
180
35-100

The above temperature ratings are for general reference only and may vary from compound to compound. Factors such as material hardness, formulation, chemical environment, working load, size tolerance (stability), etc. may affect individual materials differently. Accordingly, specific requirements should be addressed as such.

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