Soft-touch housings
Grip areas and bumpers on handheld devices and tools.
LSR injection · LSR overmould
LSR overmoulding.
LSR flows easily, fills thin sections and bonds to many substrates when the grade and preparation are right. That makes it the usual choice for soft-touch surfaces and seals moulded straight onto a rigid part.
The detail
Getting the bond right
The bond is the whole point of overmoulding, and it depends on three things: the substrate material, the LSR grade, and what happens to the substrate before it goes in the tool. Self-bonding LSR grades exist for many engineering plastics; others need a primer.
The substrate also has to survive the tool temperature without distorting. We check that early, because a housing that warps in the tool can't be fixed by better silicone.
Where it fits
Where LSR overmould fits
Integrated seals
A seal moulded onto a housing so there's no loose gasket to fit or lose.
Medical and wellness parts
Skin-contact surfaces on rigid bodies, in documented grades.
How we run it
How we run it
Substrate review
Material, heat tolerance and surface condition checked against the LSR grade.
Bond strategy
Self-bonding grade, primer, mechanical interlock, or a combination.
Load and mould
Substrates are loaded into the tool, often by fixture, and the LSR is injected around them.
Bond testing
Peel or pull tests on samples from each batch, recorded against the batch.
To quote it
To quote it
The substrate material
Exact grade if you know it. Different nylons, for instance, bond differently.
Who supplies the substrate
Your plastic moulder, or us through the partner network.
Where the silicone goes
Coverage, thickness and any areas that must stay clean.
How the bond will be tested
Your drop, peel or ageing test.
At a glance
The idea in a picture.
How overmoulding works
Swipe to see the whole diagram
Questions
What people usually ask.
Can LSR bond to metal?
Yes, usually with a primer and a mechanical lock designed into the metal part.
What's the difference between this and overmoulding generally?
This page is about liquid silicone specifically. Our overmoulding page covers solid silicone and rubber routes too.
Keep exploring
More from lsr injection.
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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