Semi-Finished Material PU Tube

1. Product Overview

2. Product Classification

2.1 By Molding Process

• Cast CPU Semi-Finished Tube (Recommended) Adopts vacuum casting integral forming and post-curing treatment. It has ultra-low internal stress, uniform density, excellent concentricity, no deformation after precision turning, and superior anti-extrusion performance. It is the preferred material for high-pressure hydraulic sealing parts.
• Extruded TPU Semi-Finished Tube Thermoplastic continuous extrusion molding, with low mass production cost and unlimited length. Suitable for low-pressure light-duty seals and simple wear-resistant parts, with slight anisotropy for thick-wall products.

2.2 By PU Material Grade

• Polyester PU Core advantages: ultra-high abrasion resistance, excellent oil resistance and high mechanical strength. Ideal for standard hydraulic systems with mineral oil medium, widely used in construction machinery and hydraulic cylinders. Limitation: not suitable for long-term humid and aqueous working environments.
• Polyether PU Core advantages: excellent hydrolysis resistance, microbial corrosion resistance and low-temperature resistance. Perfect for water-glycol, emulsion, seawater and high-humidity working conditions. Limitation: slightly weaker oil resistance than polyester PU.

3. Core Technical Parameters

• Available Hardness: Shore A 85A / 90A / 92A / 95A (customizable)
• Working Temperature: -35℃ ~ +100℃ (short-term peak 110℃)
• Max Working Pressure: 32MPa (with back-up ring)
• Density: 1.21~1.25 g/cm³
• Feature Advantage: 3-5 times higher abrasion resistance than ordinary rubber, low compression set, long dynamic service life
• Unsuitable Medium: concentrated acid, ketone solvents, high-temperature steam

4. Standard Specifications

• Dimension Standard: OD × ID × Length (Outer Diameter × Inner Diameter × Length)
• Conventional Size Range: OD 20mm~500mm, ID 10mm~420mm
• Standard Fixed Length: 200mm / 300mm / 500mm / 1000mm
• Minimum Wall Thickness: ≥3mm (stable casting molding)
• Regular Colors: Red, Green, Blue, White

5. Key Advantages

1. No Mold Cost: Support non-standard custom sizes, fast prototyping and small-batch production, greatly reducing customer mold investment.
2. Stable Machining Performance: Professional post-curing process eliminates internal stress, ensuring no deformation and high dimensional accuracy after CNC turning.
3. Superior Sealing Performance: High tensile strength, outstanding anti-extrusion and wear resistance, adapting to high-pressure and reciprocating dynamic working conditions.
4. High Flexibility: Optional multiple hardness and material grades to match different media and working scenarios.

6. Application Scope

• PU wiper seals (DHS, DKB, LBH series)
• Rod & piston seals (UN, UHS, USH, ODI series)
• Hydraulic buffer rings, wear-resistant guide rings
• PU back-up rings for step seals
• Custom special-shaped polyurethane sealing components

7. Quality & Certification

• Compliant with RoHS environmental protection standards
• SGS test report available
• Batch physical performance test data support
• Custom technical datasheet (TDS) provided

8. Custom Service