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Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Specifications
Brand Name :
3A Rubber
Model Number :
3A3005
Certification :
ISO9001
Place of Origin :
China
MOQ :
20kgs
Price :
USD15.00 per kg
Payment Terms :
L/C,D/A,D/P,T/T,Western Union,
Supply Ability :
100000kgs/month
Delivery Time :
7-15days after receive the buyer's payment
Packaging Details :
packing in rolls, cartons and pallets
Pressure :
0~4mpa
Chemical Resistance :
Excellent
Tensile Strength :
25 MPa
Surface :
smooth
Width :
3-100mm
Chemical :
Resistance
Structure :
lattice braid
Packing :
Carton , Wooden Box
Press :
3-30Mpa
Resilience :
Good
Working Press :
2-20Mpa
Produced :
CNC machining
Shape :
Packing
Dielectric :
Constant
Description
Kevlar Packing Coated with PTFE - The Ultimate Sealing Material for High-Performance Applications in Industrial Equipment
Attribute Value
Pressure 0~4mpa
Chemical Resistance Excellent
Tensile Strength 25 MPa
Surface smooth
Width 3-100mm
Chemical Resistance
Structure lattice braid
Packing Carton, Wooden Box
Press 3-30Mpa
Resilience Good
Working Press 2-20Mpa
Produced CNC machining
Shape Packing
Dielectric Constant
Yellow Pure Kevlar Packing, Kevlar Braided Packing, Kevlar Packing Coated PTFE
Kevlar packing is a type of mechanical sealing material used to prevent leakage in pumps, valves, and other industrial equipment with rotating or reciprocating shafts. It is made from braided fibers of Kevlar® (an aramid fiber developed by DuPont), which is renowned for its exceptional strength, thermal stability, and resistance to abrasion. Unlike traditional packings like flax or graphite, Kevlar packing is a high-performance synthetic material designed to handle more demanding conditions.
Key Advantages and Properties
Kevlar packing offers a unique set of properties that make it superior to many traditional materials:
  • Exceptional Strength and Toughness: Kevlar has a very high tensile strength (about 5 times stronger than steel on an equal-weight basis). This makes the packing highly resistant to extrusion, blowout, and wear, leading to a longer service life.
  • Excellent Thermal Stability: It can operate continuously at temperatures up to 550°F (288°C) and can handle short-term spikes up to 800°F (427°C). This makes it suitable for hot water, steam, and other high-temperature fluids.
  • High Chemical Resistance: It is resistant to a wide range of chemicals, including most solvents, oils, and acids (though it is not recommended for strong acids and strong alkalis).
  • Low Coefficient of Friction: Kevlar fibers are inherently lubricious. This reduces friction and wear on the equipment's shaft or sleeve, which lowers power consumption and prevents damage to expensive components.
  • Non-Abrasiveness: Unlike some reinforced materials, it is gentle on shafts and won't score or wear them down prematurely.
  • Non-Asbestos & Environmentally Friendly: Kevlar packing was developed as a direct, superior replacement for hazardous asbestos-based packing.
Common Applications
Kevlar packing is versatile and used across numerous industries for sealing:
  • Centrifugal and Rotary Pumps: Handling hot water, chemicals, slurries, and hydrocarbons.
  • Valves: Especially in steam valves, gate valves, and control valves.
  • Mixers and Agitators: Where abrasion resistance and strength are critical.
  • Expansion Joints: For its flexibility and thermal properties.
  • Industrial Equipment: In paper mills, chemical processing plants, power generation facilities, and marine applications.
Common Media Sealed: Hot water, steam, chemicals, acids, alkalis, oils, fuels, solvents, air, dyes, and many other aggressive fluids.
Types and Construction
Kevlar packing is rarely made from 100% Kevlar fibers. It is typically braided and combined with other materials to enhance its properties:
  • Pure Kevlar Braid: Braided from 100% Kevlar yarn, often impregnated with a lubricant like PTFE (Teflon) or a proprietary grease. Excellent for general high-temperature service.
  • Kevlar/PTFE Blend: Combines the strength of Kevlar with the incredible chemical resistance and low friction of PTFE. This is an extremely popular combination for a wide range of chemical services.
  • Kevlar/Graphite Blend: Incorporates graphite for superior lubricity and higher temperature performance, ideal for demanding steam applications.
  • Kevlar/Carbon Blend: Offers enhanced thermal conductivity and additional lubricity.
The packing can be square braided, braided over a core (jacketed), or interbraided with other materials.
Installation and Break-in Procedure
Proper installation is crucial for performance and longevity:
  1. Clean the Stuffing Box: Remove all old packing remnants and clean the shaft/sleeve.
  2. Measure and Cut: Precisely measure the shaft diameter and stuffing box bore to cut new rings. Always cut rings at a 45-degree angle (skive cut) and stagger the joints around the shaft.
  3. Install Rings: Carefully install each ring, using a tamping tool to seat each one firmly. Avoid twisting or distorting the rings.
  4. Adjust the Gland: After installation, hand-tighten the gland nuts.
  5. Break-in Period: This is critical. Start the equipment and gradually tighten the gland follower in small increments (e.g., 1/6 of a turn) every 10-20 minutes. The goal is to allow a few drops of leakage to cool and lubricate the packing. Never overtighten to stop all leakage immediately, as this will cause rapid, destructive overheating.
  6. Final Adjustment: Once the packing has settled and run-in (which can take several hours), adjust the gland so there is a minimal, controlled weep of fluid.
Limitations and Considerations
  • Not for Strong Acids/Bases: While chemically resistant, prolonged exposure to strong mineral acids (e.g., sulfuric, nitric) and strong caustics (e.g., sodium hydroxide) can degrade the fibers.
  • UV Degradation: Kevlar can degrade under prolonged exposure to ultraviolet light, but this is rarely an issue in an enclosed stuffing box.
  • Cost: It is more expensive than traditional materials like graphite or flax, but its longer life and reduced downtime often result in a lower total cost of ownership.
Comparison Table: Kevlar vs. Other Common Packings
Property Kevlar Packing Graphite Foil PTFE (Teflon) Cotton/Flax
Max Temp 550°F (288°C) 1000°F+ (538°C+) 500°F (260°C) 250°F (121°C)
Strength Excellent Poor Good Fair
Abrasion Resistance Excellent Fair Good Fair
Chemical Resistance Very Good Excellent Excellent Poor
Shaft Wear Low Can be high Very Low Moderate
Primary Use Tough, abrasive, hot services High-temp steam/air Broad chemical service Cold water, oils
Summary
Kevlar packing is a high-performance, durable sealing solution ideal for applications that combine high pressure, high temperature, and abrasive media. Its unique blend of strength, thermal stability, and chemical resistance makes it a go-to choice for upgrading from traditional packings and solving difficult sealing challenges in demanding industrial environments. Always consult the manufacturer's specifications for your specific fluid, temperature, and pressure conditions.
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
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Product Detail
Brand Name :
3A Rubber
Model Number :
3A3005
Certification :
ISO9001
Place of Origin :
China
MOQ :
20kgs
Price :
USD15.00 per kg
Contact Supplier
video
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen
Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High-Performance Applications in Industrial Equipmen

SANHE 3A RUBBER & PLASTIC CO., LTD.

Verified Supplier
12 Years
hebei
Since 2007
Business Type :
Distributor/Wholesaler, Agent, Importer, Exporter, Trading Company, Seller
Main Products :
Industrial Rubber Sheet, Silicone Rubber Sheet, High Temperature Rubber Sheet
Total Annual :
2000000-5000000
Employee Number :
800~1000
Certification Level :
Verified Supplier
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