Polyurethane Crystal Clear 1200
This version is suitable for molding medium-sized pieces in one cast. The low viscosity allows for easy degasification. This material is easy to handle by hand. However, we recommend mechanical processing for professional use and large castings. This Polyurethane contains no mercury and is therefore safer to work with than other types of clear polyurethane.
- Suitable for outdoors
- Contains no mercury
- Low viscosity
- Suitable for medium sized castings
- Mixing ratio in weight: A:B = 100:120
- Handling time at 20°C: 23 minutes*
- De-mold time at 20°C: 12 hours
- Fully hardened (100 gr. at 20°C): 1 day
- Color: clear (UV stabilized)
- Hardness after curing: Shore D 75-80
- Viscosity mixture at 25°C: 100-350 mPa⋅s
- Density: 1.07 g/cm³
*Please note that the values given are based on a 100 gram sample at 20 degrees with a thickness of between 0.5 and 1.5 cm. Please note that PU is sensitive to moisture. Therefore, always work in a dry place.
Always use protective gloves and goggles when processing this material. Add the A and B componentvolume to each other (1: 1) or by weight 100:120, and mix the components thoroughly. Pour the mixed product with a constant and thin jet into the mold. try not to entrap air. Excessive heat in castings of more than 15mm thickness can be prevented by pouring several successive layers (allow the layer to set but not harden before casting the next layer). De-mould after the specified time has elapsed. The mechanical properties will develop rapidly, but it is possible to improve the thermal behavior by post-curing the casting for one hour in the mold at a temperature of 60 - 70oC.
It is quite difficult to pour polyurethane completely free of bubbles. You get the best bubble-free result by placing the cast form in a liquid state in a pressure chamber at 4 bar during the entire gel time.
If the B component has become too cold, it will crystallise. In this case, the B component should slowly be heated to about 60°C and left there for a few hours (not over a flame!). Low (ambient) temperatures will result in longer pot life and de-mould times. If you want to use this PU with a new mold made from condensation silicone, you need to post cure the silicone mold first 1-2 hours at 100-140°C(then allow cooling). This prevents reactions between the silicone mold and the PU (stickiness). We highly recommend this crystal clear PU to be used in an addition-curing silicone like the Silicone Plastique or Culinary. Always use this Pu at room temperature and preheat the mold to 40-50°C. Leave the cast to de-air for a few minutes and place the mould back in the oven at 40-50°C. This prevents formation of gas by contact with water in the air.
The Polyurethane Clear 1200 is best stored in a dry place between 18°C and 28°C. Opened packages should be processed as soon as possible to ensure product quality. The shelf life of well-closed containers in the manner indicated is typically 6 months. Crystallization of the B component can usually be remedied by warming the B component slowly for several hours to 60°C.
H226 Flammable liquid and vapour.
H317 May cause an allergic skin reaction.
H336 May cause drowsiness or dizziness.
H412 Harmful to aquatic life with long lasting effects.
P-Code Precautionary Statements
P261: Avoid breathing dust/fumes/gas/mist/vapours/spray.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P301+312: IF SWALLOWED: Call a doctor if you feel unwell.
P302+352: IF ON SKIN: Wash with plenty of water/.
P321: Specific treatment (see instructions on this label).
P330: Rinse mouth.
PBT: This product is not identified as a PBT/vPvB substance.