Applications
Desmodur® L 75 (A) is suitable for room-temperature crosslinking of adhesives based on Desmocoll® or Baycoll®. These can be used to bond many materials, e.g. wood, metal and plastic. The use of this polyisocyanate increases the resistance of the bonds to heat, oil, plasticisers and many solvents. It ensures good adhesion to many materials, especially plastics. The pale inherent color of Desmodur® L 75 (A) permits its use in bonding transparent plastic films for packaging.
Form supplied
approx. 75 % in ethyl acetate
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 13,3 ± 0,4 | % | M105-ISO 11909 | |
| Non-volatile content | 75,0 ± 2,0 | % | M020-ISO 3251 | |
| Viscosity | (23 °C) | 1,600 ± 400 | mPa*s | M014-ISO 3219/A.3 |
| Color | (Iodine) | ≤ 2 | M017-EN 1557 | |
| Monomer content | < 0,5 | % | M106-ISO 10283 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 315 | |||
| Flash point | approx. 5 | °C | DIN 51755 | |
| Density | at 20 °C | approx. 1,17 | g/ml | DIN EN ISO 2811-3 |
Solubility / thinnability
In general, Desmodur® L 75 (A) has good compatibility with esters such as ethyl acetate, butyl acetate and 1-methoxypropylacetate-2 and aromatic hydrocarbons such as toluene, xylene, Solvesso 100 and Shellsol® A. However, the solutions formed must be tested for their storage stability.The product is not compatible with aliphatics. Alcohols react with Desmodur® L 75 (A) and therefore cannot be used.Prolonged storage of a solution with low binder content may result in turbidity and sedimentation.Only PU grade solvents should be used (< 0.05 % water). The solvent should not contain reactive groups.
Compatibility
In general, Desmodur® L 75 (A) is compatible with many polyesters, polyethers and polyacrylates, as well as with other Desmodur grades.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, heat and foreign material. General information: Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product.
Storage time
Covestro represents that, for a period of six months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately.The lapse of the six months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the six months period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the six months period.
