Aliphatic polyisocyanate (highly functional HDI trimer).As the hardener component for lightfast, fast drying polyurethane coating systems.
Product description
Applications
Desmodur® ultra N 3700 is used primarily as a hardener component for lightfast, two-component polyurethane coating systems with high chemical resistance and weather stability, very good gloss retention and outstanding mechanical properties. Preferred coreactants are polyacrylate or polyester polyols.The primary field of application for coating systems based on Desmodur® ultra N 3700 are air and heat-drying automotive OEM, automotive refinishing and transportation coatings, as well as industrial coatings and coatings for plastics.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 20,0 ± 1,0 | % | M105-ISO 11909 | |
| Viscosity at 23 °C | 16,000 ± 4,000 | mPa*s | M014-ISO 3219/A.3 | |
| Color value (Hazen) | ≤ 80 | M017-EN 1557 | ||
| Monomeric HDI | < 0,1 | % | M106-ISO 10283 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Viscosity at 25 °C | approx. 13,000 | mPa*s | DIN EN ISO 3219/A.3 | |
| Equivalent weight | approx. 210 | |||
| Flash point | approx. 247 | °C | DIN EN 22 719 | |
| Density at 20 °C | approx. 1,17 | g/ml | DIN EN ISO 2811 |
Solubility / thinnability
Desmodur® ultra N 3700 is reducible with esters, ketones and aromatic hydrocarbons such as: ethyl acetate, butyl acetate, methoxypropylacetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha® 100 and mixtures thereof. Compatibility with the listed solvents is generally good but the storage stability of the respective solutions should be tested. Only PU grade solvents should be used (max. 0.05 % water, free of reactive groups like hydroxyl or amino groups). Aliphatic hydrocarbons are unsuitable as solvents. Desmodur® ultra N 3700 should not be thinned to less than 40 % non-volatile content. Prolonged storage of a solution with lower binder content may result in turbidity and sedimentation.
Compatibility
Desmodur® ultra N 3700 can generally be blended with the following products: aliphatic polyisocyanates such as Desmodur® N 100, N 75, N 3200, ultra N 3300, N 3400, ultra N 3600 and Desmodur® ultra Z 4470; aromatic polyisocyanates such as Desmodur® L/ultra L, HL and IL/ultra IL; polyester polyols such as Desmophen® 670 as well as polyacrylates.. The compatibility of the combinations used in the formulation should always be tested, however. Desmodur® ultra N 3700 is incompatible with branched polyester polyols such as Desmophen® 651 and polyether polyols such as Desmophen® 1380 BT.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 0 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture. 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.
Health and Safety Information
Before working with this product, you must read and become familiar with the available information on its risks, proper use, and handling. Information is available in several forms, e.g., in particular in the currently valid safety data sheets and product labels. For further information contact your Covestro representative.
Disclaimer
General
The manner in which you use our products, technical assistance and information (whether verbal, written or by way of production evaluations), including any suggested formulations and recommendations, are beyond our control. Therefore, it is imperative that you test our products to determine suitability for your processing and intended uses. Your analysis must at least include testing to determine suitability from a technical, health, safety, and environmental and regulatory standpoint. Such testing has not necessarily been done by Covestro, and Covestro has not obtained any approvals or licenses for a particular use or application of the product.
Unless we otherwise agree in writing, all products are sold strictly pursuant to the terms of our standard conditions of sale which are available upon request.
All information and including technical assistance is given without warranty or guarantee and is subject to change without notice. It is expressly understood and agreed by you that you assume and hereby expressly release indemnify us and hold us harmless from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance, and information. Any statement or recommendation not contained herein is unauthorized and shall not bind us. Nothing herein shall be construed as a recommendation to use any product in conflict with any claim of any patent relative to any material or its use. No license is implied or in fact granted under the claims of any patent.
Non Medical and non Food Contact
This product is not designated for the manufacture of a medical device or of intermediate products for medical devices (1). This product is also not designated for other specifically regulated applications (e.g. including cosmetics, plant protection, fertilisers, plant strengtheners, food processing, food contact and others). If the intended use of the product is for the manufacture of a medical device or of intermediate products for medical devices or for other specifically regulated applications Covestro must be contacted in advance to provide its agreement to sell such product for such purpose. Nonetheless, any determination as to whether a product is appropriate for use in a medical device or intermediate products for medical devices, for Food Contact products or cosmetic applications must be made solely by the purchaser of the product without relying upon any representations by Covestro.
1) Please see the Guidance on Use of Covestro Products in a Medical Application document.
Sample
Any samples provided by Covestro are for testing purposes only and not for commercial use.
Typical value
These values are typical values only. Unless explicitly agreed in written form, they do not constitute a binding material specification or warranted values
Contact
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
