DIMONDS® A1853 Blend Polyols for Refrigerators & Freezers
Product Description
DIMONDS® A1853 is a compounded polyether polyol developed for refrigerators and freezers. It is developed to be used with pentane, such as cyclopentane and cyclopentane/isopentane(7/3), as blowing agent. It contains polyether polyol, silicone surfactant, catalysts and water. It does not contain any physical blowing agent, therefore the addition will be done before foaming the product.
Typical Properties
| Item | Unit | DIMONDS® A1853 | DIMONDS® ISO1800 |
| Appearance | By visual | Transparent liquid | Brown liquid |
| Viscosity, 25℃ | mpa.s | 3000-4000 | 150-250 |
| Gravity,20℃ | g/ml | 1.08±0.04 | 1.24±0.01 |
| Shelf life | month | 6 | 12 |
Reaction properties (hand test)
| Item | Unit | Specification |
| Cream time | sec | 10-12 |
| Gel time | sec | 60-80 |
| Free rise density | kg/m3 | 26-28 |
Recommended processing information
| Item | Unit | Specification |
| Component temperature | ℃ | 20±3 |
| Mold temperature | ℃ | 40±3 |
| Dynamic pressure | kPa | 120±10 |
| Demold time | Min | >6 |
Remarks: It is recommended to utilize high pressure foaming machinery. The chemicals should be adjusted to the correct temperature between 18-22℃ to ensure reactivity and viscosity suitable for processing.
The mixing pressure has to be set for both components at 120-150 bar.
The mould temperature recommended is 35-45℃ to guarantee good foam performances.
Foam properties
| Item | Unit | Specification | Test standard |
| Core density | kg/m3 | ≥33 | ASTM D1622-08 |
| Thermal conductivity, 10℃ | W/(m.k) | ≤0.021 | ASTM C518-10 |
| Compressive strength | kPa | ≥140 | ASTM D1621-10 |
| Closed cell content | % | ≥90 | ASTM D6226 |
| Water absorb | % | ≤3 | ASTM C209-12 |
| Thermal stability, -30-80℃ | % | ≤1.5 | ASTM D2126-09 |
The above testing data have been generated in lab or field conditions which are typical for this application. They are believed to be correct but data variations due to varying processing or ambient conditions can not be excluded. The customer remains responsible for making his own interpretation of data and suitability of the chemicals to his particular operation.
Handling and Storage
DIMONDS® A1853 should be protected from moisture by keeping containers sealed when not in use. Drums have to be stored indoors to protect the material from water ingress, frost and direct heat from the sun. Under temperature conditions and in properly sealed containers, the storage life of the polyol is 6 months and 12 months for isocyanate. The optimum storage temperature should be 10-30℃.
