Products

For dry-running bearings, valve stems, and reciprocating seal applications, the PTFE tube with polyimide filler soft mating surface is engineered to minimize counterface wear while maintaining predictable breakaway torque. This material provides a controlled compromise between the self-lubricating behavior of virgin PTFE and the load-bearing capability of a rigid filler, making it suitable for low-speed oscillating motion and continuous rotation where external grease cannot be used. When you select a polyimide filled PTFE tube for dry running, you get a product that resists stick-slip without relying on external lubrication. The dispersed polyimide phase reduces abrasive contact and supports the sliding interface, which is particularly valuable in soft mating surface configurations where a harder filled grade would cause scoring or polishing. Our PI PTFE tubing low friction is produced with tightly controlled resin particle size and filler distribution to deliver a static and dynamic friction response that remains stable over thousands of cycles. As a dedicated polyimide PTFE tube manufacturer, we offer dimensional inspection on every batch, including wall thickness variation and ovality checks. The resulting low wear PTFE tube PI filled supports extended maintenance intervals in hydraulic cylinders, pneumatic actuators, and rotary unions, especially in food, medical, and semiconductor equipment where contamination must be avoided.

The PTFE tube with polyimide filler soft mating surface is available in stocked lengths and custom-machined sizes for pilot runs and volume production. The polyimide additive raises compressive strength and reduces cold flow, which helps the tube retain its roundness and wall thickness under radial loads. The soft contact face also allows minor misalignment without damaging plated, anodized, or coated rods. Standard dimensional options, material properties, and mechanical limits are summarized below. Custom configurations are available for thin-wall designs down to 0.25 mm, chamfered ends, and split lengths for installation over continuous shafts. All parts are cleaned and packaged in protective sleeves to avoid surface contamination before assembly. For high-volume OEM programs, batch-level certificates of conformance and material test reports are available upon request.

• Available inner diameters: 2 mm to 100 mm (0.079 in to 3.937 in)
• Wall thickness range: 0.5 mm to 10 mm (0.020 in to 0.394 in), with thin-wall options down to 0.25 mm for compact housings
• Standard lengths: 100 mm, 200 mm, 500 mm, or custom cut from 1 mm increments
• Filler content: 15%, 20%, or 25% polyimide by weight, selected to balance wear resistance and conformability
• Color: dark gray to black, depending on filler content and processing temperature
• Temperature range: -129°C to 260°C (-200°F to 500°F) continuous service
• Dynamic friction coefficient: 0.06 to 0.12 against steel with 0.2 µm Ra finish
• Shore D hardness: 62 to 66
• Concentricity: within 0.05 mm for tubing up to 25 mm outside diameter
• Cut tolerance: ±0.25 mm standard, ±0.10 mm optional