ASME B16.21 Gaskets are high-quality, non-metallic flat gaskets designed for use with ASME B16.5 and ASME B16.47 flanged joints. Manufactured from a wide range of elastomers, compressed non-asbestos fibers, PTFE, and graphite sheets, these gaskets provide excellent sealing performance for low-to-moderate pressure and temperature applications. Shanxi Xinshunda Flange Manufacturing Co., Ltd. utilizes precision CNC cutting technology to ensure exact dimensional accuracy and superior surface finishes. Full compliance with ASME B16.21 dimensional standards is guaranteed, with comprehensive material traceability and test reports provided upon request.
Production Details
Our ASTM A193 bolts are produced using state-of-the-art CNC machinery to ensure every thread and hexagonal head meets precise engineering drawings. The raw materials undergo strict chemical composition analysis before entering the production line. Each fastener is subjected to rigorous surface inspection to ensure the absence of defects such as cracks, laps, or improper coating. The dimensional accuracy is verified using advanced measuring instruments, ensuring a perfect match with your mating flanges.
Product Properties and Application
Product Properties
Excellent Chemical Resistance: Depending on the material chosen (e.g., PTFE or specialized rubber), these gaskets offer superior resistance to a wide range of chemicals, acids, and alkalis.
Superior Compressibility: The soft, non-metallic structure ensures the gasket conforms perfectly to flange imperfections, creating a tight, leak-proof seal.
Cost-Effective Sealing: Provides a highly economical yet reliable sealing solution for standard low-pressure piping systems.
Versatile Material Options: A broad selection of elastomers and composite sheets allows for customization based on specific temperature, pressure, and media requirements.
Application
ASME B16.21 Gaskets are extensively used in general industrial applications, including Water Treatment Plants, HVAC Systems, Food and Beverage Processing, and Light Chemical Industries. They are also commonly found in Low-Pressure Piping, Pump and Valve Sealing, and General Utility Services where extreme pressures and temperatures are not a factor.
|
Parameter |
Specification |
|
Standard |
ASME B16.21, ASME B16.5, DIN 2690, DIN 28091 |
|
Product Type |
Full Face Gasket (FF), Inside Bolt Circle Gasket (RF) |
|
Material |
Rubber (EPDM, NBR, Viton), PTFE, Graphite, Non-Asbestos Fiber (NAF) |
|
Size Range |
1/2" to 24" (Metric DN15 to DN600) |
|
Pressure Rating |
Class 150 to Class 300 (PN 10 to PN 40) |
|
Thickness |
1/16" (1.5mm), 1/8" (3.0mm), or Customized |
|
Color / Appearance |
Black, Green, White, or as per material specification |
|
Operating Temperature |
-200°C to +550°C (depending on selected material) |
|
Packing |
Plywood Cases, Wooden Pallets, or Custom Export Packaging |
Physical Properties
|
Property |
Value |
|
Tensile Strength |
5 MPa - 15 MPa (depending on material, e.g., NAF) |
|
Compressibility |
10% - 40% (ASTM F36) |
|
Recovery |
40% - 60% (ASTM F36) |
|
Density |
1.5 g/cm³ - 2.2 g/cm³ (varies by material) |
|
Leakage Rate |
≤ 1 x 10⁻³ cm³/s (Helium Mass Spectrometer) |
|
Hardness (Rubber) |
60 ± 5 Shore A |
QA & QC
At Shanxi Xinshunda, we implement a rigorous Quality Control system for our ASME B16.21 gaskets. Every gasket undergoes precise dimensional checks using calibrated gauges to ensure compliance with ASME standards. We verify the material composition through certified supplier test reports and in-house spectroscopic analysis where applicable. Compressibility, recovery, and sealing performance tests are conducted regularly. Mill Test Certificates (EN 10204 3.1) are provided with every shipment.
Packing, Storage, Handling and Transportation
To prevent deformation and surface contamination, each gasket is carefully cleaned and individually wrapped in plastic film or placed in custom-fit cardboard boxes. Multiple units are then securely packed in sturdy plywood cases or on wooden pallets with ample cushioning to prevent movement during transit. Each package is clearly labeled with the size, standard, material code, and batch number. Store in a cool, dry, and dark environment; avoid exposing rubber gaskets to direct sunlight or ozone to prevent premature aging.
Strategic Partners with Shanxi Xinshunda
With over 15 years of manufacturing expertise, Shanxi Xinshunda Flange Manufacturing Co., Ltd. has proudly supplied premium industrial flanges and sealing solutions to 3,800+ global customers across 70+ countries. We are committed to ensuring your critical piping systems operate safely and efficiently, making us your trusted partner in the global energy and processing industries.
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