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Jefferson Rubber Works was incorporated in June, 1975, to provide a source of high precision, cost efficient rubber molded parts for large volume rubber consumers. Using the injection molding process, our state-of-the-art technology enables us to produce at rates far greater than conventional molding equipment. We produce our rubber parts in a modern facility at the Worcester Airport Industrial Park. Our relationships with affiliates around the world allow us to offer the most competitive prices available. Our staff brings a broad spectrum of knowledge and keen insight to the operation, with years of experience in the rubber molding industry. With this direction, Jefferson Rubber Works has grown in productivity, market share and expertise. We have prototyping capabilities that permit us to provide customers with product samples demonstrating our technology. Let our knowledgeable team provide a free design review. We have set ourselves apart from other rubber molders by using applicable plastic technology to replace aging compression and transfer molding methods.
About Jefferson Rubber
Custom Applications
Custom Injection Molding Company Jefferson Rubber Works, Inc. (JRW) offers a one stop resource for all of your custom injection molding needs. Since 1975 JRW has manufactured custom molded rubber parts with unparalleled accuracy. Some other rubber parts manufacturers use aging compression and transfer rubber molding methods. JRW’s state-of-the-art custom injection molding processes, the latest equipment, and a highly trained staff with years of rubber molding experience ensure that your parts meet your exacting requirements. Contact Jefferson Rubber Works and let us take your part from prototype to finished product. Jefferson Rubber Works molds parts for customers in a wide variety of markets. We provide the following parts and more for OEMs and large volume customers: [list type=”arrow”] Automotive – Window closeouts Medical – Laproscopic Seals, Liquid Injection Molding Construction – Sprinkler pipe gaskets & stand pipe seals Hydronics – Water Tank & Expansion Tank Diaphragms [/list] The U.S. government even depends on JRW to produce gas mask second skins and nosecup disk valves. Whether you require laproscopic seals, window closeouts, bellows, couplings, or gaskets, you don’t need to work with multiple injection molding companies. You can depend on Jefferson Rubber Works to produce all of the custom rubber parts…
Capabilities
If you’re looking for an experienced molded rubber parts manufacturer, contact Jefferson Rubber Works, Inc. (JRW) JRW can provide you with rubber molding expertise and state-of-the-art rubber injection molding technology that ensures top quality molded rubber parts. By using applicable plastic technology, JRW can produce parts at a greater rate than other injection molding companies. Whether you need rubber caps, seals, mounts, bellows, or other molded rubber parts, Jefferson Rubber Works can take your part from prototype to finished product. When you work with Jefferson Rubber Works, you can count on quality rubber parts production from the design and manufacture of your free design review to final finishing and assembly. Molding rubber is our specialty, and we have the capability to provide parts design, prototyping, production, finishing, and assembly, so you don’t have to work with multiple companies–JRW is your one stop resource for all your rubber molding needs. As an ISO/QS 9000 certified company, Jefferson Rubber Works demonstrates its dedication to quality. Customer satisfaction is our primary goal, and we work continuously to lower our costs and increase our efficiency. Contact Jefferson Rubber Works, your source for “high precision”, “cost efficient” rubber molded parts.
Rubber Molding Capabilities
Rubber Injection Molding
Transfer Molding
Liquid Silicone Injection Molding
Compression Molding
Rubber to Metal Bonding
Prototyping
Thermoplastic Elastomers
With in-depth experience Jefferson Rubber Works, can take your TPE project from concept to reality with the highest level of quality at the most competitive price, on time, every time. About Thermoplastic Elastomers Thermoplastic elastomers (”’TPE”’), sometimes referred to as ”’thermoplastic rubbers”’, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) which consist of materials with both thermoplastic and elastomeric properties. While most elastomers are thermosets, thermoplastics are in contrast relatively easy to use in manufacturing, for example, by injection molding, which Jefferson Rubber Works does. Thermoplastic elastomers show both advantages typical of rubbery materials and plastic materials. The principal difference between thermoset elastomers and thermoplastic elastomers is the type of cross linking bond in their structures. In fact, cross linking is a critical structural factor which contributes to impart high elastic properties. The crosslink in thermoset polymers is a covalent bond created during the vulcanization process. On the other hand the crosslink in thermoplastic elastomer polymers is a weaker Intermolecular force orhydrogen bond or takes place in one of the phases of the material. Types There are six generic classes of TPEs generally considered to exist commercially that we work with.…
Liquid Silicone Rubber
Liquid silicone rubber injection molding is the most recent addition to Jefferson Rubber Works, Inc.’s molding operations. The faster cycle times and improved performance properties of liquid silicone rubber make it a good choice for a variety of molded components. Liquid silicone rubber (LSR) remains flexible and elastic beyond -70°F and retains its properties up to 450°F which makes liquid silicone rubber a good candidate for gaskets, seals, boots, bellows, medical devices and other applications where outdoor conditions are demanding. Cured liquid silicone rubber does not out-gas volatiles and plasticizers as other rubber compounds do – which has made it friendly to various assemblies that were formerly required to be ‘silicone free’. A key advantage of liquid silicone rubber over gum based molding silicone compounds is the cycle time. Depending on the catalyst and cross-section of the molded component, the cycle times for liquid silicone molded parts range from 30 seconds to three minutes – with our average cure time of 25 to 50 seconds. In contrast, gum base silicones may take from 3 to 5 minutes total cycle time in a traditional silicone mold. Therefore, a single or two cavity injection mold will out-produce a multi-cavity mold. With fewer…
Products
Rubber Grommets
Rubber Bellows
Jefferson Rubber produces rubber bellows and boots in many different configurations, sizes and materials to meet your most demanding needs. Our Bellows and Boots are utilized in applications requiring protection against dust, moisture, oils, chemicals, and UV, just to name a few.Molded Rubber Bellows Molded bellows and boots are versatile seals used in a wide range of applications to seal dust and other environmental elements in applications with a stroke or designed range of motion.. Each of these methods has certain attributes that would be relevant based on the criteria of the application. Bellows and boots produced in this manner can be made from a variety of materials, colors, and durometers. In addition, this process allows for a part with varying wall thicknesses, and other configurations not found in the other styles. Latex Dip Molded Bellows and Boots Latex dip molded bellows and boots are produced by dipping a metal former into liquid rubber latex material. This method is normally utilized for small to medium production runs. A bellows or boot produced in this manner will have a uniform wall thickness throughout, and are only available in natural or Neoprene1 rubber. Standard wall thicknesses are: Single Dip (.020” / .040” thick)…
Molded Rubber Parts
If you’re looking for an experienced molded rubber parts manufacturer, contact Jefferson Rubber Works, Inc. (JRW) JRW can provide you with rubber molding expertise and state-of-the-art rubber injection molding technology that ensures top quality molded rubber parts. By using applicable plastic technology, JRW can produce parts at a greater rate than other injection molding companies. Whether you need rubber caps, seals, mounts, bellows, or other molded rubber parts, Jefferson Rubber Works can take your part from prototype to finished product. When you work with Jefferson Rubber Works, you can count on quality rubber parts production from the design and manufacture of your free design review to final finishing and assembly. Molding rubber is our specialty, and we have the capability to provide parts design, prototyping, production, finishing, and assembly, so you don’t have to work with multiple companies–JRW is your one stop resource for all your rubber molding needs. As an ISO/QS 9000 certified company, Jefferson Rubber Works demonstrates its dedication to quality. Customer satisfaction is our primary goal, and we work continuously to lower our costs and increase our efficiency. Contact Jefferson Rubber Works, your source for “high precision”, “cost efficient” rubber molded parts.
Rubber Diaphragms
Rubber Expansion Joints
EMI Shielding
Hoses and Ducting
Vibration Isolators
O-Rings and Gaskets
Plugs/Caps/Stoppers
Custom Molded Rubber Bumpers & Feet
Electrical Insulator Gaskets and Shields
Markets
Jefferson Rubber Works, Inc. (JRW) offers custom rubber injection molding of precision parts for diverse markets, including the automotive, medical, government, appliance, construction, OEM industrial, and hydronics industries. Custom rubber injection molding from JRW includes custom injection molding of parts from a variety of elastomers including Silicone, EPDM, butyl, and many more. JRW custom manufactures engineered rubber products with unparalleled accuracy. Our custom injection molding process and state-of-the-art technology enable us to produce custom molded rubber products at rates far greater than conventional rubber molding equipment. JRW also provides custom secondary, finishing and assembly operations so you don’t have to deal with multiple vendors for your finished molded rubber products. Contact Jefferson Rubber Works and let us provide you with affordably priced custom molded parts.
Automotive
US Gov/DOD
JRW’s (Jefferson Rubber Works, Inc.) custom injection molding process and state-of-the-art technology enable us to produce custom molded rubber products with greater speed and efficiency than conventional rubber molding equipment. Utilizing superior engineering, JRW has the ability to work with government agencies and health & safety companies to design and craft customized solutions to meet the most difficult specifications with unparalleled accuracy. JRW, an industry innovator, has been providing advanced rubber solutions to the government and health & safety markets for more than 30 years. Cutting edge technological innovations, such as our second skins for gas masks that aid in protecting against various chemical and biological agents, have been and continue to be the trademark of Jefferson Rubber. Other products produced for this market include respirator masks, smoke masks for firefighters, exhalation valves, goggles, and nose cup disk valves among others. JRW has an arsenal of materials developed for these applications. Some materials include silicone, epdm, neoprene, chlorobutyl, and natural rubber compounds.
Health and Safety
Jefferson Rubber Works Develops Packaging System to Ensure Functionality of Respirator Components One of the most prevalent, growing concerns among jobsite managers today is work-related illness and injury. While a healthy and safe work environment promotes efficiency and productivity, occupational injury or sickness invariably sacrifices man-hours and worker output. The National Institute for Occupational Safety & Health (NIOSH), comprised of renowned scientists from a variety of fields related to occupational wellness, conducts studies and offers recommendations for the prevention of work-related illness and injury. Associated with OSHA, NIOSH is a federal agency, and in collaboration with the Center for Disease Control and Prevention, has offered staggering statistics on the debilitating nature of work-related respiratory illness. It stresses the importance of using safe and functional respirator masks to reduce the number of work-related respiratory illnesses that occur each year. According to NIOSH, occupational respiratory conditions due to toxic agents reached a low point in 1983, with 7,900 cases reported. From 1990-2000, the average number of such cases reported more than doubled at an astounding rate of 21,220 per year, with trends continuing into the current decade. In the latter half of the ‘90’s, over 13,000 work days were missed due to…
Medical
Make the right choice for quality, flashless, contaminant-free, precision-molded rubber medical products. Jefferson Rubber Works, Inc. also offer .Equipped with a controlled environment molding room, Jefferson Rubber Works, Inc. (JRW) Medical Products Group provides flashless, contaminant-free esastomeric parts for high volume healthcare applications.. Our state-of-the-art injection molding equipment produces at far greater rates than compression molding with a much greater degree of uniformity. A wide range of secondary finishing and assembly operations can also be accomplished in our modern facility. Engineering, designing, developmental prototyping, and consultation on material are key factors in the development medical device and instrumentation rubber products. JRW has extensive experience in all facets of medical parts molding and stands ready to assists its customers in any or all phases of the process. Medical applications we worked on include laparoscopic seals, liquid injection molding, catheter seals, valves, pumps, connectors, diaphragms, plunger tips, stoppers, disposables, diagnostic products, and lab equipment. We have several USP Class VI, FDA, and tripartite approved materials to offer for the most demanding applications. Superior quality, responsive service and a team dedicated to providing the service it takes to give you the competitive edge make us the right choice. We bring over three decades…
OEM Products
JRW’s (Jefferson Rubber Works, Inc.) custom injection molding process and state-of-the-art technology enable us to produce custom molded rubber products with greater speed and efficiency than conventional rubber molding equipment. Utilizing superior engineering, JRW has the ability to work with a variety of OEM companies to design and craft customized solutions to meet the most difficult specifications with unparalleled accuracy. JRW, an industry innovator, has been providing advanced rubber solutions to original equipment manufacturers for more than 30 years. JRW produces products for the automotive, electronic, government, medical, construction, appliance, aerospace, telecommunications, health & safety, water, and heavy equipment industries. Regardless of the application, JRW assists its customers through the whole manufacturing process from material selection, design, functionality, and production. JRW has an arsenal of materials developed for various applications. Some materials include silicone, epdm, neoprene, chlorobutyl, and natural rubber compounds. We are the OEM sourcing solution.
Hydronics
When the Rubber Meets the Water – Selecting the Best Rubber Parts for Your Water/Hydronics Applications Depending on what part of the water and hydronics industry you are in, be it the production of potable drinking water systems or the treatment of wastewater, there are a number of different essential variables to consider when selecting rubber components for your equipment. These rubber components can include everything from manhole connector boots and pipe seals, to diffuser membranes and well and expansion tank diaphragms. In the potable water industry, a principle driving factor that impacts rubber part selection is the need to keep the water safe and clean. And in the wastewater treatment arena, key considerations include: will the rubber stand up over time to a range of caustic materials and harsh conditions? This article will discuss the most important variables in each end of the water/hydronics industry spectrum, setting some basic guidelines that will help you select the right rubber parts for your application. Thirsting for the right solution? Potable water is not what it used to be, and that is a good thing. There are stringent standards in place today designed to ensure drinking water is purer, cleaner and safer…
Engineering
Jefferson Rubber Works, Inc. uses state-of-the-art injection molding technology to manufacture custom injection molded rubber parts. Whether you need window closeouts for automotive industry applications, water tank and expansion tank diaphragms used in the hydronics industry, or laproscopic seals for use in medical applications, Jefferson Rubber Works can produce your custom molded rubber parts. There’s no need to work with multiple rubber parts manufacturers. Jefferson Rubber Works is your one stop resource for all your rubber injection moulding needs. Jefferson Rubber Works sets itself apart from other rubber injection molding companies because we offer: Over 30 years of rubber molding experience Parts manufacturing using custom molding processes The latest molding equipment Applicable plastic technology to replace aging compression and transfer molding methods Free design review to demonstrate our technological expertise Jefferson Rubber Works’ injection molding machines range from 20 to 750 tons, and we utilize a computer station with SPC software and online measuring capability. Our dedication to quality allows us to provide you with higher quality parts since we continually seek ways to increase efficiency and reduce costs. For the highest quality on large production runs, you can count on Jefferson Rubber Works for all your rubber molding…
Custom Rubber Molding
Quality
Design Engineers Guide
NR – NATURAL NBR – NITRILE EPDM – ETHYLENE PROPYLENE Good low temperature properties and long flex life. High resilience, elongation and tensile strength, and wide hardness range. Poor resistance to ozone, heat, oil and general weathering. Resistant to attack from mineral oils, petroleum solvents, fair resistance to heat and aging. Relatively poor cold resistance. Cannot be used where weather resistance is required. Excellent resistance to weather and ozone. High tensile strength. Good low temperature properties. Resistant to non-flammable hydraulic fluids (Skydrol). Non-resistant to mineral oils. CR – NEOPRENE VMQ – SILICONE FKM – FLUOROELASTOMER Good heat, flame, aging and weather resistance. Moderate chemical and oil resistance. Long flex life. Poor resistance to aromatic hydrocarbons. Excellent electrical properties, resistant up to very high temperatures and flexible to very low temperatures. Poor tensile and abrasion resistance compared to other elastomers. Excellent long term heat resistance and aging. Excellent hot oil, aliphatic and aromatic hydrocarbon resistance. Not very elastic. High cost polymer. SBR URETHANE VITON Non-oil resistant, economically priced synthetic rubber – especially noted for its low water absorption properties. Outstanding tensile and abrasion qualities – excellent resistance to wear, ozone, oxygen, kerosene & gasoline. In addition to its ability to…
General Considerations
You can select from a broad choice of materials that will provide the compound best suited to your product application. Some examples are: NEOPRENE All purpose outdoor-indoor synthetic rubber resistant to most chemicals, oils, weathers, etc. EPDM Outdoor weather resistant even under extremely severe conditions, resistant to color fade, heat, electricity. NITRILE (Buna-N) Especially resistant to aromatic hydrocarbons, gasoline, petroleum oils, mineral and vegetable oils. SBR (Buna-S) Non oil resistant, economically priced synthetic rubber – especially noted for its low water absorption properties. NATURAL Extremely resilient with high tensile & elongation properties – also resistant to flexing, permanent set and electricity – used in food and beverage applications. URETHANE Outstanding tensile and abrasion qualities – excellent resistance to wear, ozone, oxygen, kerosene & gasoline. SILICONES Can withstand extreme heat or cold and retain flexibility – normal temperature range of -150 F to 550 F. VITON Will withstand extreme temperatures and is fuel and oil resistant.
Material Specifications
SUMMARY OF RMA DRAWING DESIGNATIONS Dimensional Tolerances (Tables 2-5) Relative Dimensions Finish (Table 6) Flash Extension (Table 7) Bonding (Specify Grade and Method on B1 and B2) (Tables 8 & 9) Load-Deflection Characteristic (Specify only when needed) (Table 10) Packaging A1 No Designation. SEE TEXT AND/OR YOUR RUBBER SUPPLIER. SPECIFY ONLY WHEN NEEDED. F1 T.00mm T.000 B1 D1 P1 A2 F2 T.08mm T003 B2 D2 P2 A3 F3 T.40mm T.16 B3 D3 P3 A4 F4 T.80mm T.32 B4 – – – – T1.60mm T.63 B5 – – – – T2.35mm T.93 – – – – – T00 T00 – – – RMA DRAWING DESIGNATION FOR FINISH Drawing Designation F1 A smooth, polished and uniform finish completely free of tool marks, dents, nicks and scratches, as produced from a highly polished steel mold. In areas where F1 is specified, the mold will be polished to a surfaced finish of 10 micro-inches (250nm) or better. F2 A uniform finish as produced from a polished steel mold. In areas where F2 is specified, the mold will be polished to a surface finish of 32 micro-inches (800nm) or better but with very small tool marks not polished out. F3 Surface of the mold…
Rubber Terminology
As an engineering material, elastomers offer elasticity and flexibility, toughness which provides wear, cut and abrasion resistance, physical strength, relative impermeability to liquids and gases, and oil and fuel resistance. An evaluation of physical properties of a given elastomer should be made in a specific compound under specific application conditions. However, as a general guide to comparative properties, material producers and rubber compounders can supply data based on “typical” recipes or compounds in standard tests. Hardness Hardness is determined by measuring the extent to which surface resists indentation by a standard indentor. It is an important property which has a relationship to modulus and tensile strength. Measurements are commonly made by Shore Durometer. Tensile Properties Tensile strength, in Mega pascals (pounds per square inch), measures the load per unit area of the original cross section to cause rupture. Elongation measures rubber strength. It expresses, by percent, the amount of increase over initial length at instant of rupture. Modulus, in Mega Pascals (pounds per square inch), is a measure of loading required to stretch a test specimen a standard amount, usually 100 to 300%. Compression Set A measure of the degree to which a test specimen under standard loading and time…
ASTM D2000 Callout
FAQ
General Do you have a standard parts catalog? We do not have a standard parts catalog. All of our products are custom made to customer specifications, although with the thousands of rubber parts we have produced, we may have a part similar to what you are looking for. Will I need to buy tooling or a mold to produce my product, and if so, how much do they cost? If we don’t have an existing mold to meet your requirements, we will have to build one. Mold costs vary widely based on the configuration of the part. Contact us for an estimate for your project. I have an existing mold; can you use it? In most cases, we can use an existing mold. In fact, in several cases we have helped reduce our customers’ costs by converting their compression or transfer molds to injection molds, reducing molding cycle times and reducing part price. Material How can do I select a material for my application? With years of experience working with a variety of material, we can help select the material that will best suit your needs while keeping material costs in mind. For more assistance, you can visit our material…
Glossary of Terms
Continuous Flow Epiclorohydrin EPDM Fluorinated Silicones Heijunka JIT Kaizen Kanban Muda Neoprene Nitrile Pull System SBR Silicone Standardized Work Vamac Viton® 5S Continuous Flow After identifying the value stream for a product, the focus is on avoiding batch and queue between different steps in the process flow. You must ensure that the next downstream operation has: only what is needed just when it is needed in the exact amount needed Enabling flow without interruption, detours, backflows, waiting and scrap presents a constant challenge. Generally, the batch size should be reduced to the smallest possible size. The end target is to enable single piece flow, meaning producing only one product at a time. The benefits of continuous flow are: improved response time to customer orders improved resource productivity improved quality reduced lead time reduced space (top of page) Epiclorohydrin Epichlorohydrin rubber is available as a homopolymer (CO) and a copolymer (ECO) of epichlorohydrin. Reinforced, these rubbers have moderate tensile strength and elongation properties, plus an unusual combination of other characteristics. One of these is low heat buildup, which makes them suitable for applications involving cyclic shock or vibration. The homopolymer has outstanding resistance to ozone, good resistance to swelling by oils,…
Rubber Molding Handbook 4th Edition
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JRW’s (Jefferson Rubber Works, Inc.) custom injection molding process and state-of-the-art technology enable us to produce custom molded rubber products with greater speed and efficiency than conventional rubber molding equipment. Utilizing superior engineering, JRW has the ability to work with a variety of OEM companies to design and craft customized solutions to meet the most difficult specifications with unparalleled accuracy.
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Rubber Injection Molding
Rubber Molding Handbook 4th Edition
RMA Handbook 4th Edition
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