Southwest

Valves And Pump Parts

Southwest has a long history of producing high quality plastic valves and pump parts. with a trusted name in the custom ... read more »

Heat Resistant Plastic Parts

The Thermoset family of plastic materials harden and cure in the molding process as the molecules actually crosslink in ... read more »
Featured Campaign
We are looking for plastic injection molding companies that would be interested in being acquired by Southwest Plastics read more »

Leaders In Injection Molding, Compression Molding & Transfer Molding

Plastic Injection Molding

When plastic parts require engineered Thermoplastic materials and need precise manufacturing and control, rely on Southwest Plastics to do plastic Injection molding.  Specialist in handling critical parts with unique properties Southwest Plastic injection molding expertise is ideal for both demanding and general thermoplastic production of all volumes.

Compression Molding

Southwest Plastics is an expert in custom compression molded parts made with all Thermoset plastic materials which harden and cure in the manufacturing process. Parts that operate in a high heat environment where softening or melting cannot be tolerated are best manufactured using our transfer molding, compression molding and injection molding techniques.

Thermoset Injection Molding

The Thermoset family of plastic materials harden and cure in the molding process as the molecules actually crosslink in a chemical reaction and set into a final shape. No addition of heat will soften or melt the material. As a result, thermosets have their advantage in any high heat environment where softening or melting cannot be tolerated.

Southwest Plastics Keeps Plastic Injection Molding In California

For many years a growing number of manufacturers needing custom injection plastic molded parts looked to China for all their plastic needs. Southwest Plastics located in Glendora CA near Los Angeles has the knowledge, experience and equipment to create procession part using Plastics Injection Molding, Compression Molding, and Transfer Molding at a great value.

Here are eight good reasons to manufacture in Los Angeles, California:

But… Sometimes it is best to manufacture in China or Asia,

Southwest Plastics has developed partnerships with precision plastic manufacturers so that you can successfully facilitate your work there,
reducing cost and risk.


Specializing in custom injection molding, thermoplastic molding and custom compression molding, Southwest Plastics, located in Glendora California, has served thousands of customers in the United States and worldwide. We are an ideal vendor for all your parts that are precision plastic injection molded.

Southwest plastics deliver precision components on time and to specification. Our experienced team delivers a high level of customer care to clients of all sizes. Southwest Plastics is ISO 9001-qualified in the areas of plastic injection molding, plastic injection compression molding, and plastic transfer molding.