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This PTMEG-MDI hydrolysis resistant polyurethane elastomer is a high-performance casting material specifically formulated for prolonged exposure to water, high humidity, and underwater environments. Engineered with a polytetramethylene glycol (PTMEG) backbone and cured with 1,4-butanediol (BDO), this elastomer delivers exceptional hydrolytic stability that far exceeds conventional polyester-based polyurethanes.
When submerged in 80°C water for over 5,000 hours, it retains more than 85% of its original mechanical properties, making it the definitive choice for marine hydraulic seals, offshore industrial rollers, dock fenders, subsea coupling components, and desalination equipment parts.
Key Features
Superior Hydrolytic Stability: PTMEG backbone resists water degradation for over 5,000 hours at 80°C continuous immersion, retaining more than 85% of original mechanical properties.
MDI-Based Isocyanate System: Provides higher reactivity and better mechanical strength than TDI-based alternatives, with improved industrial hygiene due to lower vapor pressure.
Customizable Shore Hardness Range: Available from Shore 85A to 95A through precise stoichiometric adjustment, enabling tailored flexibility-to-rigidity balance.
BDO Cured with Optimized Processing Window: 3 to 6 minute pot life at 80°C processing temperature and demolding within 30 to 60 minutes at 100°C.
Excellent Dynamic Mechanical Performance: Tensile strength 35-55 MPa, elongation 400-650%, and tear resistance 85-120 kN/m for reliable performance under cyclic loading.
Low Compression Set for Long-Term Sealing: Compression set values below 25% after 22 hours at 70°C ensure consistent sealing force retention.
Premium Abrasion Resistance: DIN 53516 abrasion loss below 35 mm³ provides exceptional wear life in abrasive environments.
Technical Specifications
Parameter
Specification
Chemical System
PTMEG-MDI-BDO (MDI/Butanediol)
Shore Hardness Range
85A / 90A / 95A (Customizable)
Hydrolytic Stability
> 5,000 hours at 80°C H₂O immersion
Tensile Strength (ASTM D412)
35 - 55 MPa
Elongation at Break (ASTM D412)
400% - 650%
Tear Strength (ASTM D624 Die C)
85 - 120 kN/m
Compression Set 22h/70°C (ASTM D395)
≤ 25%
Abrasion Loss (DIN 53516)
≤ 35 mm³
Rebound Resilience
35% - 50%
Specific Gravity
1.08 - 1.15 g/cm³
Pot Life at 80°C
3 - 6 minutes
Demolding Time at 100°C
30 - 60 minutes
Service Temperature Range
-30°C to +90°C (continuous)
Applications
This PTMEG-MDI elastomer is purpose-built for industries demanding prolonged water contact reliability. Primary applications include marine hydraulic cylinder seals and wipers for offshore platforms, subsea ROV buoyancy components, dock fender blocks, desalination plant pump diaphragms, underwater industrial rollers, water treatment plant scraper blades, marine propeller shaft bearings, hydroelectric turbine seal rings, irrigation system pump components, and offshore wind turbine cable protection systems.
Packaging & Quality Assurance
Each batch is supplied in nitrogen-sealed 20kg or 200kg steel drums to prevent moisture contamination. The prepolymer component is packaged under dry nitrogen blanket with desiccant breather caps, ensuring a minimum 12-month shelf life. Every production batch undergoes full quality testing including NCO content titration, viscosity measurement, and physical property validation per ASTM and DIN standards. Our ISO 9001:2015 certified quality management system ensures batch-to-batch consistency and full traceability.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company
Year Established:
2013
Total Annual:
10000000-20000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Qingdao Exceed Fine Chemicals Co., Ltd is a high-tech enterprise that integrates manufacturing and trading. We specialize in the production of polyurethane-based products.
Our company is dedicated to investing in research and development of cutting-edge products, collaborating with leading Chines...
Qingdao Exceed Fine Chemicals Co., Ltd is a high-tech enterprise that integrates manufacturing and trading. We specialize in the production of polyurethane-based products.
Our company is dedicated to investing in research and development of cutting-edge products, collaborating with leading Chines...
