HDI closed Covesro BL 3175 SN

HDI closed Covesro BL 3175 SN



Blocked aliphatic HDI-polyisocyanate. With Desmophen® grades to formulate lightfast one-component polyurethane stoving coatings; as an additive to improve flexibility and adhesion.

Product Types:

  • HDI
  • PIC
  • Aliphatic polyisocyanate
  • Crosslinkers
  • Polyisocyanate
  • Hardeners
  • Polyisocyanurate
  • Isocyanate


Coatings, paints & inks:

Solventborne, Flexible, Thermally resistant, Elastic

General Characterization:

Blocked, aliphatic polyisocyanate based on HDI.

In combination with Desmophen® grades to formulate lightfast, one-component polyurethane stoving coatings; as an additive in conventional stoving systems to improve flexibility and adhesion.

Storage Conditions:

– 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.


Property NameTest MethodUnitValue
Equivalent weightapprox. 380
Density at 20 °CDIN EN ISO 2811g/mlapprox. 1.06
Flash pointDIN 53 213/1°Capprox. 45
Blocked NCO content%approx. 11.1
Viscosity at 25 °CM014-ISO 3219/A.3mPa*sapprox. 2,800




Property NameTest MethodUnitValue
Color value (Hazen)M017-EN 1557≤ 60
Viscosity at 23 °CM014-ISO 3219/A.3mPa*s3,300 ± 400
Free NCO content, modifiedM105-ISO 11909%≤ 0.2
Non-volatile content (0.2 g / 60 min / 80 °C)M020-ISO 3251%75 ± 2


Storage and Transportation:

STORAGE: It is recommended to store in a dry and cool area with proper ventilation.


200KG/drum Please fasten the packaging cover as soon as possible after original packaging to prevent the mixing of other substances such as moisture and other substances that may affect the performance of the product. Do not inhale dust, avoid skin and mucous membrane contact. Smoking, eating and drinking are prohibited in the workplace. After work, shower and change clothes. Store contaminated clothes separately and reuse them after washing. Maintain good hygiene practices.

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