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Types of Rubber Molding
Educate yourself on the different types of rubber molding techniques such as LIM™, Compression and Transfer molding. more...

Frequently Asked Questions
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MATERIALS & APPLICATIONS

Silicone, Fluorosilicone, and Viton™, (Fluorocarbon) are just some of the compounds we use. The Custom Rubber Molding of our compounds (formulations) are custom made for your application. Although we have many "standard" materials, every part has a specific formulation. We have over 600 existing formulas to choose from. Should one of these not meet your needs, we will gladly formulate a new compound for your application without a special "set-up charge."

Liquid Injection Molding for Medical & Food Grade Products.
Silicone Molding for Aerospace, Automotive, Electronics and
Commercial Industry.

SILICONE
(Methyl, Methyl-Vinyl,
Methyl-Phenyl,
Methyl-Phenyl-Vinyl)

Temperature Range:
General
(-75° F / -65° F to 400° F)
(-59° C / -54° C to 204° C)
Special
(Low Temp: Down to -175° F / -115° C)
(High Temp: Up to 500° F / 260° C)
Data:
Durometer: 5-80 Shore A
Specific Gravity: 1.10 - 1.50 (Typical)

Advantages

Excellent Ozone, Sunlight and
   Oxidation Resistance
Outstanding Resistance to High Temperature
Excellent Low Temperature Flexability
Very Good Electrical Insulation
Superior Color Stability
Low Compression Set

Limitations

• Not for Super Heated Steam (Over 250° F)
• Poor Abrasion, Tear, and Cut Growth Resistance
• Inferior Oil, Gasoline and Solvent Resistance
• Poor Resistance to Alkalis and Acids

• Generally Low Tensile Strength

• Not for Aromatic Mineral Oil
(Special Hi-Tear Resistance Compounds Available)

Fluorosilicone Molding used for aircraft fuel systems and other custom rubber molded products.

Fluorosilicone
(Fluoroalkyl Polysiloxane)

Temperature Range:
General
(-100° F to 350° F)
(-73° C to 177° C)
Special
N/A
Data:
Durometer: 40-80 Shore A
Specific Gravity: 1.40 - 1.65 (Typical)

Advantages

• Excellent High & Low Temperature Resistance
Excellent Resistance to Fuels & Solvents
Excellent Ozone & Sunlight Resistance
Excellent Compression Set Resistance
Very Good Thermal Conductivity
Superior Color Stability

Limitations

• Poor Resistance to Ketones & Phosphate Esters
• Fair Mechanical Resistance Properties
• High Thermal Expansion Coefficient

• Permeable to Most Vapors & Gases
• Fair Water & Steam Resistance
• Fair Tensile Strength

Viton Rubber Seals, Gaskets and other custom rubber products used in extreme
applications.

Viton™
(Fluorocarbon, Fluorel, FMK,
Fluorinated Hydrocarbon)

Temperature Range:
General
(-15° F to 400° F)
(-26° C to 204° C)
Special
(Low Temp: Down to -40° F / -40° C)
(High Temp: Up to 500° F (260 C) w/Shorter Life Expectancy)
Data:
Durometer: 50-90 Shore A
Specific Gravity: 1.70 - 2.20 (Typical)

Advantages

• Very Good Resistance to Oxygen,
  Ozone & Sunlight
Outstanding Resistance to High Heat
  (Up to 400 F)
Excellent Resistance to Hydraulic
   Fluids & Grease
Excellent Resistance to Oil, Gasoline, Silicone Oil
Very Good Impermeability to Gases & Vapors
Good Flame Resistance

Limitations

• Very Little Resistance to Oxygenated Solvents
• Very Poor Resistance to Low Temperatures

• Fair to Good Water & Steam Resistance

• Poor Tear, and Cut Growth Resistance

• Fair Adhesion to Fabrics & Metals

• Fair Electrical Properties

Neoprene molding used for
environmental application where petroleum products
are not present and
general sealing.

Neoprene
(Chloroprene (CR) Polycholoprene)

Temperature Range:
General
(-40° F to 250° F)
(-40° C to 121° C)
Special
(Low Temp: Down to -65° F / -54° C)
(High Temp: Up to 300° F / 149° C)
Data:
Durometer: 40-95 Shore A
Specific Gravity: 1.35 - 1.60 (Typical)

Advantages

• Good Resistance to Abrasion & Flex Cracking
Good Resistance to Refrigerants & Ammonia
Very Good Resistance to Ozone & Sunlight
Good Resistance to Alkalis & Acids
Moderate Oil & Gasoline Resistance
Good Inherent Flame Resistance

Limitations

• Very Poor w/Polar Solvants
  (MEK, Acetone, Esters)
• Poor to Fair Resistance to Oxygenated Solvents
• Poor to Fair Resistance to Aromatic Solvents
• Limited Low Temperature

• Fair Electrical Resistivity
• Fair Dynamic Properties

Nitrile molding used for
petroleum product exposure and other molded rubber products.

Nitrile
(Acrylonitrile Butadiene,
NBR, Buna-N)

Temperature Range:
General
(-30° F to 250° F)
(-34° C to 121° C)
Special
(Low Temp: Down to -65° F / -54° C)
(High Temp: Up to 275° F / 135° C)
Data:
Durometer: 40-90 Shore A
Specific Gravity: 1.15 - 1.40 (Typical)

Advantages

• Superior Resistance to Petroleum-Based    Hydraulic Fluids
Good Resistance to Hydrocarbon Solvents
Excellent Cold Water Resistant Properties
Good Resistance to Dilute Alkalis & Acids
Wide Range of Service Temperatures
Very Good Oil & Gasoline Resistance
Good Abrasion Properties

Limitations

• Not Recommended for
   Chloronated Hydrocarbons

• Not Recommended for Glycol Based Brake Fluids
• Not Recommended for Phospate Ester Fluids

• Poor Resistance to Oxygenated Solvents

• Inferior Resistance to Ozone & Sunlight

• Not Recommended for Strong Acids

• Poor Flame Resistance

Ethylene Propylene molding
used for water and
environmental seals where
petroleum products are absent.

Ethylene Propylene Rubber
(EPDM, EPR, EP, EPT)

Temperature Range:
General
(-70° F to 300° F)
(-57° C to 149° C)
Special
(Up To 350° F (177 C) For Steam Service)
Data:
Durometer: 45-90 Shore A
Specific Gravity: 1.10 - 1.30 (Typical)

Advantages

• Good Resistance to Phosphate Ester Based    Hydraulic Fluids
Good Resistance to Alkalis, Acids &
   Oxygenated Solvents
Excellent Resistance to Heat, Ozone & Sunlight
Good Resistance to Glycol Based Brake Fluids
Very Good Low Temperature Flexibility
Superior Resistance to Water & Steam

Limitations

• Not Compatible w/Di-Ester Based Lubricants
• Low Hydrocarbon Solvent Resistance
• Poor Mineral Oil Resistance
• Poor Flame Resistance
• Poor Gas Resistance
• Poor Oil Resistance

Disclaimer

It is important that you analyze ALL aspects of your application and review the information provided concerning the product or system within the current website.

Due to the variety of customer applications and operating conditions, the user, through his or her own analysis and testing, is soley responsible for making the final selection of the product and systems required and assuring that all performance, safety, warning and regulatory requirements of the application are met.

KDL Precision Molding may assist you in the education of the materials and their application but is not held liable for the selection of such materials for your application.