| Composition | ISOCYANATE PX 521HT A | POLYOL PX 522HT B | MIXING | |
| Mixing ratio by weight | 100 | 55 | ||
| Aspect | liquid | liquid | liquid | |
| Colour | transparent | bluish | transparent* | |
| Viscosity at 25°C (mPa.s) | Brookfield LVT | 200 | 1,100 | 500 |
| Density of parts before mixingDensity of the cured product | ISO 1675: 1985ISO 2781: 1996 | 1.07- | 1.05- | -1.06 |
| Pot life at 25°C on 155g (min) | - | 5 - 7 |
*PX 522 is available in orange ( PX 522HT OE Part B) and in red (PX 522HT RD Part B)
Vacuum Casting Processing Conditions
• Use in a vacuum casting machine.
• Heat the mould at 70°C (preferably polyaddition silicon mould).
• Heat both parts at 20°C in case of storage at a lower temperature.
• Weigh part A in the upper cup (do not forget to allow for residual cup waste).
• Weigh part B in the lower cup (mixing cup).
• After degasing for 10 minutes under vacuum pour part A in part B and mix for 1 minute 30 to 2 minutes.
• Cast in the silicone mould, previously heated at 70°C.
• Put in an oven at 70°C minimum.
• Demould after 45 minutes at 70°C.
• Carry out the following thermal treatment : 3 hr at 70°C + 2 hr at 80°C and 2hr at 100°C.
• Always while curing, place the part on stand.
Handling Precautions
Normal health and safety precautions should be observed when handling these products :
• ensure good ventilation
• wear gloves and safety glasses
For further information, please consult the product safety data sheet.
| Flexural modulus | ISO 178 : 2001 | MPa | 2.100 |
| Flexural strength | ISO 178 : 2001 | MPa | 105 |
| Tensile modulus | ISO 527 : 1993 | MPa | 2.700 |
| Tensile strength | ISO 527 : 1993 | MPa | 75 |
| Elongation at break in tension | ISO 527: 1993 | % | 9 |
| Charpy impact strength | ISO 179/1 eU : 1994 | kJ/m2 | 27 |
| Final hardness | ISO 868 : 2003 | Shore D1 | 87 |
| Glass temperature transition (Tg) | ISO 11359 : 2002 | °C | 110 |
| Heat deflection temperature ( HDT 1.8 MPa) | ISO 75 Ae :1993 | °C | 100 |
| Maximal casting thickness | mm | 10 | |
| Demoulding time at 70°C (thickness 3 mm) | min. | 45 |
Shelf life of both parts is 12 months in a dry place and in their original unopened containers at a temperature between 15 and 25°C.
Any open can must be tightly closed under dry nitrogen.
