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Desmodur® BL 4265 SN

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Materialklassen

  • PIC
  • Vernetzer
  • Härter
  • Aliphatisches Polyisocyanat
  • Isocyanat
  • Polyisocyanurat
  • Polyisocyanat

Material

Lacke
hart, thermisch beständig, lösemittelbasiert

Allgemeine Charakterisierung

Desmodur BL 4265 SN is a blocked, aliphatic polyisocyanate based on isophorone diisocyanate (IPDI).
It is suitable for use in combination with polyol components to formulate lightfast one-component stoving coatings.

Lagerungsbedingungen

Desmodur BL 4265 SN should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. Recommended storage temperature is 0º-30ºC.
General Information: The product is sensitive to moisture and should therefore be stored in its sealed original containers. Prolonged storage at temperatures above 25°C results in a deterioration in quality as the product becomes increasingly turbid owing to the formation of a sediment (dimers) that is not readily soluble. For example, storage stability at 40°C is limited to a maximum of 4 months. Storage at too low a temperature results in crystallization which starts at around 15°C. The storage of the crystallized product must be avoided as this promotes the formation of non-meltable dimers. As a result, the product can no longer be fully melted after around three weeks. To prevent crystallization, it must be ensured that the product does not cool to below 20°C.
Upon receipt, samples of the product should be tested for crystallization. If crystallization has occurred during transportation or storage, the product must be remelted immediately. On no account should the temperature during melting (material temperature) exceed 70°C nor should the time needed to reliquefy the product be exceeded as this will greatly promote the formation of non-meltable dimers. It should be ensured that the entire content of the container is remelted and homogenized. The container must then be closed immediately and its content cooled to and kept at the standard storage temperature (20 - 25°C). If the product is in a partially crystallized state for a brief period, there will be no significant effect on the product quality. Only the storage stability may be reduced slightly, i.e. remelted product should be used as soon as possible.

Probenahme

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Verpackungsart

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Technische Eigenschaften & Datenblätter

Name der Eigenschaft Prüfverfahren Einheit Wert
Free NCO content (modified) % < 0.2
Viscosity at 23oC mPa∙s 11,000 ± 3,000
Non-volatile content (0.2 g / 60 min / 125oC) % 65 ± 2
Hazen color value ≤ 100

Name der Eigenschaft Prüfverfahren Einheit Wert
Equivalent weight approx. 520
Blocked NCO content % approx. 8.1
Viscosity at 25° mPa∙s approx. 10,500
Density at 20°C g/ml approx. 1.03
Flash point °C approx. 47

Downloads

Technisches Datenblatt
Sicherheitsdatenblatt
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