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TEL: 1-630-595-4770 FAX: 1-847-273-0566

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TEL: 1-630-595-4770 FAX: 1-847-273-0566

Participate in the Global Marketplace with CRS Inc. As a quality supplier of Rubber Products and Seals, it is our job to educate your Engineering staff on all of the sealing solutions and materials available for your specific appl ication . Take advantage of our expertise in elastomeric materials, our experience in seal design and ultimately benefit from the quality products that we will supply you through our domestic & global supply chain .

"Value through Design, Service & Strategic Sourcing."

~--------------~ Design

We have the capabilities to tackle the most complicated design and application issues. Our years of experience in design and manufacturing solutions coupled with our access to talent in the industry, have brought immeasurable added value to our customers . Let us prove this to you, challenge us with your issues and let us see if we can help. We are proud to say our roots in th is business came from tackl ing the problem parts of our customers one at a t ime. One of our design goals is to reduce the number of components while creating a product improvement at a cost reduction. '

Service Our commitment to service is more tha n a promise, it is why ou r customers continue to give us more business. At CRS, everyone is accessible, giving our customers the right answers, when they need them. O ur sales people spend their t ime educating our customers and working d irectly with Engineering on design issues and material requirements . Perhaps the most valued portion of service is face-to-face contact. At CRS we look forward to seeing our customers . We ask all of our clients to take us to task on the long-lost art of service, we want to know your product intimately.

Strategic Sourcing

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Because Chicago Rubber & Seal , Inc. is the consolidated source for rubber products and seals at many large OEM's, our purchasing power is increased ten-fold over our customers. Our industry sourcing expertise in conjunction with our efficient logistics system have provided us with and incredible advantage for us and our customers . Vendor consolidation is vital to your company's efficiency, take advantage of our extensive but focused product line.

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Quality Our quality system covers the entire supply process; from the design and quoting process, to production, and ultimate delivery to the customer. Our goal is to address all potential issues up front, and in detail .

• PPAP's are available from our ISO. OS and TS16949 registered factories and documents will be supplied upon request or with all 1st article orders.

• All of our products are quoted to manufacturing tolerances standards that will insure consistency from part to part. (See RMA tolerance tables on page 12.)

• Rubber Products materials are produced to meet specified industry standard, ASTM call-outs.

• Inspection Equipment: O ur facilities use the latest equipment to make sure that you receive parts to print, the first time. Our FTIR molecular spectroscopy system by PerkinEimer® allows us to verify compounds down to the molecular level.

Product Line Custom Molded Rubber is our largest product line. Our value is demonstrated while working with your engineering staff to determine the most cost-effective design and material for your unique appl ication .

• Comprehensive Materials Expertise

• Experienced Design Assistance to focus on component reduction, product improvement and cost reduction

• Materials produced to ASTM standards

• All Processes: Compression, Transfer, Injection (see Molding Methods on page 11)

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Product Line Shaft Seals are our second largest product line and we offer over 2500 tooled sizes and styles as well as very competitive tooling costs .

• Standard styles (See Shaft Seal Styles Addendum)

• High Pressure Designs

• Bearing Seals

• Heavy Duty Exclusion Seals

• Rubber Bonded to metal components

• PTFE lip shaft seals

Formed Rubber Hoses I Tubes produced and supplied to your requirements .

• We supply both reinforced and non-reinforced to all SAE, JIS and JASO Standards.

• Homogeneous as well as multiple layered material as dictated by the application .

• Let our sales engineers work with you to design the most cost-effective solution .

• XYl coordinate point fixtures for inspection . ·

Isolators and Vibration Dampening Components and Custom Molded Grommets • Let our expert salespeople educate you on dampening

materials for your application.

• Used to control shock and vibration in a variety of industries and applications.

• Our experience in rubber bonded to metal components is second-to-none in the industry.

• Precision Molded grommets to your custom specifications and material requirements.

Standard 0-Rings and Custom Molded 0-Ring Shapes • Tooled and all AS568 Sizes in a variety of materials to support your

ranging applications.

• Inexpensive tooling costs on custom shapes and cross-sections.

• CRS specializes in Fluoroelastomer and Fluorosilicone materials for extreme temperature ranges and resistance to fuels.

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ISOLATORS

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Product Line Gaskets The gasket in a joint is often viewed as the smallest, least expensive, and " simplest" part of the joint. O ften a gasket is chosen almost as an afterthought, long after the joint is designed. This should not be the case, let our sales expert work with you to specify the opti mum material for the applicat ion.

• Stamped or Steel Rule Die

• Wide Range of Materials

• Tooling designed to minimize material waste

Molded Bellows & Boots • For use in u-joints, exhaust systems, etc.

• As required by your design, we can supply this complete with a wire spring insert for added rigidity.

• Available in all elastomers.

Polyurethane Polyurethane is used in applications requiring abrasion or extrusion resistance . Polyurethane is extremely durable, however it is typically more expensive than standard elastomers.

Polyurethane 0-Rings Polyurethane 0-Rings should be used in application requiring extrusion resistance or long term abrasion resistance.

• Polyurethane 0-Rings can replace an o-ring and back-up ring in high pressure va lve applications.

• Polyurethane 0-Rings can triple service life in piston applications vs. a nitrile o-ring.

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Rubber Materials Application Guide


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Material Properties Starting Point:

1. Define the application and environment:

• Define t he Temperature

• Define t he Pressu re (if applicable)

• Define the Flu id or med ia to be sealed (if appl icab le)

• Define t he Environment (Sunlight, O zone, Heat, Cold, etc.)

• Define the Properties required of the material (Durometer, Compression set, Abrasion resistance, Static vs. Dynamic)

2. Refer to ASTM Standards for (American Society for Testing Materials) for industry standard callouts for material properties. Your salesperson can work with you to educate you on this industry standard and to assist in defining your applications requirements.

NOTE: This informat ion is to be used as a guide, please work with your salesperson to define your applicat ions requirements and let our engineers assist in the materia ls designation and part design.

Nitrile (Buna-N): Nitrile rubber is the general term for acrylonitrile butadiene terpolymer. The acrylonitrile content of nitrile sealing compounds varies considerab ly (18 to 50%) and influences the physical properties of the finished material . The higher the acry lonitri le content, t he better the resistance to oil and fuel. At the same time, elasticity and resistance to compression set is adversely affected . In view of the opposing realities, a compromise is often drawn and a medium acry lonitrile content selected . Nitrile has good mechanical properties when compared with other elastomers and high wear resistance . Nitrile is not resistant to weathering and ozone.

Temperature range: -30° to 250° F (-34° to 121 ° C). Chemical resistance: aliphatic hydrocarbons (propane, butane, petroleum oil, mineral oil and grease, diesel fuel, fuel oils). vegetable and mineral oils and greases; HFA, HFB and HFC fluids; dilute acids, alkali and salt solutions at low temperatures; water (special compounds up to 212°F (1 00°C)) . Not compatible with : fuels of high aromatic

• • • • • • I I I I I I

I • I I • • content (for flex fuels a special compound must be used); aromatic hydrocarbons (benzene); chlorinated hydrocarbons (trichloroethylene); polar solvents (ketone, acetone, acetic acid, ethylene-ester); strong acids; brake fluid with glycol base; ozone, weather and atmospheric aging.

Ethylene Propylene (EPDM): Ethylene propylene is a copolymer of ethylene and propylene. Ethylenepropylene-diene rubber is produced using a third monomer and is particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol base. Good water and steam resistance, poor oil resistance .

Temperature range: -70° to 250° F (-57° to 121 o C). Chemical resistance: hot water and steam up to 300°F (149°C) with special compounds up to 400°F (204°C); glycol-based brake fluids up to 300°F (149°C); many organic and inorganic acids; cleaning agents, soda and potassium alkalis; phosphate-ester based hydraulic fluids (HFD-R); silicone oil and grease; many polar solvents (alcohols, ketones, esters); Skydrol 500 and 7000; ozone, aging and weather resistant. Not compatible with : mineral oil products (oil~, greases and fuel s).

www.sourcerubber.com • (630) 595-4770

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Material Properties

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Fluorocarbon, a.k.a. Viton®: Viton® has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthet ic hydraulic fluids, fue ls, aromatics and many o rganic solvents and chemicals. Gas permeability is very low and similar to that of buty l rubber. Specialty Viton® grade compounds have been developed for improved resistance to acids, fuels, water and steam and low temperatures. Contact your Territory Manager for additional options.

Temperature range: -15° to 400°F (-26° to 205°C). Chemical resistance: mineral oil and grease, low swelling in ASTM oil no. 1 and IRM 902 and IRM 903 oils; non-flammable hydraulic fuels in the group HFD; silicone oil and grease; mineral and vegetable oil and grease; aliphatic hydrocarbons (fuel, butane, propane, natural gas); aromatic hydrocarbons (benzene, toluene); chlorinated hydrocarbons (trichlorethylene and carbon tetrachloride); fuels, also fuels with methanol content; high vacuum; very good ozone, weather and aging resistance . Not compatible with : glycol-based brake fluids; ammonia gas, amines, alkalis; superheated steam; low-molecular-weight organic acids (formic and acetic acids). Viton® is a registered trademark of Dupont Dow Elastomers.

Neoprene (Chloroprene): Neoprene was the first synthetic rubber developed commercially and exhibits generally good ozone, aging and chemical resistance. It has good mechanical properties over a wide temperature range.

Temperature range : -35° to 225°F (-3JC to 1 07°C). Chem ical resistance: paraffin-based mineral oil with low DPI e.g. ASTM oil no. 1; silicone oil and grease; water and water solvents at low temperatures; refrigerants; ammonia; carbon dioxide; improved ozone, weathering and aging resistance compared with nitrile. Limited compatibility: naphthalene-based mineral oil (IRM 902 and IRM 903 oils); low-molecular-weight aliphatic hydrocarbons (propane, butane, fuel); glycolbased brake fluids. Not compatible with : aromatic hydrocarbons (benzene); chlorinated hydrocarbons (trichlorethylene); polar solvents (ketones, esters, ethers, acetones).

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HNBR: (Highly Saturated Nitrile Butadiene Rubber) : Hydrogenation of nitrile simply reduces the amount of carbon to carbon double bonds which are the attack sites or weak links in • • • • • • the polymer chain. HNBR offers a tougher, higher temperature material with I I I I I I increased chemical resistance. It is used widely in air conditioning systems. - 1- 1- 1- 1 1 1 ••••• =• Temperature range: -40° to 325°F

Fluorosilicone: Fluorosilicone contains trifluoropropyl groups next to the methyl groups. The mechanical and physical properties are very similar to silicone. However, fluorosilicone offers improved fuel and mineral-oil resistance but poor hot-air resistance when compared with silicone.

Temperature range: -100° to 350°F (-73° to 177°C). Chemical resistance: aromatic mineral oils (IRM 903 oil); fuels; low-molecular-weight aromatic hydrocarbons (benzene, toluene).

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Material Properties

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Silicone: The term "silicone" covers a large group of materials in which vinyl-methyl-silicone is often the central ingredient. Silicone elastomers as a group have relative ly low tensile strength and poor tear and wear resistance. Silicones have good heat resistance, good co ld f lexibility and good ozone and weather resistance as well as good insulating and physiologicall y neutral properties.

Temperature range: -65° to 450°F (-54° to 232°C). Chemical resistance : • • • engine and transmission oil (e .g. ASTM oil no. 1); animal and vegetable oil • - - • • - - • • - - •

·~ I I I ·~ and grease; brake fluid (non-petroleum base); fire-resistant hydraulic fluid, • - - • - ® _ • _ ®- e - -• HFD-R and HFD-S; high-molecular-weight chlorinated aromatic hydrocarbons ~ 1 1 1 e (including flame-resistant insulators, and coolant for transformers); • - 1 - • • -~ - · • - 1 - •

• • • moderate water resistance; diluted salt solutions; ozone, aging and weather resistant. Not compatible with : superheated water steam over 250°F (121 °C}; acids and alkalis; low-molecularweight chlorinated hydrocarbons (trichlorethylene); aromatic minera l oil; hydrocarbon-based fuels; aromatic hydrocarbons (benzene, toluene).

Polyurethane: One must differentiate between polyester urethane (cast) and polyether urethane (millable). Millable urethanes exhibit better resistance to hydraulic fluids. Polyurethane elastomers, as a class, have excel lent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers. Permeability is good and comparable with butyl.

Temperature range: -40° to 180°F (-40° to 82°C) . Chemical resistance: pure aliphatic hydrocarbons (propane, butane, fuel); mineral oil and grease; silicone oil and grease; water up to 125°F (50°C) (cast); ozone and aging resistant. Not compatible with : ketones, esters, ethers, alcohol, glycols; hot water, steam, alkalis, amines, acid .

Butyl: Butyl is produced by many companies in different types and varies wide ly in isoprene content. Isoprene is necessary for proper vulcanization . Butyl has a very low permeability rate and good electrical properties.

Temperature range : -75° to 250°F (-59° to 121 °C}. Chemical resistance: hot water and steam up to 250°F (121 oq ; brake fluids with glycol base; many acids; salt solutions; polar solvents, e.g. alcohols, ketones and esters; poly-glycol-based hydraul ic fluids (HFC fluids) and phosphate-ester bases (HFD-R fluids) ; silicone oil and grease; ozone, aging and weather resistant. Not compatible with : mineral oil and grease; fuels; chlorinated hydrocarbons.

Aflas: Aflas is a copolymer of tetrafluoroethylene and propylene . Its chemical resistance T is excellent across a wide range of aggressive media. T T T ·- ~-·

Temperature range: -25° to 450°F (-4° to 232°C) . Compatible with: bases; phosphate esters; - ©- -amines; engine oils; steam; pulp and paper liquors. Not compatible with: aromatic fuels; I I I I ketones; carbon tetrachloride. • • • •

Thermoset: Thermosetting materials are typically vulcanized to achieve their final properties. Vulcanization is a process that utilizes heat, pressure and time to form chemical bonds that are not thermally reversible, meaning a material is irreversibly degraded by exposing it to prolonged temperatures above its service temperature range . Thermoset processing for rubber is usually done through procedures such as compression molding, transfer molding, rubber injection molding, or rubber extrusion.

Thermoplastic: Thermoplastic materials are fully reacted chemicalry before being introduced into the manufacturing process. The bonds that are formed in the material are thermally reversible, meaning that they will break down with the addition of heat, and reform when that additionai heat is removed . This allows thermoplastic material to be man ufactured by plastics techniques such as injection.


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Technical References Basic jves

Decision Matrix ves l

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Compression Molding

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The Compression Molding process is similar to making a waffle . A surplus of material must be placed in the cavity to ensure total cavity fill. Heat and pressure are applied, causing the compound to flow, filling the cavity and spilling out into overflow grooves. Compression molding is often chosen for medium durometer compounds- in high volume production, or applications requiring particularly expensive materials. The overflow, or flash, created by larger diameter parts is of particular concern when using the more expensive compounds. Compression molding helps to minimize the amount of overflow. The preload, however, can be difficult to insert in a compression mold of more complex design, and the compression molding process does not lend itself to the material flow requirements of high durometer compounds.

Flash on a typical compression molded part is a maximum of .004 x.01 0 to .005 x.03, depending on the de-flashing methods. (Cryogenic.)

Overflow or "Flash" to be removed in secondary operation

Transfer molding differs from compression molding in that the material is placed in a pot, located between the top plate and plunger. The material is squeezed from the pot into the cavity through one or more orifices called gates, or sprues. The flash on a transfer custom-molded part, oro-ring, is typically a maximum of .005 thick, extending approximately .003 from the part surface.

Injection molding is the most highly automated of the molding processes. The material is heated to an easily flowing state and injected under pressure from the heating chamber through a series of runners or sprues into the mold .

Injection molding is ideal for the high-volume production of molded rubber parts of relatively simple configuration .

NOTE: There are some restrictions as to the -choice of materials available for injection molding.


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RMA Dimensional Tolerances for custom molded rubber products

A 1 - High Prtclslon

A2 - Precision Sll.E ( n.t

0 . 0 -.63

.6 1.00 1.00 l.bO 160 -2."0

0 .00 .00 . 0

A3 - Commerdal

A4 • B sic

OOR

12

11 A 1 11 High Precision A 1 is the tightest tolerance classification and indicates a high precision rubber product. Such products require expensive molds, fewer cavities per mold, costly in-process controls and inspection procedures. The exact method of measurement should be agreed upon in advance between the manufacturer and the customer, as errors in measurement may be large in relation to the tolerance. Some materials, particularly those requiring post curing, (i .e., fluoroelastomers); do not lend themselves to A 1 tolerances.

11 A2 11 Precision The A2 tolerance indicates a precision product. Molds must be precision machined and kept in good repair. While measurement methods may be simpler than the drawing dimension A 1, careful inspection will usually be required . (A2 are typically assumed to be the standard rubber tolerances for engineered rubber components unless otherwise indicated.)

11 A3 11 Commercial The A3 tolerances indicate a commercial product and will normally be used for non-critical applications for which precision molding is not required.

11 A4 11 Basic When cost, not dimensional control, is of overriding importance, this tolerance is used.

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