Creep Resistance Glass Bead Filled Modified PTFE Sealing Gasket for Industrial Use

Product Description

Product Description

PTFE gaskets, are made of polytetrafluoroethylene (PTFE). With its unique chemical and physical properties, they are widely used in many fields. The following is a detailed analysis of its uses and performance:

Main Applications

1. Chemical Industry
Sealing and Anti-corrosion: Used for sealing of pipelines, valves, and reactors, resistant to strong acids, strong alkalis, and organic solvents 
High Temperature Environment: Maintains performance at extreme temperatures of -200°C to +260°C, suitable for heat exchangers and high-temperature reaction equipment.
2. Food and Medicine Hygiene and Safety: Meets FDA standards, used for sealing of food processing equipment and pharmaceutical machinery to avoid contamination.
3. Electronic and Electrical High-Frequency Insulation: Used as sealing gaskets for cable insulation layers and high-frequency electronic components, with stable dielectric constants and reduced signal loss.
4. Mechanical Industry Low-Friction Seals: Used for dynamic sealing of hydraulic systems, compressors, etc. to reduce wear; Provides airtightness protection in vacuum equipment.

Core performance

1. Chemical corrosion resistance: Almost insoluble in all solvents (except molten alkali metals and high-temperature fluorine gas), resistant to aqua regia corrosion.
2. Wide temperature range adaptability Working temperature range: -200ºC to +260ºC, no brittleness at low temperature, no decomposition at high temperature.
3. Self-lubrication and non-stickiness: The friction coefficient is as low as 0.05-0.10, the surface is anti-sticky, easy to clean, and suitable for viscous medium sealing.
4. Excellent electrical insulation: The dielectric strength is as high as 20kV/mm, the dielectric loss is small, and it is suitable for high-frequency and high-voltage environments.
5. Flexibility and plasticity: It can be processed into special-shaped gaskets through molding, turning and other processes to adapt to complex sealing surfaces.

Limitations and precautions

1. Poor creep resistance: It is easy to deform under long-term high pressure, and needs to be checked regularly or used in combination with reinforcing materials (such as graphite and glass fiber).
2. Low mechanical strength: The tensile strength is about 20-35MPa, and it is not suitable to be used alone in high-pressure impact scenarios.
3. Poor thermal conductivity: The thermal conductivity coefficient is 0.25 W/(m·K), and it should be avoided in key heat dissipation parts.
4. Insufficient wear resistance: It may wear during high-load dynamic sealing, and fillers (such as carbon fiber) can be added to improve wear resistance.

PTFE gaskets are ideal sealing materials for chemical, food, electronics and other fields, especially in corrosion, high temperature and insulation scenarios. However, their mechanical performance limitations require users to select reinforced PTFE or composite gaskets according to specific working conditions (such as pressure, dynamic load) to ensure long-term reliability.

Parameter	Typical Value	Test Method / Remarks
Density (g/cm³)	2.15 – 2.25	ASTM D792, filler ratio approx. 20% by weight
Tensile Strength (MPa)	14 – 18	ASTM D638; slightly lower than virgin PTFE (20–25 MPa) but higher stiffness
Elongation at Break (%)	150 – 250	ASTM D638; virgin PTFE typically >300%, filler reduces ductility
Compressibility (%)	8 – 12	ASTM F36, at 34.5 MPa
Recovery (%)	≥ 45	ASTM F36
Hardness (Shore D)	60 – 70	ASTM D2240; virgin PTFE approx. 50–55
Continuous Service Temperature (°C)	-200 to +200	Short-term peaks up to 260°C acceptable
Maximum Working Pressure (MPa)	10 – 15	Based on 3 mm thickness, raised face flange; recommended bolt load applies

 

Our Service
1)Your inquiry will be replied within 2 hours during working time,Within 24hours when rest time.
2)Our working time is 7.30 AM --17:30 PM,Monday to Saturday.
3)General samples time can be arranged within 2--5days.
4)Orders will be produced exactly as request and approved samples.
5)When mass production,we send photos to show the production line.And confirm the estimate time again.
6)At the end of mass production,photos and samples will send to you for approval.You can arrange the inspection.
7)Before shipment,our QC will have inspection to make sure the quality.
8)We always try best to ensure every order to delivery in time.
 
Payment Terms
1)T/T,Cash,L/C.
2)30% deposit,70% balance before shipment.
3)Lead time: 15 days after received deposited for 2tons.
4)Delivery way: By sea,By air, By EMS,DHL,UPS,TNT,FedEx.
 
Packing & Delivery
For sample: By EMS,DHL,UPS,TNT,FedEx
                 around 5--7 working days to arrive
 
For Bulk order:
1.Qty of 2tons,within 15 days.
2.Via Sea
3.Delivery time:we will finish production in 15days for 2tons.
4.For 20 GP,may nee around 30days.

Product Application

Company Profile

Chunhuan Group (Zhenjiang Chunhuan Sealing Group Co., Ltd.), established in 1985, is a leading manufacturer of fluoroplastic products, chemical semiconductor linings, and new energy sealing gaskets. The company primarily focuses on the research, development, and production of fluoroplastic series sealing products (for hydrogen energy and nuclear power applications) and chemical semiconductor linings. With subsidiaries in South Korea and Shanghai, the group has also established a joint venture with South Korea's Houcheng Group for semiconductor lining equipment. Main  production: PTFE  products, metal  seals  series, steel  lining  anti-corrosion series, engineering plastics series,rubber products series,it is the leading enterprise in the national fluoroplastics industry. The  company  supplies  more  than  300  varieties  of  PTFE  composite modified  materials,ranging  from standard  composite modified  materials (bronze,glass fiber,carbon,graphite,etc.) to  customized  solutions  to  meet different  production  needs  of customers.The  company  provides  flexible  quantity  and  fast  delivery service. The engineers have 35 years working experience in the field of PTFE,serving customers in more than 30 countries.

Our Advantages

Certifications

Packaging & Shipping

FAQ

1. Q: What are the main advantages of glass bead filled reinforced PTFE gaskets over virgin PTFE gaskets?
A: The addition of glass microspheres significantly improves creep resistance and cold flow resistance, while enhancing wear resistance and dimensional stability. This allows the gasket to seal more durably under high pressure or cyclic loading conditions, reducing common compression deformation issues seen in virgin PTFE.

2. Q: What media environments are these gaskets suitable for?
A: They inherit PTFE's excellent chemical resistance and work well with most media, including strong acids, alkalis, organic solvents, and steam. However, they are not recommended for high-concentration acid or high-temperature strong alkali environments, as these may corrode the glass component.

3. Q: What is the standard filler ratio? Can the filling ratio be adjusted?
A: The standard ratio is typically 15%-25% by weight of glass microspheres - an optimized general-purpose reinforcement formulation. If your application requires a different ratio, we can adjust it upon request, though this may affect certain physical properties. Please discuss your needs with us beforehand.

4. Q: What is the maximum custom size available? Is there a minimum thickness limitation?
A: We can custom-make gaskets up to 2000 mm in outer diameter and as thin as 1.5 mm. Final dimensions depend on the shape (circular, non-standard, etc.). Please provide your drawing or size requirements, and we will evaluate the feasible range.

5. Q: Can this gasket be used in food or pharmaceutical applications?
A: The glass bead filled PTFE material is non-toxic and odorless, and it complies with FDA requirements for PTFE composites intended for food contact. Final applicability depends on your local regulations. We can provide a declaration of conformity upon request.

6. Q: How does the pressure rating compare to unfilled PTFE?
A: The glass microspheres increase stiffness and compressive strength, so the recommended maximum allowable sealing pressure is typically 20%-30% higher than that of virgin PTFE. Please refer to our technical datasheet for exact values, or we can help calculate based on your flange type and bolt load.

7. Q: Do glass microspheres detach from the gasket surface and contaminate the system?
A: No. The glass microspheres are tightly encapsulated by the PTFE matrix. The surface is smooth and dense after molding or skiving, so particle detachment does not occur under normal use. Therefore, this gasket is suitable for clean systems such as hydraulic circuits or precision instruments.

8. Q: Does the filler affect PTFE's thermal stability during long-term high-temperature exposure?
A: Glass microspheres themselves have excellent heat resistance (>800°C) and do not lower PTFE's decomposition temperature. However, the continuous service temperature of the composite is still recommended not to exceed 200°C, as the PTFE matrix gradually softens above this point. Short-term peaks up to 260°C are acceptable.