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Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High

China Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High

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Kevlar Packing Coated with PTFE The Ultimate Sealing Material for High

MOQ： 20kgs
Price： USD15.00 per kg
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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
Brand Name	3A Rubber
Model Number	3A3005
Certification	ISO9001
Place of Origin	China

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Product Details
Company Details

Product Specification


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
Brand Name	3A Rubber	Model Number	3A3005
Certification	ISO9001	Place of Origin	China
High Light	Kevlar PTFE packing seal ，PTFE coated industrial packing ，high-performance Kevlar sealing material

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:

Clean the Stuffing Box: Remove all old packing remnants and clean the shaft/sleeve.
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.
Install Rings: Carefully install each ring, using a tamping tool to seat each one firmly. Avoid twisting or distorting the rings.
Adjust the Gland: After installation, hand-tighten the gland nuts.
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.
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 in industrial application

Company Details

Bronze Gleitlager

Bronze Sleeve Bushings

and

Graphite Plugged Bushings

from Quality China Factory

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Business Type:

Distributor/Wholesaler,Agent,Importer,Exporter,Trading Company,Seller 
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Year Established:

2007 
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Total Annual:

2000000-5000000
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Employee Number:

800~1000 
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Ecer Certification：

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We are a professional supplier and exporter of high quality rubber and plastic products with reasonable price in China. We can help you supply all kinds of rubber and plastic products with professional products and services under reasonable & competitive price. We are designing, producing and ex... We are a professional supplier and exporter of high quality rubber and plastic products with reasonable price in China. We can help you supply all kinds of rubber and plastic products with professional products and services under reasonable & competitive price. We are designing, producing and ex...

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https://www.industrialrubbersheets.com/

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