Tri-Clamp / Sanitary Silicone Gaskets
Manufacturer & Custom Solutions
Tri-Clamp / Sanitary Silicone Gaskets
Tri-clamp sanitary gaskets are the standard seal in hygienic pipework for dairy, beverage and pharma. ZSR Silicone makes these from FDA platinum-cured VMQ that withstands CIP and SIP cleaning. We stock common sizes and mold specials on demand.
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 |
Tri-Clamp Sizes and Standards
Tri-Clamp sizes are named after the tube outside diameter (OD) — not the clamp or the gasket size. One important detail: some sizes share the same flange end. A 1/2" and a 3/4" fitting use the same flange and the same gasket. A 1" and a 1.5" fitting also share one flange size. So always check both the tube OD and the flange OD before you order.
Standard Tri-Clamp Gasket Size Chart:
Tri-Clamp Size | Tube OD | Flange OD | Gasket ID (approx.) |
|---|---|---|---|
1/2" – 3/4" | 12.7 / 19.05 mm | 25.0 mm (0.98") | 9.5 / 16 mm |
1" | 25.4 mm | 50.5 mm (1.98") | 22.1 mm |
1.5" | 38.1 mm | 50.5 mm (1.98") | 34.8 mm |
2" | 50.8 mm | 64.0 mm (2.52") | 47.5 mm |
2.5" | 63.5 mm | 77.5 mm (3.05") | 60.2 mm |
3" | 76.2 mm | 91.0 mm (3.58") | 72.9 mm |
4" | 101.6 mm | 119.0 mm (4.68") | 97.4 mm |
6" | 152.4 mm | 167.0 mm (6.57") | 146.9 mm |
8" | 203.2 mm | 218.0 mm (8.57") | 197.6 mm |
10" | 254.0 mm | 268.5 mm (10.57") | 246.1 mm |
12" | 304.8 mm | 319.3 mm (12.57") | 300.0 mm |
Standards we cover: Our gaskets fit all common sanitary clamp systems — Tri-Clamp / Tri-Clover, ISO 2852, DIN 32676, BS 4825-3, and ASME BPE. We also make gaskets for other sanitary unions on request, including DIN 11851, SMS 1145, IDF/ISS, and RJT. Please note: these systems are not interchangeable with each other. Tell us your fitting standard or send us a sample gasket, and we will match it.
Gasket types: standard Type I gaskets (1/2"–12"), Type II flanged gaskets (1"–12"), envelope gaskets, and screen gaskets for filtering lines.
Sanitary Requirements and Surface Finish
In a sanitary line, a gasket does more than seal — it must stay clean. 3-A and EHEDG design rules require the gasket joint to be substantially flush with the tube bore, with no gaps or dead spaces where product or bacteria can hide. Over-compression pushes the gasket into the bore. Under-compression leaves a crevice. Both cause contamination risk and cleaning problems.
That is why we control three things on every sanitary gasket we make:
Accurate ID and thickness
so the gasket sits flush with the tube bore after clamping, within the tight limits sanitary rules ask for
Smooth, flash-free surfaces
no mold parting line, no flash, and no burr on the sealing face or the inner bore
Controlled compression design
for critical lines, we offer flanged and envelope gaskets that limit how far the gasket can be squeezed
Surface finish note
Sanitary fittings have their own surface finish grades — food lines often use 32 Ra, dairy and 3-A lines use 20 Ra or better, and pharmaceutical lines use 15 Ra with electropolish (ASME BPE SF4). Our silicone gaskets are made to match these joint designs, and our materials resist sticking and product build-up. All grades handle CIP (clean-in-place) chemicals and SIP (steam-in-place) cycles — steam up to 123°C for standard service.
Material Grades for Food and Pharma
We offer three material levels, so you pay only for the grade you really need:
Grade | Compliance | Cure System | Best For |
|---|---|---|---|
Food Grade Silicone | FDA 21 CFR 177.2600 | Peroxide or platinum | Dairy, beverage, brewery, food lines |
Pharma Grade Silicone | FDA 21 CFR 177.2600 + USP Class VI + ISO 10993 | Platinum cured | Pharma, biotech, WFI, high purity water |
Metal Detectable Silicone | FDA 21 CFR 177.2600, detectable by standard metal detectors | Peroxide | Food plants with HACCP programs |
Why platinum cured for pharma?
Platinum curing leaves almost no by-products in the rubber. The gasket is non-pyrogenic, odorless, tasteless, non-leaching, and free of pigments and plasticizers. It also handles steam sterilization better and lasts longer in SIP cycles.
Documents we provide: Certificate of Analysis (CoA) with every batch, Declaration of Compliance for FDA 21 CFR 177.2600, and full lot traceability from raw material to finished gasket. All pharma grade material is ADI-free (no animal-derived ingredients) and produced under cGMP-aligned controls.
What Is a Tri-Clamp / Sanitary Silicone Gasket?
A Tri-Clamp silicone gasket is a soft sealing ring used in sanitary clamp fittings — the quick-release couplings you see in food, beverage, dairy, brewery, and pharmaceutical plants. The gasket sits in a groove between two stainless steel ferrules. A hinged clamp closes around the joint and presses the gasket into a tight, hygienic seal.
The big advantage of this design is speed. There are no bolts and no tools needed. Workers can open the joint, change the gasket, clean the line, and close it again in seconds. That is why Tri-Clamp connections are the standard choice wherever equipment must be cleaned often.
Silicone is the classic gasket material for these joints, and for good reasons. It stays soft and elastic, so it seals well at low clamp force. It handles hot products, freezers, CIP cleaning chemicals, and SIP steam up to 123°C. It adds no taste, no smell, and no color to the product. And in food grade or pharma grade compounds, it meets the strict rules of FDA 21 CFR 177.2600, USP Class VI, and 3-A sanitary standards.
One thing to know
a sanitary gasket is not only about the material — it is also about the fit. The gasket must sit flush with the tube bore, with no gap and no squeeze-out into the product path. At ZSR Silicone Parts, we cut and mold every sanitary gasket in our own factory, with tight ID and thickness control, smooth surfaces, and batch-by-batch quality checks. Standard sizes from 1/2" to 12" ship fast, and food grade, pharma grade, and metal detectable materials are all in stock. Tell us your size and your line's product — we will send a quote within 24 hours.