Applications
Combined with suitable Desmophen® products, Desmodur® PL 350 can be used in the formulation of weather-stable, lightfast, chemically resistant and highly heat-stable one-component polyurethane stoving coatings for use in automotive finishing.Compared with polyisocyanates blocked with butanone oxime, Desmodur® PL 350 allows a reduction in the stoving temperature of approx. 10 °C, with no decrease in solvent and chemical resistance.
Form supplied
approx. 75 % in 1-methoxypropylacetate-2/solvent naphtha® 100, 8 : 17
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.2 g/60 min./80 °C) | 75 ± 2 | % | DIN EN ISO 3251 |
| Viscosity at 23 °C | 4,300 ± 1,500 | mPa*s | DIN EN ISO 3219/A.3 | |
| Color value | ≤ 100 | DIN EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 400 | |||
| Blocked NCO content | approx. 10,5 | % | ||
| Density at 20 °C | approx. 1,10 | g/cm3 | DIN 51 757 | |
| Flash point | approx. 53 | °C | DIN EN ISO 13 736 |
Solubility / thinnability
Generally speaking, Desmodur® PL 350 has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability.Desmodur® PL 350 can be thinned to a solids content of 40 % by wt. with ketones, esters and ether esters.It can also be thinned to 60 % by wt. using higher boiling aromatic mixtures such as solvent naphtha 100 and 150. The product has only limited thinnability with aromatic hydrocarbons. Aliphatic hydrocarbons are unsuitable as diluents.
Compatibility
Generally speaking and given equivalent crosslinking (NCO/OH = 1.0), Desmodur® PL 350 is miscible with Desmophen® 651, 670, 680, 690, 800, 1300, RD 181, T 1665, Setalux® D A 160, A 265, A 365, A 450, A 565, A 575, A 665 and A 870. However, the compatibility of the mixtures must be tested in each individual case.
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.
