DIN 2690 Silicone Gasket
Manufacturer & Custom Solutions
Flat Gaskets for PN Flanges
DIN 2690 is the old German standard for flat flange gaskets, now replaced by EN 1514-1, but many buyers still search for it. Gaskets for this standard are usually made from compressed fiber sheet, rubber or PTFE. Silicone is a better choice when the line carries food, or when the flange sees very low or very high temperatures, because silicone works from -60°C to +200°C and is safe for food contact. ZSR produces silicone flat gaskets to DIN 2690 and EN 1514-1 dimensions for PN6 to PN40 flanges. Common DN sizes are in stock for fast delivery. Just tell us your flange DN and PN, and we will do the rest.
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 |
Understanding PN Flanges and DIN 2690
DIN 2690 is the German standard for flat gaskets used on PN-designated pipe flanges — covering ratings from PN10 up to PN100 (PN10, PN16, PN25, PN40, PN63, PN100).
What does PN mean?
PN stands for Pressure Nominal — the European pressure rating system. The number is roughly the maximum working pressure in bar at room temperature: a PN16 flange handles about 16 bar, a PN40 flange about 40 bar. As temperature rises, the allowed pressure drops, following the flange standard's rating tables.
What does DN mean?
DN stands for Diameter Nominal — the nominal pipe bore in millimeters. DN100 means a pipe of roughly 100 mm bore. Every DIN 2690 gasket is sized to its DN number and its PN rating.
At ZSR Silicone Parts, we manufacture DIN 2690 silicone gaskets for DN sizes from DN10 to DN1000 and larger — cut to standard dimensions, with food grade material available for the food and water lines where these flanges are so common.
DN Size and Gasket Dimensions
The gasket's inner diameter follows the DN number; the outer diameter grows with the PN rating — higher pressure flanges are bigger and need bigger gaskets. Common sizes (IBC ring type, mm):
DN | Gasket ID | OD for PN10 / PN16 | OD for PN25 / PN40 | Standard Thickness |
|---|---|---|---|---|
DN15 | 22 | 50 | 51 | 1.5 / 2 / 3 mm |
DN20 | 28 | 60 | 61 | 1.5 / 2 / 3 mm |
DN25 | 35 | 70 | 71 | 1.5 / 2 / 3 mm |
DN40 | 49 | 92 | 92 | 1.5 / 2 / 3 mm |
DN50 | 61 | 107 | 107 | 1.5 / 2 / 3 mm |
DN65 | 77 | 127 | 127 | 1.5 / 2 / 3 mm |
DN80 | 90 | 142 | 142 | 1.5 / 2 / 3 mm |
DN100 | 115 | 162 | 168 | 1.5 / 2 / 3 mm |
DN125 | 141 | 192 | 194 | 2 / 3 mm |
DN150 | 169 | 218 | 224 | 2 / 3 mm |
DN200 | 220 | 273 | 284 – 290 | 2 / 3 mm |
DN250 | 274 | 329 | 340 – 352 | 2 / 3 mm |
DN300 | 325 | 384 | 400 – 417 | 2 / 3 mm |
PN25 and PN40 outer diameters start to differ at DN200 and above — tell us your exact PN rating and we confirm the dimension. Full charts for all DN and PN combinations are available on request.
About higher PN ratings
Higher pressure means higher bolt load. For PN40 and above, we recommend thicker gaskets (3 mm) or our fiberglass reinforced silicone, which resists extrusion under heavy bolting.
Fast production
ZSR keeps cutting templates for the common DN sizes on file. Standard sizes move straight to cutting — no setup delay, short lead times, and common sizes ship from stock.
DIN 2690 vs EN 1514-1
Buyers often meet both names for what looks like the same gasket. Here is the relationship:
Factor | DIN 2690 | EN 1514-1 |
|---|---|---|
Status | Older German standard, officially withdrawn | Current harmonized European standard |
Region | Germany and legacy European plants | All EU projects and new installations |
Dimensions | The original size system | Largely the same — IDs are identical or very close for most DN sizes |
Tolerances | Standard of its time | Tighter, more formal tolerance and marking requirements |
Gasket Types | Flat ring and full face | Formally defines IBC, FF, TG (tongue-and-groove), and SR (spigot-recess) types |
Typical Buyer | Maintenance, spare parts, older drawings | New projects, engineering specifications |
What this means for you
In most cases, a gasket made to one standard physically fits the other's flanges — the dimensions are the same or within a millimeter. But if your drawing or your customer's specification says EN 1514-1, order EN 1514-1; if an old German drawing says DIN 2690, we make that.
ZSR manufactures to both standards. Not sure which one your flange needs? Send us the drawing number, the old gasket, or simply the DN and PN — we will confirm the right standard before production.
What Is DIN 2690?
DIN 2690 is a classic German standard for flat gaskets on PN pipe flanges. Published by DIN, the German Institute for Standardization, it fixed the inner and outer diameters of nonmetallic flat gaskets for every DN size and PN pressure rating — so a gasket from any maker would fit any PN flange built to the matching German standards. Although it has been officially withdrawn and replaced by the European standard EN 1514-1, DIN 2690 never really left: thousands of drawings, spare parts lists, and maintenance manuals across Europe and beyond still call for it by name. It remains one of the most searched gasket standards in the replacement market.
Key Points of the Standard
At ZSR Silicone Parts, we cut silicone gaskets to DIN 2690 dimensions every week — from DN10 instrument flanges to DN1000 pipelines, with common sizes in stock. Tell us your DN, your PN, and your medium — we will send a quote within 24 hours.