Polyurethane Casting System A75 Flexible Kit

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Polyurethane Casting System A75 Flexible Kit

This Polyurethane is perfect for flexible castings, and for fixing molds, foundry models, replicas and prototypes.

A polyurethane casting system consisting of an A- and B-component that hardens at room temperature. This casting system is characterized in particular by its quality and ease of use.This PU gives a flexible result that is perfect for small to medium sized castings. PU is usually more resistant to abrasion than silicone, but is more UV and temperature sensitive

Beige colored two-piece system
Designed for fast, flexible precision castings
Can be molded into a layer thickness of 30 mm
De-mouldable after 6 hours ontmalbaar
Good Tear resistance

Tecnical data

Mixing ratio: A:B = 100:40
Processing time at 20°C*: 15 minutes
De-Mould time at 20°C: 6 hours
Density: 1.2 g/cm³
Linear shrinkage: 0.1%
Tensile strength: 7 MPa
Elongation: 450%
Hardness: Shore A 75
Viscosity @20 ^oC: 3.000 cSt

* For 100 gram sample. Larger quantities and higher temperatures result in a much shorter pot life.

Processing

Stir the two components in their original packaging well before use in order to distribute the fillers evenly. Only process the PU when it is at room temperature (20 to 25°C). Work in a dry room at room temperature. Preferably preheat the mold to 40°C. do not use wooden spatulas.

Pour the components together and mix well. Pour the mixed product with a constant flow into the mold, making sure no air is entrapped. Excessive heat in castings of more than 30 mm thickness can be prevented by pouring multiple successive layers (let the layer harden till it is over its exothermal peak before the next layer is poured). Hold the de-moulding until the specified time has elapsed. The thermal and mechanical properties will develop rapidly, but it is possible to improve the thermal behavior by "post curing" the cast for a few hours at a temperature of 60°C.

Important

The dehumidifiers in these products tend to settle out. We therefore recommend aggitating the components before decanting. The less filler you add, the higher the exothermic peak will be. Adding a heat conducting filler will make casting thicker layers possible. Use a mixing vessel with large surface area in order to make a maximum pot life. Adding to much filler might make the product more rigid and brittle.

Durability

The polyurethane casting system should be stored in a dry place between 6-28°C, the expiration date, which is based on storage within the specified conditions, is indicated on the packaging. Opened packages should be processed as quickly as possible to ensure product quality. Normal shelf life is about 6 months.

safety

The products are generally quite safe in use as long as one takes the usual precautions which is common in processing of chemical products. For example, the two components must not come into contact with food or eating utensils. Contact with the skin of one or both components must be avoided. If after cleaning skin stays sensitive contact a docter. Rinse eyes well for 15 minutes in case material gets in the eyes and contact docter. Do not ingest. For further information see Safety Data Sheet.

Other important safety information