Seals with mating housings
Sealing lips and beads that must line up with a groove every time.
Silicone injection (HCR) · Precision injection
Precision injection.
Rubber moves, shrinks and flexes, so precision in silicone means something different from precision in metal. It means parts that come out the same, batch after batch, and fit the thing they're meant to fit.
The detail
Precision in a flexible material
We don't publish tolerance figures as a headline. What's achievable depends on the grade, the wall section, the size of the feature and how the part is measured — a soft seal measured free-state behaves very differently from a firm part measured in a fixture.
What we do promise is a documented approach: shrinkage modelled for your grade, tool steel finished to suit, a measurement method agreed before first article, and results recorded for every batch.
Where it fits
Typical precision work
Fine ribs and features
Thin ribs, small bosses and textured areas that need consistent fill.
Parts for automated assembly
Components fed by machine, where consistent size matters more than absolute size.
How we run it
How we make precision repeatable
Agree the measurement method
Which features matter, how they're measured, free-state or fixtured. Written down before the tool is cut.
Tool for your grade's shrinkage
Cavity dimensions allow for the shrinkage of the specific grade you've chosen.
Tight process windows
Temperature, pressure and cure time held in a narrow window and recorded.
Batch measurement
Critical features measured on every batch and trended, so drift is caught before it matters.
To quote it
What helps us quote
The critical features
Mark the handful of dimensions that really matter. Tightening everything adds cost without benefit.
The mating part
A sample or drawing of what it fits into tells us more than a tolerance block.
How you'll inspect at goods-in
We'll match our method to yours so results agree.
The grade
Different grades shrink differently. If it isn't fixed yet, we'll help choose. See our tolerances guide.
Questions
What people usually ask.
Why won't you give a tolerance figure up front?
Because an honest figure depends on your part. We'd rather agree a realistic, measurable specification for your geometry than quote a number that only applies to a test block.
Is LSR more precise than HCR?
Often more repeatable on thin, fine features. HCR can be just as consistent on firmer, chunkier parts. We choose per part.
Keep exploring
More from silicone injection (hcr).
HCR injection
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Open this variantMulti-cavity injection
More cavities means more parts per cycle and a lower cost per part. It also means a more expensive tool and more places for things to vary.…
Open this variantSilicone injection (HCR) overview
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Back to the overviewDesigned and developed in the UK. UK moulding capability, with some higher-volume production placed with trusted partners where that's the right commercial answer.
Get in touch
Tell us the part, the volume, and the timeline.
Rough annual volume, target unit price, and any deadlines. That's enough to work out whether compression, LSR injection or something else is the right tool.
Real people, a real workshop
You deal with the people who make it.
No call centre and no middlemen. When you contact TCI Products, you speak to the team who design, build and check your mould.
- A real Warwickshire workshopUnit 15, Waterloo Park, Bidford-on-Avon, Alcester B50 4JG.
- Real people on the phoneCall the team on 01789 224228, Monday to Friday.
- The same team on every jobDesign, production and aftercare come from the people you see here.
- Part of TCI GroupFive specialist brands, one engineering team. Visit TCI Group.
Thomas LaneManaging Director
George PrestonDesign & Project Manager
Kelly BallingerHead of Partnerships
Jim AndertonProduction Manager
TheodoreEmployee Welfare