Chime Polymers Private Limited

Temperature extremes, high friction, and heavy loads?  Vespel® has outperformed other engineering materials under the most severe conditions since 1965. 

For highly demanding applications  like aerospace components, semiconductor processing, automotive manufacturing, and energy production rely on Vespel® parts to keep their equipment running.

Outstanding temperature, mechanical and PV properties.Vespel® polyimide parts and shapes provide continuous operation at cryogenic to high temperatures; low wear and low friction at high PV in lubricated or unlubricated environments; outstanding creep, strength, and impact resistance; exceptional dimensional stability; low thermal expansion; and easy machinability.

Vespel® makes lighter weight parts not only practical, but, in many cases, better than standard metal, ceramics, and other engineering polymers such as PEEK (polyether ether ketone) and PAI (polyamide-imide).

Global solutions. With design centers in Asia, Europe, and the Americas, Dupont Engineers and Scientists collaborate with customers to combine materials science with design to produce high-performance parts and keep production running smoothly.

Wide range. Vespel® parts and shapes, both custom and stock, have been tested and proven effective in highly demanding applications around the globe. They are available in sheet, rod, tube, plaque, bar, disk, ring, ball, direct formed and custom machined parts.

Uses

• Bearings, bushings, insulators, seals, thrust washers, and wear rings
• Wear pads, wear strips, and tube clamps
• Thermoplastic injection-molded, assembled, and composite parts
• Test sockets and wafer guides
• Glass handling technology
• Wear components in centrifugal pumps
• Hydrocarbon, chemical, and water service pumps

Advantages

• Low creep and low out-gassing
• Lightweight yet handles high loads
• Chemical, electrical, wear, and thermal resistance
• Strength, stiffness, and dimensional stability
• Easy to machine and can be machined to very close tolerances
• Works well under hard vacuum, radiation, oxygen compatibility, cryogenic conditions, and exposure to flame
• Costs less to manufacture than ceramic

Additional Information:

• Delivery Time: DEPENDS UPON THE REQUIREMENTS.

Vespel® parts and shapes – Ball valve seats and seals

Valve seats and seals made from diverse polymers and composite material systems are used to achieve bubble-tight closure in high chemical hazard and extreme temperature processes. Typically for valves that need to seal at high temperatures and high pressures, metal seated valves are used consisting of a tungsten carbide (to 260 °C) or chromium carbide (> 260 °C) coating on the ball and seats. Because the compressive modulus of metals is very high (> 500GPa), it is much harder to make an effective seal and make the valve “bubble tight.” Due to creep, many polymers become difficult to use much above their glass transition temperature at higher pressure classes.

• Low coefficient of friction
• Wide range of temperature capabilities from cryogenic, –320 °F (–196 °C), to 550°F (288 °C), with excursions up to 900 °F (482 °C)
• Low coefficient of thermal expansion
• Broad chemical compatibility

Features
• Good wear resistance
• High creep resistance
• High toughness and impact resistance
• Easy to machine to tighter tolerances
• High pressure capability up to 3000 psi (20.7 MPa)
• Wide operational temperature range, from -269ºC (-452 ºF) up to more than 300ºC (572 ºF), with short excursions up to 480 ºC (896 ºF).

Vespel Parts in Aerospace

• Reduced Weight
• Increased Part Wear Life
• Higher Operating Temps
• Broad Chemical Resistance
• Lower Friction Ability to Run Unlubricated
• Low Outgassing
• Broad Temperature Range Stability
• Cryogenic Performance

DuPont™ Vespel® Space Applications

Satellite and Spacecraft

• Camera lens retainers & centering rings
• Seals
• Locking fasteners
• Bearings
• Bushings

Key Advantages

Superior resistance to heat and wear. Capability of direct contact with aluminum components

Vespel® thrust washers have demonstrated many years of superb reliability in transmission applications due to:

• The lack of melting point means the washer will not melt
• A high limiting PV value (an indicator of resistance to wear) which is superior to other engineering resins
• Low-wear rates when used directly against lubricated aluminum components, even in the presence of contamination or foreign matter in the oil
• Custom-designed oil grooves on the washer surface allow precise control of oil flow, further enhancing resistance to wear
• The ability to easily form an oil film on its surface which creates a very low coefficient of friction

 

Additional Information:

• Delivery Time: DEPENDS UPON THE REQUIREMENT

Vespel® components have a higher durability and better reliability than comparable materials. Automakers choose Vespel® driveline components because they:

• Lower the risk of seizure
• Do not melt
• Show low wear even under demanding PV limits 
• Maintain outstanding dimensional stability at high temperatures 
• Allow for downsizing and weight reduction
• Resist typical transmission lubricants and greases
• Perform with ultra-low viscosity lubricants
• Provide torque loss reduction due to excellent friction performance

In driveline applications, Vespel® parts—such as seal rings, thrust washers, bushings, and fork pads—excel in:

• Automatic, CVT (continuously variable), and dual clutch transmissions
• Transfer cases
• Torque converters
• Other driveline components

Long life and cost-effective solutions

In heavy-duty off-road transmissions and hydraulic motors, Vespel® seal rings and thrust washers deliver long life and cost-effective solutions to meet short lead time demands and production volume requirements.

Additional Information:

• Delivery Time: DEPENDS UPON THE REQUIREMENTS

Vespel®SP Bushing has been adopted EGR Valve for New Diesel Engine

EGR（＝Exhaust Gas Recirculation） is the functional part for emission regulations and Vespel®SP Bushing is used at linked bar for EGR

Material Chosen, and Why
Excellent Heat resistance, Wear Performance and Self-lubricating

Vespel®SP Bushing is satisfied under the strict conditions below EGR Valve EGR Cooler Inter cooler Exhaust manifold Exhaust Inlet manifold Inlet Turbocharger
・ High Heat resistance
・ Self-lubricating characteristic
・ High Wear performance 

Vespel®SP Bushing has self-lubricating characteristic and doesn’t have glass transition point (Tg). That’s why it doesn’t melt in the high temperature condition of Exhaust Gas close to Engine. It can work without lubricant even in the impossible condition for conventional metal Bushing. And then, the high wear performance can bring and keep the precise control of EGR under strict condition mentioned above in the long run.

DuPont™ Vespel® Wear and friction parts In textile machinery

Vespel® polyimide parts are used in wear and friction applications in textile processing equipment, allowing for lubricant free running machines. The high wear resistance of the parts ensures higher productivity and speed of operation. The excellent thermal and chemical resistance have also resulted in successful application of Vespel® parts in downstream equipment.

Vespel® tube is manufactured from a high performance polyimide resin, combining the best characteristics typically found in plastic, metals and ceramics. Our Vespel® tube is highly resistant to wear, creep and has an extremely high operating temperature. This material has limited resistance to acids, alkalis and steam. 

Applications

Machined components, hinges and bearings.

Key Features

• Temperature: Up to +288°C continuous (+482°C short term).
• High strength and impact resistance.
• Withstands loads at high temperatures.
• Outstanding wear and creep resistance. 
• Easily machinable.

Additional Information:

• Delivery Time: DEPENDS UPON THE REQUIREMENTS

Description
Insulators, seals, bushings and bearings for plastic injection molding and extrusion equipment

Attributes
• Low coefficient of friction
• Wide range of temperature capabilities up to 550°F/288°C and above
• High mechanical strength
• No glass transition temperature (Tg)

Features
• Resists wear better than unlubricated metals
• Degradation resistance at high temperature
• Creep resistance thus maintaining its dimensions under the toughest conditions
• Excellent insulator
• Excellent impact strength and toughness
• Does not melt
• Easy to machine to near metal-like tolerances and an excellent sealant

Benefits
• Reduced overall maintenance cost
• Less contamination due to self lubrication
• Improved molded product
• Improved performance and reliability of injection molding operation
• Allows for faster color/material change times due to the prevention of molten plastic from being sucked up into the drop

Additional Information:

• Delivery Time: DEPENDS UPON THE REQUIREMENTS

Vespel® sheet is a collection of highly durable polyimides combining the best characteristics typically found in plastics, metals and ceramics. They are highly resistant to wear, creep and have extremely high operating temperatures.

Key Features

• Temperature: Up to +288°C continuous (+482°C short term).
• Outstanding wear resistance and easily machinable.
• Low thermal and electrical conductivity.
• Withstands loads at high temperatures.

Additional Information:

• Delivery Time: DEPENDS ON THE REQUIREMENTS

VESPEL® GradesVespel® SP

Vespel® SP-1 - Unfilled Base Resin (Highly Pure) provides Maximum Strength and Elongation, Lowest Modulus and Thermal Conductivity. Optimum electrical properties.

Applications : Hot runner Insulators, High Temp soft valve seats, Parts used in Semiconductor manufacturing process.

Vespel® SP-21 – 15% Graphite (By weight) Enhances Inherent Wear Resistance. Long thermal Stability

Applications : Soft Valve Seats (High Temp and Cryogenic), Bushes, Washers, Sealrings, Thrust Washers, Wear Strips etc.

Vespel® SP-22 – 40% Graphite (By Weight) Has Low co-efficient of Thermal Expansion - Maximum Creep resistance.

Applications : Bushings and Bearings.

Vespel® SP-211 – 15% Graphite and 10% PTFE (fluorocarbon) By Weight. Lowest Static Friction. Low Wear and Friction in moderate temperature and PV environments.

Applications : Bushings and Bearings.

Vespel® SP-3 – 15% Molybdenum disulfide (MoS2 - By Weight). Best Wear performance in Vacuum/Inert gas /Dry conditions.

Applications : Bearings, Piston rings, Fasteners and Seals.

Vespel® SP-221 – 40% Graphite and 10% PTFE Fluorocarbon resin (By Weight) Lowest Wear rate in Dry service against Soft metals.

Applications : For Low Wear applications in non-lube conditions against Soft Metals like Aluminium, Brass and Bronze. Bushings and Bearings.