Precision Machining
- CNC Machining Service
- CNC Milling
- CNC Turning
- Automatic Turning
- Machining Screw/Rivet
- Wire EDM Machining
- Casting & CNC
- Aluminum Profile & CNC
- Cold Heading & CNC
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
Materials
CNC Machining in PTFE
High strength and toughness, fatigue resistant. Alloy steels incorporate additional alloying elements beyond carbon, leading to heightened hardness, toughness, fatigue resistance, and wear resistance
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PTFE
Designers and engineers frequently choose PTFE for CNC machining and CNC milling parts. Makes sense. This all-purpose metal has been proven to offer:
- * Excellent machinability
- * High strength
- * Hardness
- * Heat tolerance
- * Corrosion resistance
- * Electrical conductivity
- * Low weight
- * Low cost
- * Overall versatility
Description
- Applications
- Chemical seals/gaskets, non-stick coatings, semiconductor components, bearing liners, medical tubing, electrical insulators
- Strengths
- Extreme chemical inertness (resists all solvents/acids), Ultra-low friction coefficient (0.04-0.1), Continuous service up to 260°C (500°F), Exceptional dielectric properties
- Weaknesses
- Prone to cold flow (creep under load), Poor radiation resistance, Machining difficulty (requires specialized tooling)
- Process compatibility
- Compression molding, CNC machining, paste extrusion, ram extrusion
- Surface Treatment
- Sodium etching, plasma treatment (for adhesives), laser texturing
Characteristics
- Price
- $50-150/kg ✦ 3-5x cost of PEEK
- Lead Time
- 15-25 days (molding) / 8-12 days (machining)
- Wall Thickness
- 1-50mm (molded blocks) / 0.5-5mm (films)
- Tolerances
- ±0.25mm (±0.01") molded / ±0.12mm (±0.005") machining
- Max part size
- 1,500 x 1,500 x 500 mm (molded slabs) / 600 x 600 x 300 mm (machined)
PTFE
| Grade & Composition | Key Characteristics | Primary Applications |
|---|---|---|
| Virgin PTFE (e.g., Teflon™ 7A) | • Density: 2.15-2.20 g/cm³ • Tensile strength: 20-35 MPa • Continuous use temp: -200°C to 260°C • Friction coefficient: μ=0.04-0.10 | • Chemical linings • Non-stick cookware • Medical tubing |
| 25% Glass Fiber Reinforced (e.g., Teflon™ GX) | • Density: 2.25-2.35 g/cm³ • Compressive strength: 50 MPa • Creep resistance: 3× improved • Wear rate: 0.5 mm³/(N·m) | • Piston rings • Bearings in chemical pumps • Valve seats |
| 15% Graphite Filled (e.g., Teflon™ GT) | • Thermal conductivity: 0.45 W/(m·K) • PV limit: 20,000 psi·ft/min • Electrical conductivity: 10³ Ω·cm | • Electrical bushings • Fuel cell components • Dry running seals |
| Bronze Filled (60%) (e.g., Teflon™ B) | • Thermal conductivity: 0.95 W/(m·K) • Hardness: 65 Shore D • Load capacity: 140 MPa | • Thrust washers • Gear pads • High-load bearings |
| Property | Test Standard | Virgin PTFE | 25% GF PTFE | Bronze Filled |
|---|---|---|---|---|
| Tensile Strength | ASTM D638 | 25-35 MPa | 30-40 MPa | 15-25 MPa |
| Elongation at Break | ASTM D638 | 250-350% | 150-250% | 100-150% |
| Compressive Strength | ISO 604 | 12 MPa | 50 MPa | 140 MPa |
| Coefficient of Friction | ASTM D1894 | 0.05-0.10 | 0.10-0.20 | 0.10-0.15 |
| Volume Resistivity | IEC 60093 | 10¹⁸ Ω·cm | 10¹⁶ Ω·cm | 10⁴ Ω·cm |
| Limiting Oxygen Index (LOI) | ISO 4589 | 95% (all grades) | ||
Critical Processing Requirements
•Sintering Profile: Requires 380°C ±5°C for 4-8 hrs (ramp rate 30°C/hr) to achieve >90% crystallinity
•Cold Flow Behavior: Creep deformation occurs under sustained load; design safety factor ≥3× required
•Machining Guidelines: High-speed tools (500-800 m/min) with neutral rake angles; avoid clamping deformation
Chemical Industry Applications
•Corrosion Resistance: Impervious to all acids (including aqua regia), bases, and solvents except molten alkali metals and fluorine gas
•Lining Systems: 3-10 mm thick sheets bonded to steel vessels for sulfuric acid storage (≥98% concentration)
Electrical & Tribological Advantages
•High-Frequency Insulation: Dielectric constant 2.1 @ 1GHz (lowest among solids) for 5G antenna components
•Sealing Systems: Self-lubricating in cryogenic LNG pumps (-162°C) with PV limit 15,000 psi·ft/min
Aluminum Alloys for Machining
LML offers several aluminum alloys in its long list of available manufacturing materials. Two of those alloys are especially well-suited material options for CNC machining, whether milling or turning: Aluminum 6061 and 7075.Aluminum 7075 T651 and T7: Benefits include high strength, hardness, low weight, corrosion resistance, and high heat tolerance. See data sheet for more information.Aluminum 2024 T3: This high-strength alloy offers a high strength-to-weight ratio and high corrosion resistance. See data sheet for more information.GET INSTANT QUOTE
Gallery of Anodized Parts Manufactured by LML
The color of anodized finishes may exhibit some degree of variation due to standard alloy tolerance differences. Please refer to the color scheme below to observe the range of available colors.
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Read more about quality assuranceFAQs
LML takes the stress out of manufacturing by guaranteeing the quality and consistency of every part. Each order is dimensionally and visually inspected by our in-house quality control team to make sure it meets the LML Standard. If you’re not satisfied with your order, we’ll remake your parts as fast as possible, free of charge, or refund you - whichever you prefer.
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Take advantage of our network and see what PTFE can do for you
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
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