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ISO 19001 Desmodur N 3900 For Plastics Coating

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ISO 19001 Desmodur N 3900 For Plastics Coating

ISO 19001 Desmodur N 3900 For Plastics Coating
ISO 19001 Desmodur N 3900 For Plastics Coating ISO 19001 Desmodur N 3900 For Plastics Coating ISO 19001 Desmodur N 3900 For Plastics Coating

Large Image :  ISO 19001 Desmodur N 3900 For Plastics Coating

Product Details:
Place of Origin: CHINA
Brand Name: COVESTRO
Certification: ISO 14001, ISO 19001
Model Number: N3900
Payment & Shipping Terms:
Minimum Order Quantity: 200KG
Packaging Details: 200kg/drum
Delivery Time: 7 days after order confirmed
Payment Terms: L/C, T/T
Supply Ability: More than 20000 tons per year

ISO 19001 Desmodur N 3900 For Plastics Coating

Model: N3900 Desmodur® N 3400 Is Used Primarily As A Reactive Thinner Or As A Hardener Component For: 23.5± 0.5
Viscosity At 23 °C: 730 ±100 Equivalent Weight: 179
Flash Point: 203 Density At 20 °C: 1.15
High Light:

ISO 19001 Desmodur N 3900


Plastics Coating Desmodur N 3900



1. Characterization

Aliphatic polyisocyanate (HDI trimer).

As the hardener component for lightfast polyurethane coating systems.


2. Specification

Property Value Unit of measurement Method
NCO content

23.5 ± 0.5

% DIN EN ISO 11 909
Viscosity at 23 °C

730 ± 100

mPa·s DIN EN ISO 3219/A.3
Color value (Hazen) ≤ 40   DIN EN 1557
Monomeric HDI < 0.25 % DIN EN ISO 10 283
Equivalent weight approx. 179    
Flash point approx. 203 °C DIN 22 719
Density at 20 °C approx. 1.15 g/ml DIN EN ISO 2811


3. Solubility / thinnability

Desmodur® N 3900 is compatible with the following solvents: ethyl acetate, butyl acetate, PMA, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha® 100 and mixtures thereof. Aliphatic hydrocarbons are not suitable as solvents.

Desmodur® N 3900 should not be thinned below a solids content of 40 % by wt. Prolonged solution storage with a lower solids content may result in turbidity and sedimentation.


4. Compatibility

Desmodur® N 3900 can be mixed with the following Desmodur® and Desmophen® products: Desmodur® N 75, N 100, N 3200, N 3300, N 3390, N 3400, N 3600, and Z 4470;

most polyester-based Desmophen® products such as Desmophen® 670, 680, VP LS 2971, VP LS 2089, VP LS 2107, and with polyacrylates. It is incompatible with Desmophen® 650 and 651.


5.Properties / Applications

Desmodur® N 3900 is used to formulate high-solids systems for automotive refinishing, transportation coating, and plastics coating.


6. Storage

- Storage in original sealed Covestro container.

- Recommended storage temperature: 10 - 30 °C.

- Protect from moisture, heat, and foreign material.

General information: The product is sensitive to moisture and should therefore be stored in tightly sealed containers. Storage at elevated temperatures will lead to an increase in viscosity and a reduction of the NCO content.


7. Different Blend Feature with N3900

Eq.mix ratio 1/0/1 0.75/0.25/1 0.5/0.5/1 0.25/0.75/1 0/1/1
F420 61 45 30 15 0
F520 0 16 31 46 60
N3900 39 39 39 39 40
Total 100 100 100 100 100
Tack Free 38min 30min 1 h 15min 4 h 45min >24h
Through Cure 60min 60min 3 h 9 h >24h
Gel time(100g) 37min 29min 44min 126min 8 h
Pencil hardness HB(14days) HB(14days) HB(14days) HB(14days) HB(14days)
Shore D hardness 80 in 1 day 80 in 1 day 80 in 1 day 80 in 1 day 80 in 3-5 days
Mixed viscosity at 25℃, cps 2038 2420 2775 2220 1528



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