| Composition | ISOCYANATE PX 5210 | POLYOLPX 5212 | MIXING | ||
| Mixing ratio by weight | 100 | 50 | |||
| Aspect | liquid | liquid | Liquid | ||
| Colour | transparent | bluish | transparent | ||
| Viscosity at 25°C (mPa.s) | BROOKFIELD LVT | 200 | 800 | 500 | |
| Density at 25°C | (g/cm3) | ISO 1675 : 1985ISO 2781 : 1996 | 1,07- | 1,05 | 1,06 |
| Density of the cure product at 23°C | |||||
| Pot life at 25°C on 150g (min) | Gel Timer TECAM | 8 | |||
Processing Conditions
The PX 5212 must be only used in a vacuum casting machine and cast in a pre-heated silicone mould. The respect of 70°C temperature for the mould is imperative.
Vacuum casting machine utilisation:
• Heat both parts at 20 / 25°C in case of storage at a lower temperature.
• Weigh isocyanate in the upper cup (do not forget to allow for residual cup waste).
• Weigh polyol in the lower cup (mixing cup).
• After degassing for 10 minutes under vacuum pour isocyanate in polyol and mix for 4 minutes.
• Cast in the silicone mould, previously heated at 70°C.
• Put in an oven at 70°C.
1hour for 3 mm thickness
Open the mould, cooling the part with compressed air.
Remove the part.
Post curing treatment is needed to get final properties (after demoulding) 2h at 70°C + 3h at 80°C+ 2h at 100°C
Use a fixture to handle the part during the post curing treatment
NOTA: Elastic memory material offset any deformation observed during demoulding.
It is important to cast the PX 5212 in a new mould without casting resin previously inside.
| Hardness | ISO 868 : 2003 | Shore D1 | 85 |
| Tensile modulus of elasticity | ISO 527 : 1993 | MPa | 2,400 |
| Tensile strength | ISO 527 : 1993 | MPa | 66 |
| Elongation at break in tension | ISO 527 : 1993 | % | 7.5 |
| Flexural modulus of elasticity | ISO 178 : 2001 | MPa | 2,400 |
| Flexural strength | ISO 178 : 2001 | MPa | 110 |
| Choc impact strength (CHARPY) | ISO 179/1eU : 1994 | kJ/m2 | 48 |
| Glass transition temperature (Tg) | ISO 11359-2 : 1999 | °C | 95 |
| Refractive index | LNE | - | 1,511 |
| Coefficient og light transmission | LNE | % | 89 |
| Heat deflection temperature | ISO 75 : 2004 | °C | 85 |
| Maximal casting thickness | - | mm | 10 |
| Time before demoulding at 70°C (3mm) | - | min | 60 |
| Linear shrinkage | - | mm/m | 7 |
Storage Conditions
Shelf life of both parts is 12 months in a dry place and in their original unopened containers at a temperature between 10 and 20°C. Avoid storage for long time at a temperature over 25°C.
Any open can must be tightly closed under dry nitrogen.
Handling Precautions
Normal health and safety precautions should be observed when handling these products :
Ensure good ventilation
Wear gloves, safety glasses and waterproof clothes
For further information, please consult the product safety data sheet.
