XS-8320 Polyol / XS-H4532 Isocyanate is an MDI water blown polyurethane system, ideal for cold moulding of flexible foams with a final density between 45 and 65 kg/m³.
The system does not contain halogens or additional flame retardants. The system passes the UN Regulation No. 118. Rev.3 fire test (Annex 6-7-8). The system is particularly suitable for the production of flexible foams that can be used for furniture and transportation items (parts of different sizes with and without inserts).
| Property | Unit | XS-8320 Polyol | XS-H4532 Isocyanate | Test Method |
| Viscosity | mPa·s | 1390 (25°C) | 65 (25°C) | ASTM D 445 |
| Specific Gravity | g/cc | 1.03 (25°C) | 1.20 (25°C) | ASTM D 891 |
These are typical values and should not be construed as specifications.
Polyol ingredients may separate into different layers, therefore each container must be properly mixed before use. Although isocyanate component is a stable liquid at 15°C, it does crystallize below this temperature. The recommended technique for melting crystallized material is drum heating at 60-70°C for no more than 24 hours. Molds must be treated with a proper release agent.
| Process Conditions | Units | Limits |
| XS-8320 Polyol | pbw | 100 |
| XS-H4532 Isocyanate | pbw | 50 – 65 |
| Typical components temperature (Iso/Pol) | °C | 18-26 / 22-30 |
| Typical molds temperature | °C | 40 – 55 |
| Demolding time (1) | min | 4 – 6 |
- Depending on lso/Pol ratio
| Property | Unit | High Pressure Machine |
| XS-8320 Polyol | pbw | 100 |
| XS-H4532 Isocyanate | pbw | 56 |
| Cream time (2) | s | 10 – 16 |
| Gel time (2) | s | 75 – 85 |
2.Data refer to laboratory tests conducted with a high-pressure machine, performed with the components at 20-25°C and 50°C mold temperature. The values shown vary depending on the processing conditions.
The isocyanate component must be stored in a liquid state. In case of crystallization, it must be mixed according to the instructions in the paragraph “Recommended Process Conditions”.
| Property | Units | XS-8320 Polyol | XS-H4532 Isocyanate |
| Storage temperature | °C | 10 – 30 | 15 – 30 |
| Storage stability / Shelf life (3) | months | 6 | 6 |
3.Stored in the original sealed container in a dry place at the recommended temperatures.
| Property | Units | Value | Value | Method |
| XS-8320 Polyol | pbw | 100 | 100 | |
| XS-H4532 Isocyanate | pbw | 51 | 65 | |
| Molded Density | Kg/m³ | 55 | 60 | ISO 845 |
| CLD @ 40% | KPa | 7 | 13 | ISO 3386-1 |
| Compression Set | % | 8 | 6 | ASTM D 3574 |
| Elongation at break | % | 80 | 77 | ASTM D 3574 |
| Tensile Strength | KPa | 130 | 190 | ASTM D 3574 |
| Rebound rate | % | 58 | 65 | |
| Smell Level | ≤3.0 | ≤3.0 |
These are typical values and should not be construed as specifications.
The flame spread values, or the classification of its characteristics do not represent the actual dangers of these or other materials exposed to real fire conditions.
| Norm | Annex 7 | Annex 8 | Annex 8 |
| UN Regulation No. 118. Rev.3 (4) | Pass | Pass | Pass |
4.The flame spread values, or the classification of its characteristics, are intended merely indicative and do not in any way constitute sales specifications. The classification is therefore subject to the carrying out of suitable tests at laboratories authorized to issue the certification.
Safety Data Sheets (SDS) are available from our company. SDS are provided to help customers satisfy their own handling, safety and disposal needs and those that may be required by locally applicable health and safety regulations. SDS are updated regularly, therefore, please request and review the most current SDS before handling or using any product.
Our company strongly encourages its customers to review both their manufacturing processes and their applications of our company products from the standpoint of human health and environmental quality to ensure that Dow products are not used in ways for which they are not intended or tested. Personnel are available to answer your questions and to provide reasonable technical support. Our company product literature, including safety data sheets, should be consulted prior to use of our products.