Navigate the full sealing and packaging technical reference below.
Sealing and packaging materials are critical components for leak prevention, joint integrity and equipment protection in industrial piping systems, pressure vessels, flanges and mechanical assemblies. Kennkrupps supplies a comprehensive range of gaskets, O-rings, tapes and packing materials for oil & gas, petrochemical, power generation, food and pharmaceutical industries.
From spiral wound gaskets for high-pressure flanges to food-grade PTFE tapes and instrumentation O-rings, our sealing products are manufactured as per ASME B16.20, AS568, ISO 3601 and other international standards.
Complete gasket, O-ring, tape and packing solutions for every sealing application.
Metallic winding with filler material — the most common gasket for high-pressure flange connections.
½" – 72"Compressed fiber, PTFE or rubber sheet material — die-cut or hand-cut to any flange size and shape.
½" – 24"Precision-molded elastomer rings — for static and dynamic sealing in hydraulic, pneumatic and instrumentation systems.
5mm – 200mmVirgin and filled PTFE tape — for sealing threaded pipe connections in plumbing, gas and industrial applications.
12mm – 25mmNatural hemp fiber impregnated with grease — for valve stem packing and adjustable gland sealing.
3mm – 25mmG10/phenolic gasket, sleeves and washers — for electrically isolating flange joints in cathodic protection systems.
½" – 24"Flexible graphite with or without metal insert — for extreme temperature and high-pressure steam service.
½" – 48"Solid metal ring gaskets — oval and octagonal profiles for high-pressure API and NACE flange connections.
½" – 24"Elastomer gaskets in NBR, EPDM, FKM and silicone — for water, air, chemical and low-pressure service.
½" – 24"VCI wrap, polyethylene, bubble wrap, foam, wooden crates — for secure industrial product packaging and transit.
Custom sizesSpiral wound gasket dimensions, O-ring sizes and RTJ specifications.
| NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Tolerance | Pressure Class |
|---|---|---|---|---|---|
| ½" | 15 | 31.8 | 19.1 | ±0.5mm | 150# – 2500# |
| ¾" | 20 | 42.9 | 25.4 | ±0.5mm | 150# – 2500# |
| 1" | 25 | 50.8 | 31.8 | ±0.5mm | 150# – 2500# |
| 1½" | 40 | 73.0 | 50.8 | ±0.5mm | 150# – 2500# |
| 2" | 50 | 92.1 | 66.7 | ±0.5mm | 150# – 2500# |
| 3" | 80 | 127.0 | 98.4 | ±0.8mm | 150# – 2500# |
| 4" | 100 | 157.2 | 123.8 | ±0.8mm | 150# – 2500# |
| 6" | 150 | 215.9 | 181.0 | ±1.0mm | 150# – 2500# |
| 8" | 200 | 269.9 | 231.8 | ±1.0mm | 150# – 2500# |
| 10" | 250 | 323.8 | 285.8 | ±1.0mm | 150# – 2500# |
| 12" | 300 | 381.0 | 339.9 | ±1.0mm | 150# – 2500# |
| 16" | 400 | 469.9 | 422.3 | ±1.5mm | 150# – 2500# |
| 20" | 500 | 584.2 | 533.4 | ±1.5mm | 150# – 2500# |
| 24" | 600 | 692.2 | 641.4 | ±1.5mm | 150# – 2500# |
| Size Code | Inner Diameter (mm) | Cross Section (mm) | Applications |
|---|---|---|---|
| AS568-010 | 1.78 | 1.78 | Instrumentation, small bores |
| AS568-110 | 9.25 | 1.78 | Hydraulic fittings, valves |
| AS568-210 | 17.78 | 1.78 | Standard hydraulic/pneumatic |
| AS568-222 | 22.22 | 3.53 | Medium pressure seals |
| AS568-325 | 40.04 | 3.53 | Pump and cylinder seals |
| AS568-341 | 52.07 | 3.53 | Large bore seals |
| AS568-432 | 95.25 | 5.33 | Heavy equipment, large flanges |
| AS568-536 | 145.60 | 5.33 | Large diameter vessel seals |
| ISO 3601 - 15 | 15.00 | 1.50 | Pneumatic low friction |
| ISO 3601 - 30 | 30.00 | 2.00 | Hydraulic medium duty |
| ISO 3601 - 50 | 50.00 | 3.00 | Hydraulic heavy duty |
| ISO 3601 - 100 | 100.00 | 4.00 | Large bore industrial |
| NPS (Inch) | Ring No. (Oval) | Ring No. (Oct) | Ring OD (mm) | Ring ID (mm) | Ring Height (mm) |
|---|---|---|---|---|---|
| ½" | R-11 | R-11 | 34.14 | 23.81 | 11.11 |
| ¾" | R-13 | R-13 | 42.88 | 31.75 | 11.11 |
| 1" | R-16 | R-16 | 50.80 | 38.10 | 11.11 |
| 1½" | R-20 | R-20 | 69.85 | 53.98 | 11.11 |
| 2" | R-23 | R-23 | 82.55 | 66.68 | 11.11 |
| 3" | R-27 | R-27 | 120.65 | 98.43 | 11.11 |
| 4" | R-31 | R-31 | 149.23 | 123.83 | 11.11 |
| 6" | R-35 | R-35 | 203.20 | 180.98 | 11.11 |
| 8" | R-39 | R-39 | 257.96 | 234.95 | 11.11 |
| 10" | R-44 | R-44 | 317.50 | 292.10 | 11.11 |
| 12" | R-47 | R-47 | 377.90 | 350.03 | 11.11 |
| 16" | R-53 | R-53 | 473.08 | 444.50 | 11.11 |
Choose the right material for your temperature, pressure and chemical compatibility requirements.
| Material | Temperature Range | Pressure | Chemical Resistance | Applications |
|---|---|---|---|---|
| NBR (Nitrile) | -30°C to +120°C | Medium | Oil, fuel, hydraulic fluid | Hydraulic systems, oil seals, fuel systems |
| FKM (Viton) | -20°C to +200°C | High | Excellent — chemicals, acids, fuels | Chemical processing, high-temp seals |
| EPDM | -50°C to +150°C | Medium | Steam, water, alkalis | Water systems, steam, cooling |
| Silicone | -60°C to +230°C | Low-Medium | Good — food grade available | Food, medical, high-temp low-pressure |
| PTFE (Virgin) | -200°C to +260°C | High | Outstanding — almost universal | Chemical, food, pharma, universal sealing |
| PTFE (Filled) | -200°C to +260°C | Very High | Outstanding + reduced creep | High-pressure, high-temp, dynamic sealing |
| Flexible Graphite | -200°C to +450°C | Very High | Excellent — steam, hydrocarbons | High-temp, high-pressure, steam service |
| Compressed Fiber | -40°C to +400°C | High | Good — oil, water, gas | General purpose, multi-media service |
| Ceramic Fiber | -200°C to +1260°C | High | Good — extreme temperature | Exhaust, turbo, extreme heat applications |
| Metallic SS 316 | -200°C to +800°C | Very High | Excellent — marine, chemical | Spiral wound metal insert, RTJ rings |
Refineries, offshore platforms, gas transmission — spiral wound gaskets, RTJ rings, graphite gaskets for high-pressure flange joints and valve connections.
Thermal, nuclear and combined cycle plants — high-temperature graphite gaskets, ceramic fiber seals, spiral wound gaskets for steam and boiler systems.
Process plants, reactors, heat exchangers — PTFE, FKM and graphite gaskets for aggressive chemical media and wide temperature ranges.
FDA/USDA-compliant PTFE and silicone gaskets, O-rings — for hygienic processing, clean-in-place (CIP) systems and sterile lines.
Hydraulic systems, pneumatic equipment, compressors, pumps — O-rings, seals and gaskets for equipment maintenance and assembly.
Water treatment, desalination, marine piping — EPDM and NBR gaskets, rubber O-rings for corrosion-free service in wet environments.
Certified manufacturing management system for consistent process control and traceability.
ASME B16.20/B16.21 compliance. API 6A gasket specifications for oil and gas service.
EN 10204 3.1/3.2 material certificates. FDA compliance for food-grade elastomers.
Temperature cycling and compression set testing for all gasket and O-ring materials.
Precision dimensional verification — thickness, diameter, tolerance per applicable standard.
100% visual inspection and positive material identification (PMI) on critical orders.
Spiral wound, RTJ, sheet, O-ring, PTFE, graphite, rubber, fiber gaskets.
NBR, FKM, EPDM, PTFE, graphite, ceramic fiber, SS 316, compressed fiber.
½" to 72" for gaskets, 5mm to 200mm for O-rings.
150# to 2500# flange ratings, RTJ for 600# to 2500#.
ASME B16.20, AS568, ISO 3601, DIN 3771, FDA 21 CFR.
100% inspection, material certificates with every shipment.
Die-cut and hand-cut gaskets to any flange size or shape.
Ready stock for common sizes and materials.
Direct from manufacturer and authorized distributor.
Expert guidance on material selection and compatibility.
Gaskets, O-rings, tapes, packing, insulation kits and packaging.
Our team can help with gasket selection, material compatibility, O-ring sizing and custom cutting requirements.