LED covers and lenses
Clear or diffusing covers that seal a light source against water and dust.
LSR injection · Optical-grade LSR
Optical-grade LSR.
Clear silicone shows everything: flow lines, bubbles, dust and tool marks. Optical-grade LSR work is about tooling, handling and cleanliness as much as the material.
The detail
Why clear silicone
Optical LSR stays clear across a wide temperature range, doesn't yellow the way many plastics do, and is flexible enough to double as a seal. That combination suits LED lens covers, light guides, clear keypad windows and sight glasses.
The difficulty is that clarity is unforgiving. A tool polish that's fine for a black seal will show on a clear lens. We treat optical jobs as a separate category, with their own tool finish, handling and inspection.
Where it fits
Common optical parts
Light guides
Flexible guides that carry light from a board to a panel indicator.
Clear windows in keypads
Transparent sections in otherwise opaque keypads and buttons.
How we run it
What changes for optical work
Polished tool surfaces
Optical faces are polished to suit the finish you need, from clear to deliberately diffused.
Gate placement off the optical area
Gates and vents sit away from the faces light passes through.
Clean handling
Parts are handled with gloves, kept away from dust and packed so faces don't scuff.
Visual inspection under light
Parts are inspected under controlled lighting for bubbles, inclusions and flow marks.
To quote it
Helpful to know
Clear or diffused
Do you want to see through it, or spread the light evenly?
Which faces are optical
Mark them on the drawing so we can keep gates and parting lines away.
Operating temperature
Near hot LEDs, the grade choice matters.
Acceptance criteria
How many inclusions of what size are acceptable. We'll agree limit samples with you.
At a glance
The idea in a picture.
How overmoulding works
Swipe to see the whole diagram
Questions
What people usually ask.
Will clear silicone stay clear over time?
Optical-grade LSR is chosen for its stability. We'll talk you through the supplier's data for the grade we recommend.
Can you mould clear and coloured in one part?
Often, yes, through two-shot moulding or overmoulding a clear window into a coloured body.
Keep exploring
More from lsr injection.
LSR overmould
LSR flows easily, fills thin sections and bonds to many substrates when the grade and preparation are right. That makes it the usual choice…
Open this variantLSR micro parts
Some silicone parts weigh less than a paperclip. At that scale, handling, inspection and packing matter as much as the moulding itself.
Open this variantLSR injection overview
Two-part liquid silicone metered, mixed, injected cold and cured hot. The cleanest route we have for medical, wearable and electronics…
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