Injection Molded Plastics/

Gas Assist Injection Molding

Gas assist injection molding is a low-pressure process in which inert gas, such as nitrogen, is forced into the melt while it is entering the mold, packing the plastic into the cavities. This process is used to either create hollow channels within plastic parts or to consolidate the part for applications such as automotive parts, computer enclosures, consumer appliances, office equipment panels and medical components.

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GSH Industries, Inc.
Cleveland, OH
440-238-3009
GSH Industries is a supplier of injection molded plastics and plastic coatings. We serve a wide range of industries such as automotive, consumer, electrical, and more, with innovative custom injection molding. Visit our website today for more information on our plastic injection molded parts. Our experience with plastic injected moldings has allowed us to position ourselves into the next century.
 
Caplugs
Buffalo, NY
888-227-5847
Caplugs offers the largest, most expansive line of injection molded plastics. Stocked caps, plugs, tubes, wraps, edge liners & nettings, plus extensive custom capabilities. Injection molding presses from 7 to 400 tons. Small, high precision injection molded parts & up to 18" diameter. We are pioneers in the industry by experimenting with materials & molding techniques to make parts that perform.
 
All-State Plastics
City of Industry, CA
800-544-0370
With over 30 years of experience, All-States Plastics has specialized in plastic molding, mold making and machining. On top of our numerous capabilities, our customer service is unbeatable. We have the know-how you need and continue fine tuning to surpass our high standards for customer service & manufacture injection plastic moldings. We are armed with expanded visions of what yet may be.
 
Total Quality Plastics, Inc.
North Prairie, WI
888-335-9769
ISO 9001:2000 certified plastic molding company with complete, cutting-edge capabilities for small intricate molded plastic components to large parts (1500 tons). We specialize in insert molding, in-mold decorating, over-molding, gas-assist, ultrasonic welding, machining, hot stamping, pad printing & others. Full product development, testing & prototyping capabilities, plus stocking programs.
 
Xcentric Mold & Engineering, Inc.
Chesterfield, MI
586-598-4636
Xcentric Mold & Engineering makes buying custom plastic injection molded parts more convenient than ever. ISO 9001:2008 certified, we are leaders in rapid prototype & rapid injection molding with low cost production. No matter what kind of part you need, no matter how complicated, we`ll put it in your hands faster. Our molding expertise means no geometry limits for quality parts done right.
 
Penguin, LLC
Sturgis, MI
269-651-9488
With injection molding presses from 260 ton to 1000 ton, Penguin has the ability & resources for every step of your plastic molding requirements - from a competitive part quote to part & product development support start to finish. Penguin has an established infrastructure like no other. We can simply mold parts for you or completely assemble & ship your finished products anywhere in the world.
 

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Sturgis Molded Products
Sturgis, MI
269-651-9381
Sturgis Molded Products (SMP) is your innovative partner in plastic injection molding. With the latest technologies in scientific molding, our in-house services include tool design, production & prototype tool building, engineering and full product launch support. SMP serves the industrial, medical, automotive & consumer markets, bringing cost effective plastic solutions. Call us for your needs.
 
Johnson Plastics
Harrison, AR
870-741-5087
Since 1971, Johnson Manufacturing has been a custom plastic injection molding company with a nation-wide reputation. Manufacturing anything from shopping carts to caster wheels to agricultural tools, we specialize in filling your needs, whatever they are. We have experience with the use of polyethylene, polypropylene, styrene, polycarbonate, nylon and other materials. Call today for more details.
 
Britech Injection Molded Plastics
Stuart, FL
772-286-9278
For over 25 years, Britech, a supplier & manufacturer of injection molded plastics, has specialized in helping customers succeed in the low inventory, J-I-T environment of industrial production. Our rapid plastic molding process gives design engineers a fast & affordable way to get real injection molded parts in low volume quantities. We specialize in custom injection molded thermoplastic parts.
 
Hi-Tech Mold and Tool, Inc.
Pittsfield, MA
413-443-9184
Hi-Tech Mold & Tool was established in 1983. We are a full service injection molder of engineering thermoplastics and silicone, supplying custom molded parts for a variety of markets including Medical, Aerospace, Telecommunications, Electronics and more. We have a comprehensive secondary operations department for assembly, finishing, and packaging. We are ISO 9001:2000 and AS9100 certified.
 
American Precision Products
Huntsville, AL
800-889-7674
American Precision Products is a custom injection molding firm offering expert solutions in thermoplastic, thermoplastic elastomer & thermoset moldings. For commercial & government applications we provide short & long molding runs. Specialties include injection molding, insert molding, tight tolerance requirements, assembly & contract manufacturing. Contact us for all your molding & forming needs.
 
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Gas Assist Injection Molding

A fairly recent technology, gas assist injection molding has been around for about two decades, although it has only become widely used in the past few years. Originally developed to overcome the limitations of conventional molding processes, gas assist injection molding has already helped such industries as medical and automotive expand their product capabilities. Gas assist injection molding is used to mold plastics, typically thermoplastics, including polypropylene, polycarbonate, ABS, HIPS and nylon. Some advantages of gas assist injection molding include material savings and reduced cycle times, while some disadvantages include the high cost of tooling and the extra care that must be taken when designing parts.

Although there are many types of gas assist injection molding, they all fall into two main categories: internal gas injection and external gas injection. The more common of the two processes, internal gas injection involves injecting the inert gas directly into the cavity of the component and thus creating hollow channels. Internal gas injection eliminates sink marks and offers improved dimensional stability as well as less wear on molds. External gas injection involves injecting the inert gas within the mold cavity, but on the outside surface of the part creating consolidation. External gas injection allows for improved dimensional stability and the elimination of sink marks as well, but also provides expanded design capabilities such as flat polyethylene and polypropylene components that would not be possible through any other molding processes. Some of the additional types of gas assist injection molding include short-shot molding and full-shot molding. In short-shot molding, the cavity is pre-filled with plastic melt, which is then followed by the injection of the gas. In full-shot molding, only after the cavity is completely filled with plastic melt is the gas injected into the cavity.