Custom Molded Silicone Gaskets
Manufacturer & Custom Solutions
Molded Silicone Gaskets
For three-dimensional gasket shapes, ZSR Silicone uses compression and injection molding. We build the mold, run first-article samples, and scale to production. Molded gaskets offer better corner sealing and integrated features than flat-cut parts.
FDA 21 CFR 177.2600
Rubber Articles Intended for Repeated Use
LFGB 30&31
EU Food Contact Materials
USP Class VI / ISO 10993
Biocompatibility of Medical Devices
RoHS / REACH
Environmental Compliance
UL 94
Flammability of Plastic Materials
Built to Your Exact Spec
Custom Silicone Gaskets Options
| Image | Product | Type | Short Info | Action |
|---|---|---|---|---|
 | DIN 32676 Silicone Gasket | Standard & Size | DIN 32676 tri-clamp silicone gaskets, FDA food grade, full size range in stock at ZSR factory. | View Details |
 | AS568 Standard Silicone Gaskets | Standard & Size | AS568 standard-size silicone gaskets for groove-based sealing applications. | View Details |
 | DIN 3869 Silicone Sealing Ring | Standard & Size | DIN 3869 profile sealing rings in silicone for hydraulic ports, working from -60°C to +200°C. | View Details |
 | EN 1514-1 Silicone Gasket | Standard & Size | EN 1514-1 silicone flat gaskets for PN flanges, IBC and FF types, standard and custom sizes. | View Details |
 | Custom Die Cut Silicone Gaskets | Standard & Size | Flat silicone gaskets cut to any shape from sheet stock. Precision cutting for exact fits. | View Details |
 | ISO 7483 Silicone Gasket | Standard & Size | Silicone gaskets to ISO 7483 for ISO 7005 flanges, made for international projects and tenders. | View Details |
 | Custom Molded Silicone Gaskets | Standard & Size | Three-dimensional silicone gaskets made by compression or injection molding. For complex sealing shapes. | View Details |
 | ISO 1127 Silicone Gasket | Standard & Size | Sanitary silicone gaskets matched to ISO 1127 stainless steel tube sizes for food and pharma lines. | View Details |
 | Standard Flange Silicone Gaskets | Standard & Size | Silicone gaskets cut to fit pipe flanges. Matches ANSI, DIN and JIS bolt patterns. | View Details |
 | B16.21 Silicone Gasket | Standard & Size | ZSR makes silicone gaskets to ASME B16.21, ring type and full face type, for Class 150 to 2500 pipe flanges. | View Details |
 | ISO 2852 Silicone Gasket | Standard & Size | ISO 2852 silicone clamp gaskets for food industry couplings, FDA grade, factory direct from ZSR. | View Details |
 | Tri-Clamp / Sanitary Silicone Gaskets | Standard & Size | Hygienic silicone gaskets for food and pharmaceutical pipe connections. CIP and SIP compatible. | View Details |
 | B16.5 Silicone Gasket | Standard & Size | Silicone gaskets from ZSR sized to fit ASME B16.5 flanges, NPS 1/2 to 24 inch, Class 150 to 2500. | View Details |
 | Metric Size Silicone Gaskets | Standard & Size | Metric dimension silicone gaskets for international equipment standards. | View Details |
 | DIN 7603 Silicone Sealing Ring | Standard & Size | Flat silicone sealing rings made to DIN 7603 for screw plugs, banjo bolts and threaded fittings. | View Details |
 | DIN 2690 Silicone Gasket | Standard & Size | Silicone flat gaskets to DIN 2690 / EN 1514-1 dimensions for PN6 to PN40 flanges, food grade available. | View Details |
 | DIN 2691 Silicone Gasket | Standard & Size | Silicone gaskets made to DIN 2691 for tongue and groove flanges PN10 to PN160, ideal for plant repair. | View Details |
 | DIN 11851 Silicone Gasket | Standard & Size | Food grade silicone gaskets for DIN 11851 sanitary unions, DN10 to DN150, FDA material. | View Details |
 | FDA Food Grade Silicone Gasket | Grade | Food-safe silicone gaskets for processing equipment. FDA-compliant and taste-neutral. | View Details |
 | Medical Grade Silicone Gasket | Grade | Biocompatible silicone gaskets for medical devices. Sterilizable with full documentation. | View Details |
 | Industrial Grade Silicone Gasket | Grade | General-purpose silicone gaskets for industrial sealing. Reliable, durable and cost-effective. | View Details |
 | High Temperature / Heat Resistant Silicone Gaskets | Special Function | Heat-resistant silicone gaskets rated for continuous use above 200°C. For ovens and furnaces. | View Details |
 | Flame Retardant Silicone Gaskets | Special Function | Self-extinguishing silicone gaskets meeting UL 94 V-0. For fire-safety applications. | View Details |
 | Solid Silicone Rubber Gaskets | Materials | Solid silicone rubber gaskets with excellent compression set resistance and long service life. | View Details |
 | Fluorosilicone (FVMQ) Gaskets | Materials | Fuel and solvent-resistant silicone gaskets for chemical processing and automotive applications. | View Details |
 | Transparent / Clear Silicone Gaskets | Color | Clear silicone gaskets for visible sealing and light-transmitting applications. | View Details |
 | Black / White Silicone Gaskets | Color | Standard black and white silicone gaskets. Fastest delivery from stock. | View Details |
Compression Molding vs. Injection Molding
At ZSR Silicone Parts, we run both compression molding and injection molding in our own factory. Each process has its strong points. This table helps you see the difference:
Factor | Compression Molding | Injection Molding (LSR / HCR) |
|---|---|---|
Tooling Cost | Lower — simple mold design | Higher — mold with runner and gate system |
Mold Lead Time | Shorter | Longer |
Cycle Speed | Slower — manual loading | Fast — automatic cycles |
Unit Cost | Higher at big volumes | Lower at big volumes |
Best Order Size | Small to medium batches | Medium to very large runs |
Part Complexity | Simple to medium shapes | Complex shapes, fine details |
Flash / Waste | More flash, needs trimming | Very little flash |
Tolerance | Good | Better, very stable part to part |
Material Forms | Solid silicone (HCR), all grades | LSR or HCR compounds |
Our advice
Choose compression molding for large gaskets, simple shapes, or smaller orders — it keeps your tooling budget low. Choose injection molding for high volumes, complex designs, or when you need the same size on every single part. Send us your drawing and order quantity, and our engineers will pick the right process for you — this advice is free.
When to Choose Molded Over Die Cut
Die cutting is great for flat gaskets. But molding is the better choice when your project needs more:
3D shapes
sealing lips, ribs, grooves, rounded edges, and curved cross-sections that a knife simply cannot cut
Tighter, more stable tolerances
the gasket thickness is set by the mold cavity, not by a sheet. Every part comes out the same, down to ±0.05–0.1 mm on key sizes
Any material you want
molding starts from raw compound, not from stock sheets. Food grade, medical grade, high temperature, conductive, or fluorosilicone — the choice is yours
Better sealing with less force
a round or lip-shaped cross-section seals with much lower closure force than a flat sheet gasket, so your housing will not bend or warp
Lower unit cost on big orders
once the mold is paid for, the cost per gasket drops fast, especially with multi-cavity molds
Fully cured material
each gasket cures inside the mold at the right time and temperature. This gives lower compression set and a longer seal life than standard sheet stock
Less waste at volume
die cutting leaves a lot of scrap around the cut shape. Molding uses almost only the material inside the part. At high volumes, this saves real money
Rule of thumb
If your gasket is flat and your order is small, die cut it. If your gasket has any 3D feature, or your yearly volume is large, molding will give you a better part at a better long-term price.
What Is a Molded Silicone Gasket?
A molded silicone gasket is a sealing part made by shaping raw silicone rubber inside a heated metal mold. The mold gives the gasket its exact shape, size, and surface — flat or 3D, simple or complex.
The process works like this. We place uncured silicone compound into the mold cavity, or inject it in as a liquid. The mold closes, and heat and pressure cure the silicone into its final form. When the mold opens, the gasket is done — with its shape locked in by the mold, accurate and repeatable from the first part to the millionth.
Unlike a die cut gasket, which is cut from a ready-made sheet, a molded gasket can have almost any shape. Sealing lips, ribs, grooves, rounded cross-sections, mounting tabs, and special profiles are all possible. This makes molded gaskets the first choice for demanding seals: enclosures that must keep water out, machines that run hot, and products where a leak is not an option.
Molded silicone gaskets keep all the natural strengths of silicone rubber. They work from -60°C to over 200°C, resist UV and ozone, stay flexible for years, and can be made in FDA food grade or medical grade compounds. With the right material, they can also handle fuel contact, high voltage insulation, or EMI shielding.
At ZSR Silicone Parts, we design and build our own molds in-house, and we run both compression and injection molding lines. That means faster tooling, better quality control, and a fair price for you. Send us your 2D drawing, 3D file, or a sample — we will give you a free DFM review and a quote, usually within 24 hours.
