Polurea 20 A / Polyurethane Casting System Flexible A20
PLEASE NOTE: Since August 2023, polyurethane with a diisocyanate content of more than 0.1% may only be used in companies where employees have completed the required training courses.
Companies can register for an online training via THIS link.
You can also read more information here .
This Polyurethane is perfect for making stretchable, tear-resistant molds for plaster, cement and concrete.
A polyurethane casting system consisting of an A and B component. This casting system is characterized by its quality and ease of use. The system is perfect for small flexible castings and tear-resistant molds. Polyurethane is usually more resistant to wear than silicone, but is more sensitive to UV and temperature.
- Amber colored two-piece system
- Permanently elastic
- Can be poured up to a layer thickness of 60 mm. Please pour only a small volume if you want to work that thick!
- Can be demolded after 15 to 18 hours
- Good tear resistance and high elongation
Technical data
- Mixing ratio by weight: A:B = 100:50
- Processing time at 25°C*: 28-34 minutes
- De-moulding time at 25°C: 15-18 hours
- Density: 1.05 g/cm³
- Linear shrinkage: <0.1%
- Stretch: 1000%
- Hardness: Shore A 18-22
*For 100 grams. Larger quantities and higher temperatures result in a much shorter processing time. Do not process too much material at once!
Processing
Stir/shake both components in their original packaging well before use, to distribute the fillers well. Only process the PU when it is at room temperature (20 to 25°C). Work in a dry room at room temperature. Do not use wooden spatulas. Process the product in a room above 15°C.
Pour components A and B together and mix thoroughly. Pour the mixed product into the mould at a constant rate, taking care not to entrap air. Excessive heat development in castings of more than 20 mm thickness (or large volumes) can be avoided by pouring several successive layers (allowing the layer to harden before pouring the next). Wait until the indicated time has elapsed before demoulding. The thermal and mechanical properties will develop rapidly. Final specifications will only be achieved after 7 days.
Important
The moisture absorbers in these products may settle, requiring remixing before use. This can be accomplished by vigorously shaking the packaging before use.
The less filler you add, the greater the heat development of the casting and the less thick you can pour in one go. Use a mixing bucket with a large surface area to maximize processing time.
The mixing ratio is very important. With a deviation of more than 3% you cannot achieve the given specifications. Therefore, especially with small quantities, use a very precise scale (gram scale accurate to 2 points after the decimal point).
Shelf life
The polyurethane casting system should be stored in a dry place between 6–28°C the expiration date, which assumes storage within the specified conditions, is indicated on the packaging. Opened packages should be processed as soon as possible to ensure product quality. The normal shelf life is 6 months.
Safety regulations
PU Casting System Flexible A 20 - A component/ Polurea 20 A
H-Code hazard statements
H332 Harmful if inhaled.
H319 Causes serious eye irritation.
H317 May cause an allergic skin reaction
P-Code precautions
Prevention:
P261 Avoid breathing dust/fume/gas/vapours/mist.
P280 Wear protective gloves/clothing and eye/face protection.
P312 Call a POISON CENTER/doctor if you feel unwell.
Action:
P333 + P313 If skin irritation or rash occurs: Get medical advice/attention.
P337 + P313 If eye irritation persists: Get medical advice/attention.
P362 + P364 Take off contaminated clothing and wash it before reuse
P501 Dispose of contents/container in accordance with local regulations.
Special provisions:
EUH204: Contains isocyanates. May produce an allergic reaction.
PU Casting System Flexible A 40 - B component / Polurea 20 B
H-Code hazard statements
H411 Toxic to aquatic life with long lasting effects.
P-Code precautions
Prevention:
P273 Avoid release to the environment.
P391 Collect spilled material.
P501 Dispose of contents/container in accordance with local regulations.
Storage
Product stored in a well-closed container between 15 and 25 o C has a shelf life of at least 1 year.
Product information
EN - Product information Polyurethane Casting System Flexible A40.pdf
EN - Safety data sheet PU casting system Flexible A 20 A component.pdf
EN - Safety data sheet PU casting system Flexible A 20 B component.pdf
