Rubber Compounds

As a leading fabricator, RK Rubber offers a complete range of synthetic rubber materials suited for a variety of applications.

Not all rubber properties are created equal

We strive to provide materials that meet ASTM specifications. In today's global market place, many suppliers falsely position materials that are "designed" to meet specifications. Some products such as commercial-grade neoprene may actually contain little to no neoprene. If material cost is very low, be aware that you are most likely not getting what you really want or need. Watch out for "commodity" grade materials with low-quality physical properties.

RK Rubber integrity

At RK Rubber, we provide only the best rubber compounds sourced from within the U.S. We consult with our customers to understand application use and make the best recommendations based on our expertise.

Neoprene

Neoprene rubber is a general purpose compound that offers oil resistance and has good chemical stability. It is also able to remain flexible over a wide temperature range.

Generally, the many different grades of neoprene have a direct correlation to the actual percentage of neoprene in the compounds.

Elastomer
Neoprene
Color
Black
Durometer
Range
20, 40, 50,
60, 70, 80
Tensile Strength
Range (psi)
800 - 2000
Temperature
Range (Fahrenheit)
-40° to +200°
Elongation
100% - 400%
Thickness
Range (inches)
0.015 - 2

EPDM

EPDM rubber is generally used in applications that require outstanding weather, ozone, or temperature resistance. EPDM also has a great resistance to animal and vegetable oils, and excellent resistance to acids, alkalis, and ketones. EPDM is NOT compatible with petroleum based oils.

Elastomer
EPDM
Color
Black
Durometer
Range
40, 50, 60, 80
Tensile Strength
Range (psi)
800 - 1800
Temperature
Range (Fahrenheit)
-55° to +350°
Elongation
240% - 400%
Thickness
Range (inches)
0.03125 - 0.5

Pure Gum

Natural rubber has excellent physical properties. A true floating stock will have very good tear strength and abrasion resistance. It is also non-marking and non-toxic, and made with FDA ingredients.

Elastomer
Natural Rubber
Color
Tan,
Natural
Durometer
Range
40
Tensile Strength
Range (psi)
3000
Temperature
Range (Fahrenheit)
-20° to +150°
Elongation
600%
Thickness
Range (inches)
0.015 - 1

White Nitrile

White nitrile is manufactured from FDA-approved ingredient, such as food, pharmaceutical, and cosmetic processing. White nitrile offers good abrasion resistance and handles oily and greasy products well.

Elastomer
White Nitrile
Color
White
Durometer
Range
40, 60
Tensile Strength
Range (psi)
1000-1700
Temperature
Range (Fahrenheit)
-25° to +190°
Elongation
400%
Thickness
Range (inches)
0.015 - 0.025

Silicone

Silicone is an organic/synthetic compound that offers protection in temperature extremes. It is also weather and fire resistant and a great insulator. Silicone has low tensile abrasion and chemical resistance.

Elastomer
Silicone
Color
Multiple
Durometer
Range
25-80
Tensile Strength
Range (psi)
600
Temperature
Range (Fahrenheit)
-80° to +450°,
(500° intermittence)
Elongation
250%-500%
Thickness
Range (inches)
0.010 - 1

Viton

Viton is a high grade compound that has excellent resistance to high heat, chemicals, and weather, making this product a great choice for use in highly corrosive environments. Viton offers superior mechanical properties and compression abilities. Applications include fuel systems seals, chemical-resistant gasket seals and rubber o-rings.

Elastomer
Viton
Color
Black
Durometer
Range
70-80
Tensile Strength
Range (psi)
1000-1300
Temperature
Range (Fahrenheit)
-15° to +400°
Elongation
175%
Thickness
Range (inches)
0.0625 - 0.25

PVC Sheet (Vinyl)

PVC sheet, or vinyl, has very good resistance to oils and low permeability to gasses. While its resistance to UVs is good, it has excellent resistance to acids, bases, alcohols, and mineral oils. Although it has low resistance to hot and cold temperatures, PVC sheet has excellent aging characteristics.

Elastomer
PVC Sheet
Color
Black
Durometer
Range
70
Tensile Strength
Range (psi)
1000
Temperature
Range (Fahrenheit)
20° to 160°
Elongation
250%
Thickness
Range (inches)
0.0125 - 0.25

Nitrile Buna - N

Buna - N has excellent resistance to petroleum-based oils. It also has good resistance to heat, abrasions, water, and gasoline. Nitrile Buna - N can be used for automotive applications.

Elastomer
Nitrile Buna - N
Color
Black
Durometer
Range
40-80
Tensile Strength
Range (psi)
800-1000
Temperature
Range (Fahrenheit)
-20° to +170°
Elongation
300%
Thickness
Range (inches)
0.031 - 2

Skirtboard Rubber (SBR)

SBR has good tear and abrasion resistance. It is most commonly used to protect conveyor frames, chutes, and various other high impact areas.

Elastomer
Skirtboard
Color
Black
Durometer
Range
55-65
Tensile Strength
Range (psi)
2500-2800
Temperature
Range (Fahrenheit)
-20° to +200°
Elongation
500%
Thickness
Range (inches)
0.125 - 1

Butyl (SBR)

Butyl can be used as a general use rubber as it has good chemical resistance. Since butyl has a much higher permeability to air than most rubber products, its uses are vast. Among its wide variety of uses are tire tubes.

Elastomer
Butyl
Color
Black
Durometer
Range
55-65
Tensile Strength
Range (psi)
1800
Temperature
Range (Fahrenheit)
-30° to +300°
Elongation
350%
Thickness
Range (inches)
0.0625-0.25

Cloth Inserted (CI) (or Diaphragm)

CI rubber is reinforced with cloth making the material able to withstand stronger compression applications. It also has a good resistance to alkalis and acids. Appropriate uses for the material include hot water, low pressure steam, and hydraulic systems.

Elastomer
Butyl
Color
Black
Durometer
Range
65
Tensile Strength
Range (psi)
900
Temperature
Range (Fahrenheit)
-20° to +170°
Elongation
200%
Thickness
Range (inches)
0.0625-0.25

Hypalon

Hypalon, a synthetic rubber, has a good resistance to heat, oil, and chemicals. It can also have good resistance to weather, abrasions, and fires. Another property of hypalon is its ability to maintain its color during use. Many hypalon uses include hosing, power steering hoses, and fuel hose covers.

Elastomer
Butyl
Color
Various
Durometer
Range
50-60
Tensile Strength
Range (psi)
1100-1500
Temperature
Range (Fahrenheit)
-20° to +220°
Elongation
350%
Thickness
Range (inches)
0.031-0.25