Modified PTFE Gasket Sheet with Aluminosilicate Glass Microspheres
Model:KXT 500
Modified PTFE Gasket Sheet with Aluminosilicate Glass Microspheres is a PTFE gasket material with aluminosilicate microspheres. It offers much improved performance over standard PTFE and helps reduce product loss and emissions. Modified PTFE Gasket Sheet with Aluminosilicate Glass Microspheres Blue Style KXT 500 helps minimise cold flow problems typical of expanded PTFE and also has excellent bolt torque retention. As with standard PTFE and other materials, it withstands a wide range of chemicals. This material also conforms to FDA regulations and can be cut to meet your specific requirements utilising our in-house CNC machining technology.
Modified PTFE Gasket Sheet with Aluminosilicate Glass Microspheres – KXT 500
Kaxite Sealing, a trusted China modified PTFE gasket sheet manufacturer, introduces the KXT 500 Modified PTFE Gasket Sheet – a premium sealing material reinforced with aluminosilicate glass microspheres. This advanced PTFE compound delivers significantly improved performance over conventional PTFE, offering superior creep resistance, enhanced bolt torque retention, and reduced cold flow – the common failure mode of expanded PTFE. The incorporation of hollow glass microspheres provides excellent dimensional stability while maintaining the outstanding chemical resistance and low friction characteristics of pure PTFE.
Why Kaxite KXT 500 stands out? The unique blue-coloured material is engineered to minimize product loss and fugitive emissions, making it ideal for flange sealing in chemical, pharmaceutical, food processing, and electronics industries. It withstands a wide range of aggressive media – including moderate acids, hydrocarbons, solvents, water, refrigerants, cryogenic fluids, and some caustics – while complying with FDA regulations for food-contact applications. Our in-house CNC die-cutting and waterjet cutting capabilities allow us to produce custom gaskets in any size or shape, from standard ANSI flanges to complex non-circular configurations.
As a leading PTFE sheet supplier in China, Kaxite Sealing offers KXT 500 in thicknesses from 0.5 mm to 6.0 mm, in standard sheet sizes of 1500×1500 mm or 3000×1500 mm, as well as custom cut gaskets. Whether you need bulk wholesale sheets for large-scale maintenance or precision-cut gaskets for critical process equipment, we deliver consistent quality with full material traceability. Request a free sample or get a bulk quote today.
Max. Temperature260°C
Low Temp. Resistance-268°C
Density1.9 g/cm³
Compressibility≥ 30%
Recovery≥ 30%
Creep Relaxation≤ 40%
Why KXT 500 Modified PTFE Gasket Sheet?
- ✅ Superior Creep Resistance – Glass microspheres reduce cold flow by up to 40% vs. standard PTFE
- ✅ Extreme Temperature Range – -268°C to +260°C, suitable for cryogenic to high-heat
- ✅ FDA Compliant – 21 CFR 177.1550 for food, pharmaceutical, and potable water
- ✅ Custom CNC & Waterjet Cutting – Any shape, any standard, no subcontracting
- ✅ Excellent Torque Retention – Minimizes re-torquing and prevents flange leakage
- ✅ Free Sample Available – 100×100 mm sheets for qualification testing
ISO 9001:2015 FDA 21 CFR 177.1550 REACH & RoHS Compliant 40+ Countries Supplied 2-Hour Quote Response
Key Advantages of KXT 500 Modified PTFE Gasket Sheet
Superior Creep Resistance – The aluminosilicate glass microspheres act as a rigid filler, significantly reducing cold flow and creep relaxation – the primary drawback of standard and expanded PTFE.
Excellent Torque Retention – Maintains gasket stress over time, minimizing the need for re-torquing and ensuring leak-free performance under thermal and pressure cycling.
Reduced Emissions & Product Loss – The tight sealing characteristics help meet fugitive emission regulations (VOC, EPA) and reduce costly media loss in critical processes.
Wide Chemical Compatibility – Resists moderate acids, hydrocarbons, solvents, water, refrigerants, cryogenic fluids, and many caustics – suitable for pH 0-14 (except strong oxidizers).
FDA Compliant – Meets FDA 21 CFR 177.1550 requirements, making it safe for food processing, pharmaceutical, and potable water applications.
Custom CNC Machining – Our in-house CNC cutting and waterjet technology allows us to supply gaskets in any shape – round, oval, rectangular, or complex – with precision and short lead times.
Material Composition & Available Formats
Base Material
- PTFE resin – high purity, virgin grade
- Filler: aluminosilicate glass microspheres (hollow)
- Colour: Blue (for easy identification)
- Density: 1.9 g/cm³ (ASTM D792)
Available Formats
- Sheets: 1500×1500 mm or 3000×1500 mm
- Thickness: 0.5 – 6.0 mm (custom on request)
- Die-cut gaskets – any shape (ANSI, DIN, JIS, custom)
- Waterjet cut for complex profiles and large diameters
Additional options: Roll form, slit tape, and adhesive-backed gaskets available for volume orders. Contact us for specific requirements.
Technical Specifications (Typical Values)
| Property | Value / Range | Test Standard |
|---|---|---|
| Colour | Blue | Visual |
| Density | 1.9 g/cm³ | ASTM D792 |
| Compressibility | ≥ 30 % | ASTM F36 A |
| Recovery | ≥ 30 % | ASTM F36 A |
| Tensile Strength | ≥ 14 MPa | ASTM D152 |
| Creep Relaxation (100°C, 24h) | ≤ 40 % | ASTM F38 |
| Sealability (DIN 3535) | ≤ 0.015 mg/s·m | DIN 3535 |
| Temperature Range (Continuous) | -268°C to +260°C | Internal |
| pH Range | 0 – 14 (except strong oxidizers) | — |
| FDA Compliance | 21 CFR 177.1550 | — |
* Values are typical for 2.0 mm thickness. Different thicknesses may exhibit slight variations. Request full data sheet
KXT 500 vs Standard PTFE vs Expanded PTFE – Performance Comparison
| Property | KXT 500 (Modified PTFE) | Standard Pure PTFE | Expanded PTFE (ePTFE) |
|---|---|---|---|
| Creep Relaxation | ≤ 40% | ≥ 60% | ≥ 55% |
| Torque Retention | Excellent | Poor | Moderate |
| Density (g/cm³) | 1.9 | 2.2 | 0.8 – 1.2 |
| Max. Continuous Temp. | 260°C | 260°C | 260°C |
| FDA Compliance | Yes | Yes | Yes |
| Blowout / Extrusion Resistance | High | Low | Very Low |
| Handling Strength | Excellent | Good | Fragile |
| Recommended Applications | Demanding Flange Sealing | General Purpose | Low Pressure / Conforming |
* KXT 500's glass microsphere reinforcement provides superior creep resistance and torque retention – critical for reducing re-torquing and preventing fugitive emissions in chemical and pharmaceutical plants.
Typical Applications & Industries
Chemical Processing Flange gaskets for reactors, storage tanks, and piping systems handling moderate acids, solvents, and aggressive chemicals.
Also explore our standard PTFE sheet for less demanding services.
Pharmaceutical & Biotechnology FDA-compliant gaskets for fermenters, mixers, and clean-in-place (CIP) systems – non-contaminating and easy to clean.
Food & Beverage Gaskets for pasteurizers, homogenizers, and filling lines – meets FDA regulations for food contact.
Electronics & Semiconductor Sealing for chemical delivery systems, wet benches, and ultra-pure water lines – low extractables and high purity.
Cryogenic & Refrigeration Gaskets for liquefied gas lines, cold boxes, and refrigeration equipment – excellent low-temperature performance.
General Industrial Maintenance Replacement gaskets for flanges, manholes, and heat exchangers in a wide range of process industries.
Why Choose Kaxite for Modified PTFE Gasket Sheets?
Decades of PTFE Compounding Expertise – Since 1990, Kaxite has specialized in high-performance sealing materials. Our proprietary aluminosilicate glass microsphere dispersion technology ensures uniform filler distribution, delivering consistent batch-to-batch quality that engineers can rely on.
ISO 9001:2015 & FDA Certified Facility – Our Ningbo factory operates under strict quality management systems. Every KXT 500 sheet is produced in a controlled environment with full material traceability, and we provide Certificates of Compliance for FDA 21 CFR 177.1550 upon request.
In-House CNC & Waterjet Cutting – No Subcontracting – Unlike many suppliers who outsource cutting, we handle everything in-house. This allows us to offer rapid prototyping, shorter lead times, and strict quality control over edge finish and dimensional accuracy – critical for high-integrity flange sealing.
Competitive Factory-Direct Pricing – As a true China PTFE sheet manufacturer, we eliminate middleman markups. Our vertically integrated production – from compounding to moulding to cutting – delivers wholesale pricing without compromising on quality, backed by fast global shipping.
2-Hour Rapid Quote & Technical Support – Our technical sales engineers understand the complexities of chemical and pharmaceutical sealing. We respond to inquiries within 2 business hours, offering material selection advice, torque recommendations, and flange compatibility checks – ensuring you get the right gasket the first time.
Global Supply Chain & Logistics Expertise – We ship to over 40 countries with reliable freight partners. Whether you need just-in-time delivery for a plant turnaround or consolidated bulk orders for global inventory, our logistics team ensures your gaskets arrive on time, with full customs documentation.
Proven Track Record: Kaxite Sealing has supplied modified PTFE gasket sheets to Tier-1 chemical corporations, pharmaceutical giants, and food processing leaders. Our KXT 500 is specified in critical applications where leakage prevention, FDA compliance, and long service life are non-negotiable.
Quality Assurance & Regulatory Compliance
Kaxite Sealing operates an ISO 9001:2015 certified manufacturing facility in Ningbo, China. Our KXT 500 Modified PTFE Gasket Sheets are produced under stringent process controls – from raw material selection and mixing to compression moulding, skiving, and final inspection. Each production lot is tested for density, compressibility, recovery, and creep relaxation to ensure consistent performance in critical applications. We provide material test certificates with every shipment, ensuring full traceability from resin to finished gasket.
- ISO 9001:2015 Certified
- FDA 21 CFR 177.1550
- REACH & RoHS Compliant
- Full Material Traceability
- Tested to ASTM Standards
Trusted by engineers worldwide – our modified PTFE gasket sheets are used in over 40 countries, backed by responsive technical support and fast global delivery from our China factory.
Custom Gasket Cutting & OEM Services – Free Sample Available
As a professional modified PTFE gasket sheet manufacturer in China, we offer complete customisation to meet your exact application requirements. Request a free sample or get a bulk quote today:
- Custom sheet sizes and thicknesses
- Die-cut gaskets (any shape, any standard)
- Waterjet cutting for complex profiles
- Adhesive backing on request
- Bulk wholesale pricing for volume orders
- Just-in-time delivery and inventory management
Get a free sample or request a tailored bulk quote – our team responds within 24 hours with competitive China factory pricing and lead-time estimates.
Frequently Asked Questions About Modified PTFE Gasket Sheets
- Q: What are aluminosilicate glass microspheres and why are they used?
- A: Aluminosilicate glass microspheres are hollow, rigid spheres that act as a reinforcing filler in PTFE. They significantly improve creep resistance and dimensional stability while reducing cold flow – the main limitation of pure PTFE. This allows the gasket to maintain a tight seal over time with less re-torquing.
- Q: What is the maximum operating temperature?
- A: KXT 500 operates continuously from -268°C to +260°C, making it suitable for both cryogenic and high-temperature applications. Short-term excursions above 260°C may be possible, but we recommend consulting our technical team for your specific process conditions.
- Q: Is this material FDA compliant?
- A: Yes. KXT 500 meets FDA 21 CFR 177.1550 requirements, making it safe for direct food contact and pharmaceutical processing. We can provide a Certificate of Compliance upon request.
- Q: What thicknesses and sizes are available?
- A: We stock thicknesses from 0.5 mm to 6.0 mm in sheet sizes of 1500×1500 mm or 3000×1500 mm. Custom thicknesses and sizes can be produced for volume orders. Contact us with your requirements.
- Q: Do you offer free samples?
- A: Absolutely. We supply free material samples for evaluation, typically 100×100 mm sheets or custom-cut gaskets. Request a free sample – sample orders are processed within 3-5 working days.
- Q: How does KXT 500 solve the cold flow (creep relaxation) problem of standard PTFE gaskets?
- A: The hollow aluminosilicate glass microspheres act as a rigid framework within the PTFE matrix. This reduces creep relaxation by up to 40% compared to unfilled PTFE (from >60% to ≤40%), ensuring bolt torque is maintained over time, drastically reducing the need for re-torquing and preventing flange leakage. This is particularly critical in chemical and pharmaceutical plants where unplanned downtime is costly.
Partner with Kaxite Sealing – your trusted modified PTFE gasket sheet manufacturer and supplier in China. With decades of PTFE compounding and gasket fabrication expertise, advanced CNC cutting capabilities, and an unwavering commitment to quality, we deliver sealing solutions that perform reliably in the most demanding chemical, pharmaceutical, and food processing applications. Request a free sample or get a tailored bulk quote today – our engineers respond within 24 hours.
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Contact Info
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Address
No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
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