LT3301 is a polyurethane system mainly formulated with polyether polyol, polymer polyol, chain extender, foam stabilizer, catalyst, and blowing agent. It is specifically designed for the production of slow-recovery viscoelastic foams with excellent pressure-relief performance.
Isocyanate Component
Isocyanate: Modified Isocyanate
Applications & Key Features
LT3301 is primarily used to produce slow-rebound foam, also known as viscoelastic foam, memory foam, low-resilience or zero-pressure foam, and pressure-relieving foam. After deformation under external force, the foam does not rebound immediately but gradually returns to its original shape after several seconds.
Typical applications include headrests and lumbar supports, pillows and U-shaped neck pillows, mattresses and seat cushions, toys and medical products. It ensures excellent slow-recovery and pressure-relief performance, low rebound resilience, high comfort and body-conforming support, and stable processing behavior.
Control Tests
The main testing parameters include reaction characteristics such as cream time and fiber time, and the core density of the free-rise foam.
Test Method: 120 g of total material at 25°C is poured into a 500 ml plastic cup to observe reaction behavior.
| Parameter | Value |
| Agitator Speed (rpm) | 1000–2000 |
| Agitator Diameter (mm) | 50 |
| Mixing Time (s) | 6–10 |
|
Notes: After mixing, pour the mixed ingredients into a new cup. |
Reaction Results
| Test Item | Reference Range | Unit | Test Result |
| Cream Time | 10–30 | s | 20 |
| Fiber Time | 30–40 | s | 32 |
| Tack-Free Time | 35–45 | s | 38 |
| Free-Rise Density | 40–100 | kg/m³ | 55 |
Notes: Test temperature: 25°C, and mixing ratio P: I = 100:40 (P= LT301, I = Modified Isocyanate)
Typical Foam Properties
| Property | Typical Value |
| Recovery Time | 3–25s |
| Rebound Resilience | ≤ 12 % |
| Tensile Strength | ≥ 50 kPa |
| Tear Strength | ≥ 1.3 N/cm |
| Elongation at Break | ≥ 100 % |
Laboratory Test Data
| Test Item | Polyether Polyol | Modified Isocyanate | Standard |
| Density (25°C) | 1.02 ± 0.05 g/cm³ | 1.2 ± 0.05 g/cm³ | GB/T 15223-2008 |
| Viscosity (25°C) | 1000 ± 200 cps | 210 ± 40 cps | GB/T 12008.7-2010 |
Packaging & Storage
| Component | Packaging | Storage Temp | Shelf Life |
| Polyether Polyol | 210 kg / drum | 15–35°C | 3 months |
| Modified Isocyanate | 230 kg / drum | 15–35°C | 3 months |
Both components are supplied separately in metal drums. Store in sealed metal drums in a cool, dry, and ventilated area. Avoid direct sunlight or moisture exposure.
Processing Requirements
| Parameter | Specification |
| Raw Material Temperature | 20–35°C |
| Demolding Time | Depends on product size |
| Machine Type | High-pressure or low-pressure PU foaming machine |
Reviews
There are no reviews yet.