Company Profiles

One Company – “Three Technologies Strong”

Reliance Engineering, Built-Rite Tool Die and LSR Engineering is an integrated Plastics Technology Company with expertise in Plastic Part Design, Mold Design, Mold Making, and Plastic Processing. Each Division of the Company is a highly regarded specialist in its core discipline.

Each division of the company is equipped with state of the art machine tools and employs the latest technologies in delivering quality parts to our customers. We specialize in demanding applications that are critical to the success of our customer’s products. Our customers benefit from our commitment to innovation which provides them with superior technical solutions.

Our success is founded on extreme customer service and the delivery of unsurpassed quality products. We achieve this through Determination, Imagination and Extreme Technical Experience in our field. Call us for a consultation and quotation. We are confident that you will be completely satisfied with our service and expertise.


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Built-Rite Tool & Die is a custom Mold Making and Design firm. Built-Rite is the corporate parent and driving force behind Reliance Engineering and the LSR Engineering Divisions. Built-Rite is staffed with highly skilled engineers, designers, and mold makers ready to execute your most demanding design challenge.

Founded in 1984 Built-Rite is a leader in the manufacturing of precision molds for the Liquid Injection Molding of LSR, Liquid Silicone Rubber, Injection Molding of Thermoplastics and Thermosets and Compression and Transfer Molding of Thermoset plastic materials.

Built-Rite Tool & Die is located in Lancaster, Massachusetts just minutes from Interstate 190.

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Reliance Engineering is a specialized custom molder of Thermoplastics and Thermoset Plastic Materials. Reliance focuses on demanding applications that require high temperature plastic materials and very close tolerance molding. Many of these same applications require Insert Molding which is one of our core disciplines. Reliance Engineering is unique in offering both Thermoplastic and Thermoset molding capabilities coupled with Insert Molding. Injection Molding, Compression Molding, Transfer Molding and Insert Molding are our passion. We have a strong background in material selection, together with part design for moldability.

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LSR Engineering is a specialized custom molder of Liquid Silicone Rubber. LSR Engineering focuses on demanding applications that require high temperature plastic materials and very close tolerance molding. LSR is a proprietary name for a range of two-component Liquid Silicone Rubbers used to produce elastomer parts via injection molding. Working closely with our Built-Rite Tool & Die division we produce precision molds for applications requiring high cavitation, Insert Molding/Over Molding of plastic and metal parts and low cavitation/prototype parts. Because of its high thermal stability, resistance to compressive set and chemical resistance to aging, LSR is the material of choice for many applications and industries like medical, military, electronics, appliance and automotive industries.

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