Sources & References
ISO 4649 Rubber, vulcanized or thermoplastic — Determination of abrasion resistance
ISO
Referenced for polyurethane abrasion resistance testing criteria.
Huayun Wire Mesh Polyurethane Screen Panel Internal Quality Standard
Huayun Wire Mesh Quality Department
Referenced for mechanical property specifications, hardness ranges, and outgoing inspection requirements.
Huayun Wire Mesh Polyurethane Screen Panel Failure Follow-up Records
Huayun Wire Mesh After-sales Department
Used to categorize blinding, tearing, and aging failure modes.
Scope & Limitations
Intended for initial polyurethane screen mesh selection in mining wet screening, noise-sensitive, and service-life-priority applications. Strong acid, organic solvent, or high-temperature conditions require separate media compatibility confirmation.
View Factory & Quality Commitments
View Factory & Quality CommitmentsMaterial Characteristics of Polyurethane Screen Mesh
Polyurethane (PU) is a high-molecular-weight elastomer with a broad mechanical performance range (Shore A 20–98), combining the elasticity of rubber with the rigidity of engineering plastics.
Key performance specifications (Huayun standard):
- Tensile strength: ≥ 35 MPa
- Elongation at break: ≥ 350%
- Shore hardness: Shore A 65–90 (adjustable to application requirements)
- Operating temperature: −30°C to +80°C
- Abrasion resistance: ISO 4649 volume loss < 60 mm³
Hardness (Shore A) Selection
| Hardness | Recommended Application | Characteristics |
|---|---|---|
| Shore A 65–70 | Fine, wet ore (< 5 mm) | High elasticity, strong self-cleaning action |
| Shore A 75–80 | Medium ore (5–25 mm) | Balanced wear resistance and elasticity — most common choice |
| Shore A 85–90 | Coarse, heavy-duty ore (> 25 mm) | High load capacity, reduced elasticity |
Common misconception: Higher hardness does not mean better wear resistance. Overly hard PU (Shore A > 90) loses elasticity in fine wet ore screening — particles wedge into apertures and cannot self-clear, causing blinding failure.
Application Boundaries
Polyurethane is the better choice for: fine wet ore (0.5–15 mm), noise-sensitive plant areas (10–15 dB reduction), moderately corrosive slurries, and service-life-priority applications (typically 3–5× the life of metal mesh).
Metal mesh is the better choice for: operating temperatures above 80°C, contact with organic solvents or strong acids (pH < 3), applications requiring high-precision separation (ISO 3310-1 tolerances), and heavy impact screening with apertures above 50 mm.
Common Failure Modes
| Failure Symptom | Root Cause | Corrective Action |
|---|---|---|
| Early tearing (< 1 month) | Hardness too low or insufficient installation tension | Step up one hardness grade; inspect installation |
| Aperture blinding | Hardness too high or excessive feed moisture | Step down one hardness grade; increase wash water flow |
| Surface cracking | Ozone aging (outdoor storage) | Store away from UV/ozone; stock held > 12 months should undergo aging assessment before use |
| Underside support deformation | Embedded steel reinforcement corroding and expanding | Specify stainless steel internal framework for acidic applications |
Installation and Maintenance
- Installation orientation: Follow the directional arrow marked by the manufacturer — incorrect orientation causes uneven wear patterns.
- Tensioning: Tensioned screen panels are typically pre-stretched 2–4%.
- Routine inspection: Replace panels when measured aperture exceeds 20% above the nominal value.