PU Red and Green Colour- polyurethane
H-PU Red and Green seals are both made from high-performance polyurethane but serve different application needs.
- H-PU Red Seals offer excellent hydrolysis resistance, making them ideal for use with water-based fluids, seawater, and biodegradable oils. They are FDA-compliant, suitable for food-grade equipment, and can handle higher temperatures and more demanding environments like marine, mining, and hydraulic systems.
- H-PU Green Seals are meant for general-purpose sealing with mineral oils, air, and water. While they have strong mechanical properties, they are not hydrolysis-resistant and are best suited for standard hydraulic and pneumatic applications
| Property | H-PU Red Seal | H-PU Green Seal |
|---|---|---|
|
Hydrolysis Resistance |
Excellent – Suitable for water, glycol, and biodegradable fluids |
Moderate – Suitable for mineral oils, air, water |
|
FDA Compliance |
Yes – Meets FDA CFR 177.2600 |
No |
|
Temperature Range |
-25°C to +150°C (Short-term: +165°C) |
Up to +120°C |
|
Hardness |
95 ±3 Shore A / 45 ±3 Shore D |
~95 Shore A |
|
Tensile Strength
|
>45 N/mm² |
>50 N/mm² |
|
Elongation at Break |
>370% |
>330% |
|
Tear Strength |
>100 N/mm |
>100 N/mm |
|
Abrasion Loss |
<16 mm³ |
17 mm³ |
|
Compression Set |
<17% (at 70°C for 24h) |
<27% (at 70°C for 24h) |
|
Applications |
Hydraulic, marine, mining, food-grade equipment |
General hydraulic/pneumatic sealing, less aggressive fluids |