Asbestos PTFE Packing

What is Asbestos PTFE Packing?

Asbestos PTFE Packing (also sold as asbestos teflon packing or asbestos packing with PTFE) is a braided gland packing manufactured from high-grade asbestos yarn thoroughly impregnated with PTFE dispersion. It combines asbestos fiber strength and heat resistance with PTFE’s low friction and chemical resistance to deliver a cost-effective sealing solution for pumps, valves, mixers and other rotary/reciprocating equipment in industrial service.

Composition & Manufacturing
Asbestos PTFE packing is produced by braiding high-quality asbestos yarn (typically chrysotile grades) and impregnating each fiber with a PTFE dispersion (sometimes combined with lubricants). The final braid may be finished with additional lubricants or graphite coatings on request. The PTFE impregnation reduces friction and improves chemical resistance while asbestos provides thermal stability and compressibility.

Typical Applications
Used widely as gland packing for:

• Rotary pumps (centrifugal, rotary)—especially medium-speed services

• Reciprocating pumps and piston seals

• Valves, mixers, agitators and steam fittings

• Hot water, steam, oils, mild acids and alkalis, many industrial chemical services.

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Key Technical Parameters (Service Limits & Performance)

Service Temperature: typically -100°C to +260°C (some suppliers list up to 280°C for specialized grades).
Recommended Maximum Pressure (typical working guidance): rotary pump ~10 bar (1.0 MPa); reciprocating pump ~15–20 bar (1.5–2.0 MPa); static flange/valve applications up to 40–100 bar depending on packing cross-section and gland design. (See supplier datasheets for exact product grade rating.)
PH Range: broadly 2–13 (varies by impregnation and finish).
Linear (shaft) Speed: up to ~10–12 m/s for dynamic services (higher speeds require special grades).

Note: exact allowable pressure/temperature depends on gland design, number of packing rings, shaft speed, and equipment. Always consult the product datasheet and engineering tables.

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Dimensions & Common Sizes

Available cross-section ranges: from 3×3 mm up to 100×100 mm for square/rectangular braids; round/flat sizes offered as standard spools or pre-cut rings. Common stocked square/round sizes:
3 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 19 mm (3/4″), 22 mm (7/8″), 25 mm (1″), 32 mm (1¼”) etc. Packaging: coils/spools of 5 kg or 10 kg, or pre-cut lengths/rings on request.

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Product Variants & Customization

• Standard PTFE-impregnated asbestos braid (soft finish) — for general rotary/reciprocating pumps.

• PTFE + graphite coated — improved start-up lubrication and lower leakage.

• Wire-reinforced (Inconel / stainless)` — for high pressure or extrusion resistance.

• Pre-formed rings, cut lengths, stamped seals or printed markings — available as custom services.
  We offer OEM box labeling, private-label reels, and ISO/EN batch traceability on request.

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Advantages — Why Choose Our Asbestos PTFE Packing (Differentiation)

• Controlled PTFE impregnation process for even lubricant distribution — reduces initial run-in leakage and gland adjustments.

• Strict fiber selection (chrysotile grades with documented sources) to deliver consistent density and long life.

• Optional wire reinforcement for heavy-duty valves and high-pressure pumps — improves extrusion resistance vs plain braid.

• Custom finishing & low-abrasion PTFE lubricant to protect shaft sleeves and extend service intervals.

• Full testing & inspection: density, mass per metre, and batch traceability; optional third-party testing available.
  These service-level and QA commitments are intended to reduce unplanned downtime and total cost of ownership compared with generic commodity packings.

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Comparison Table — Asbestos PTFE vs Other Common Packing Materials

(References: industry datasheets and packing catalogs; see technical literature for precise limits.)

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Safety, Regulations & Replacement Guidance

• Many regions and customers prefer or require non-asbestos packings due to health and regulatory concerns. We can supply non-asbestos equivalents (aramid/PTFE, graphite-PTFE blends) and help evaluate replacements on a per-service basis.

• When asbestos packings are used, proper handling, PPE, and local disposal rules must be followed; provide Safety Data Sheets (SDS) and handling instructions with every shipment. (We can supply SDS and certificate of analysis upon order.)

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Frequently Asked Questions (FAQ)

Q1: What is the MOQ (minimum order quantity)?
A1: Typical MOQ for standard stocked sizes is 1 reel (5 kg/10 kg) or custom MOQ depending on size and finish; small sample lengths or pre-cut rings can be supplied for evaluation. Contact sales for exact MOQ per SKU.

Q2: What is the usual lead time?
A2: For in-stock common sizes: 3–7 business days for samples or small orders; for custom grades, reinforced styles, or marked reels: 2–5 weeks depending on quantity and finishing. Exact lead time confirmed at order.

Q3: How is the product shipped and what are shipping restrictions?
A3: Shipped in export cartons on pallets by sea/air. Some jurisdictions restrict or disfavor asbestos-containing goods — customer must confirm local import rules. We provide full docs (SDS, COO) and can advise on shipping routes.

Q4: Do you offer customization and pre-cut rings?
A4: Yes — we offer custom cross-sections, wire reinforcement, graphite coating, pre-cut rings, stamping, and private labeling. Tooling or spool marking may incur setup lead time and fees.

Q5: Can you help with a non-asbestos replacement?
A5: Yes — we provide aramid/PTFE, expanded graphite/PTFE, and other non-asbestos alternatives with equivalent performance ranges and will recommend suitable replacements based on application data.

Q6: What inspection/test reports do you provide?
A6: Batch density, mass per metre, dimensional check, and optional third-party lab testing upon request. All shipments include a certificate of conformity where required.

Q7: Is asbestos PTFE packing safe for food or potable water service?
A7: Asbestos-containing materials are generally not recommended for food, beverage or potable water contact. For such services, request certified non-asbestos alternatives.

Q8: What payment terms do you accept?
A8: Typical T/T 30% deposit, 70% before shipment; L/C at sight may be accepted for larger orders. Terms negotiable for long-term contracts.

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Technical Datasheet

• Material: Chrysotile asbestos yarn impregnated with PTFE dispersion

• Color: White / off-white (typical)

• Density: 1.4–1.8 g/cm³ (grade dependent)

• Temperature: -100°C → +260°C (typical); to 280°C for special grades.

• Pressure: Rotating ~10 bar; Reciprocating ~15–20 bar; Static up to 40–100 bar (depending on section/installation).

• PH Range: 2–13 (product dependent)

• Standard sizes: 3×3 mm to 100×100 mm (coils / pre-cut rings available).