Ragco’s sealing expertise extends beyond flat gaskets. We can replicate or customize extruded profiles to be manufactured in the material best suited for your application. Uncured rubber is forced through a die of the desired shape under pressure from an extruder. The extruded product is then cured in a heated pressure vessel known as an autoclave. Extruded parts can be made in sizes ranging from 1/8” in diameter to a rectangular cross-section of up to 6” by 12” and in continuous lengths of up to 60 feet. The manufacture of extrusions into circular or rectangular gaskets can be accomplished by means of butt style or corner-vulcanized splices.
Molded rubber products include those made by both compression and transfer molding. These can all be made into homogenous, fabric-reinforced, or rubber-to-metal products. Unique capabilities include our ability to manufacture unusually large, fully molded parts, in molding presses as large as 84” x 108”. Custom Molded Sheet (for gasket cutting) in most elastomers (including fluoroelastomer), to most military and industrial specifications, are also available. Just give us a drawing or sketch, or even an old part, and we’ll take it from there! You may be surprised at how reasonable the cost can be to replace an aftermarket part that you may be currently purchasing from an O.E.M.
Lock & key
Door & hatch gasket
Common extrusion & molded materials
NATURAL RUBBER (NR) (GUM) Has excellent mechanical properties. It has excellent tensile, elongation, tear resistance and resilience. It has good abrasion resistance and excellent low temperature flexibility. Without special additives, it has poor resistance to ozone, oxygen, sunlight and heat. It has poor resistance to solvents and petroleum products. Useful Temperature range is -67°F to 180°F (-55°C to 82°C).
NITRILE/BUNA N (NBR) (HYCAR) (CHEMIGUM) Has excellent physical properties, however its claim to fame is based on its resistance to water, petroleum products and fuels. When compounded properly, it has good low temperature properties as well as good heat resistance. It does not have good ozone, oxygen, or sunlight resistance without the addition of special additives. Useful temperature range is -40°F to 275°F (-40°C to 135°C).
CARBOXYLATED NITRILE (CBNR) Has the excellent water, oil and fuel resistance of conventional NBR. It has superior abrasion resistance and load bearing capabilities. It retains good physical properties over a useful temperature range of -40°F to 300°F (-40°C to 150°C).
NEOPRENE/CHLOROPRENE (CR) Has excellent physical properties. It is moderately resistant to petroleum products, sunlight, ozone, and heat. It is flame resistant and will not support combustion. Useful temperature range is -40°F to 275°F (-40°C to 135°C).
ETHYLENE-PROPYLENE (EPDM) (EPR) Has outstanding resistance to oxygen, ozone, and sunlight. It’s resistant to popular materials such as Phosphate Esters, many ketones and alcohol. It has good electrical properties, low temperature flexibility, and excellent heat, water and steam resistance. Its resistance to petroleum products is poor. Useful temperature ranges 58°F to 300°F (-50°C to +150°C).
HYPALON (CSM) Has outstanding oxygen, ozone and weather resistance. It has excellent resistance to corrosive chemicals as well as oil and grease. It has excellent abrasion resistance and excellent tensile and elongation. Useful temperature range is -67°F to 320°F (-50°C to +160°C).
STYRENE BUTADIENE (SBR) (BUNA-S) (GRS) Has similar properties to natural rubber. It’s resistance to solvents and petroleum products are about the same as natural rubber. Water resistance is better. Without special additives, it is vulnerable to ozone, oxygen and sunlight. Useful temperature range -67°F to 180°F (-55°C to 82°C)
SILICONE Has outstanding resistance to temperature extremes. It has excellent vibration damping, and reasonable physical properties such as tensile and elongation. Tear and abrasion resistance are generally poor. Useful temperature range -148°F to 600°F (-100°C to 315°C).
FLUOROELASTOMER (VITON) (FLUOREL) Has good resistance to most chemicals and commercial fluids. It has an outstanding ability to retain strength at elevated temperatures and to withstand embrittlement during long-term heat aging. It has outstanding compression set with ability to recover following deflection at up to 450°F (230°C). The temperature range is -22°F to +450°F (-30°C to +230°C), but will withstand temperatures up to 600°F (315°C) for short periods of time.
NOTE: Since there is such a complex relationship between material selection and product performance, the information given here is very broad and should be used only as a general guide. Please contact Ragco with information specific to you application for an elastomer recommendation.
Please note: Ragco affiliates have full autonomy to provide services that best suit their respective markets. Please check with your local Ragco location to learn what capabilities they offer. Find the closest affiliate to you here.