09 August 2018
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Taking the big LeeP

Increasingly, engineers are seeing the benefits of plastic spring technology as exemplified by Lee Spring in its LeeP range.

By offering non-magnetic, non-corrosive and chemically inert properties in a lightweight package, LeeP springs are described as often a complete solution for applications in areas of medical device manufacturing, pharmaceutical equipment, aerospace and lightweight – eg, portable instrumentation.

The LeeP range combines the strength of metal springs with the attributes of high-performing engineered thermoplastics – in this case, Ultem PEI (polyetherimide) resin, which has excellent thermal stability and electrical insulation properties, while being non-contaminating. They have low flammability and are recyclable in compliance with global regulations, including RoHS and REACH.

LeeP Plastic Composite Springs are stocked in a variety of standard sizes, each available in a ‘rainbow’ of strengths formulated from different Ultem resins. The five increasing strengths are easily identifiable by distinct colours: red, orange, yellow, green and violet.

These plastic compression springs offer high strength-to-weight ratios that optimise performance, while reducing mass; they are said to have excellent stability of physical and mechanical properties at elevated temperatures up to 170°C; high corrosion resistance and are generally compatible with many chemicals, including strong acids, weak bases, aromatics, and ketones.

Their non-magnetic material does not interfere with imaging and other ferro-sensitive technologies and, being of a dielectric insulating material, they are suitable for non-conductive applications; while being inert and non-contaminating, this plastic composite protects purity of the products they come in contact with.

Other applications include: medical products and processing equipment, pharmaceutical delivery devices, imaging and X-Ray equipment, food processing and packaging equipment, aerospace products, marine products, electronics and electrical equipment, water purification systems, chemical environments, automotive interiors, pollution control systems, semi-conductors, instrumentation, communication devices, and cosmetics packaging equipment.

Brian Wall

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Lee Spring Ltd


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