Virgin PTFE

Virgin PTFE (Polytetrafluoroethylene) is the highest purity grade of Teflon, renowned for its near-universal chemical resistance and the lowest coefficient of friction of any solid material. Capable of operating from -200°C to +260°C, it is an essential material for high-performance seals, medical fluidics, and electrical insulators. Jucheng Precision specializes in the precision CNC machining of this exceptionally soft polymer, utilizing ultra-sharp tooling and specialized workholding to overcome challenges like material creep and high thermal expansion. Whether you need complex gas-tight seals or FDA-compliant medical manifolds, our expertise ensures your PTFE parts are delivered with burr-free edges and the precise dimensions required for critical industrial assemblies.

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PTFE / Teflon Material Variants

グレード	一般名	主な特性	代表的な用途
Virgin PTFE	Electrical Grade	99.9% Pure. Lowest friction, highest chemical resistance, and best dielectric properties. FDA compliant.	Chemical seals, medical components, laboratory fluidics, electrical insulators.
Mechanical PTFE	Reprocessed PTFE	Contains recycled material. Lower cost but reduced mechanical and electrical properties. Not for food use.	Non-critical spacers, washers, wear pads.
Glass-Filled PTFE	15% / 25% GF PTFE	Reinforced with glass fibers to reduce “cold flow” (creep) and improve compressive strength.	Valve seats, gaskets, high-pressure bearings.
Bronze-Filled PTFE	Bearing Grade	Added bronze powder for superior wear resistance and thermal conductivity. Best for heavy loads.	Hydraulic cylinder guides, dynamic seals, slider plates.

Virgin PTFE Machining Capabilities

能力	技術的説明	Juchengの強み
Precision Seal Turning	Machining intricate lip profiles and fine grooves for high-performance hydraulic and pneumatic seals.	We achieve burr-free edges and Ra 0.4μm finishes directly off the tool, critical for gas-tight and vacuum-tight sealing integrity.
Thin-Wall Sleeve Machining	Boring and turning thin-walled PTFE liners and sleeves (down to 0.5mm) without material tearing.	Using specialized air-chucks and internal mandrels, we prevent the deformation of the soft PTFE, ensuring perfect concentricity.
Zero-Burr Micro-Drilling	Drilling micro-channels in PTFE blocks for laboratory fluidic manifolds and chemical analyzers.	Our ultra-sharp micro-tooling ensures internal channels are smooth and free of the stringy burrs common when machining soft Teflon.
Dimensional Stability Control	Managing the high thermal expansion of PTFE during the machining process to hold tight tolerances.	We machine in a climate-controlled facility and utilize specific “dwell periods” to ensure the part reaches thermal equilibrium before final sizing.

Fabrication Guidelines for Virgin PTFE

クランプ感度：
PTFE is extremely soft and prone to “cold flow” (permanent deformation under pressure). ヒント: We use custom soft jaws that encapsulate the part or vacuum workholding to prevent clamping marks and geometry distortion.

Thermal Expansion Awareness:
PTFE has a massive coefficient of thermal expansion and undergoes a phase change at 19°C. ヒント: We maintain a stable 20°C environment for machining and inspection to ensure dimensions remain consistent from our factory to your assembly line.

Sharp Tooling Strategy:
Dull tools will push and smear the material rather than cut it. ヒント: We use high-rake, polished uncoated carbide tools. This ensures the PTFE is sheared cleanly, resulting in the best possible surface finish and dimensional accuracy.

Stress Relief:
Large PTFE billets often contain internal stress from the extrusion process. ヒント: We perform roughing passes followed by a stabilizing period to allow the material to “relax” before performing final critical finish passes.

主な用途

Chemical & Fluid Handling
Valve seats, pump diaphragms, and gaskets that require near-universal chemical r

特性

密度	2.14 - 2.18 g/cm³
引張強度	20 - 35 MPa
Coefficient of Friction	0.05 - 0.10
硬さ	55 - 65 Shore D
破断伸び	250 - 450%
熱伝導率	0.25 W/m-K
連続使用温度	-200 to +260 °C
吸水率	< 0.01%
絶縁破壊強度	20 - 60 kV/mm
被削性評価	中程度
最大部品サイズ	2000 x 800 x 600 mm