Hydrolysis: Why Polyester-based Urethanes Fail in Humid Tropics
Problem Statement
Polyester-based urethanes (PEU) exhibit premature failure in humid tropical environments due to hydrolysis. This chemical degradation leads to loss of tensile strength, increased compression set, and eventual material breakdown.
Material Science Analysis
PEU polymers contain ester groups (-COO-) susceptible to hydrolysis. In high humidity, water molecules attack these ester bonds, breaking the polymer backbone. Fluorocarbon elastomers (FKM) and polyether-based urethanes (PTEU) resist hydrolysis due to their stable ether (-O-) and fluorine-carbon bonds.
Technical Specs
- PEU: Shore A 85, Tensile Strength 25 MPa, Elongation at Break 400%, Temperature Range -40°C to 100°C
- PTEU: Shore A 90, Tensile Strength 30 MPa, Elongation at Break 450%, Temperature Range -50°C to 120°C
- FKM: Shore A 75, Tensile Strength 20 MPa, Elongation at Break 200%, Temperature Range -20°C to 200°C
Technical Comparison
| Material | Hydrolysis Resistance | Compression Set (%) | Chemical Resistance | Temperature Range (°C) |
|---|---|---|---|---|
| PEU | Low | 35 | Moderate | -40 to 100 |
| PTEU | High | 20 | High | -50 to 120 |
| FKM | Very High | 15 | Very High | -20 to 200 |
Standard Compliance
RubberQ adheres to IATF 16949 standards for batch-to-batch consistency. Our in-house compounding ensures precise control of polymer ratios, fillers, and curing agents. Materials meet ASTM D2000 and ISO 3601 specifications for hydrolysis resistance and mechanical performance.
For custom material compound development or IATF 16949 documentation, consult RubberQ’s engineering department.
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