Covestro certifies that the product meets specifications for 9 months from the date of shipment, provided it is stored and handled in accordance with the conditions specified in the ‘Storage’ section. After this period, product performance is not assured; Customers are responsible for retesting material before use. Covestro assumes no liability for product performance after 9 months.
Product description
Low-viscosity, aliphatic polyisocyanate resin based on hexamethylene diisocyanate.As the hardener for weather-stable coating systems.
Applications
Desmodur® ultra N 3900 is used to formulate high-solids systems for automotive refinishing, transportation coating and plastics coating.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 23.0 - 24.0 | % | M105 - ISO 11909 | |
| Monomer content | < 0.10 | % | M106 - ISO 10283 | |
| Dynamic viscosity | 630 - 830 | mPa·s | M014 - ISO 3219/A.3 | |
| Color | ≤ 40 | M017 - EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Density | 20 °C | 1.15 | g/cm³ | DIN 51757 |
| Flash point | 1.01 hPa | 203 | °C | DIN EN 22719 |
Solubility / thinnability
Desmodur® ultra N 3900 is compatible with the following solvents:
ethyl acetate, butyl acetate, 1-methoxypropylacetate-2, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha® 100 and mixtures thereof.
Aliphatic hydrocarbons are not suitable as solvents.
Desmodur® ultra N 3900 should not be thinned to below a solids content of 40 % by wt. Prolonged storage of a solution with a lower solids content may result in turbidity and sedimentation.
Compatibility
Desmodur® ultra N 3900 can be mixed with the following Desmodur® and Desmophen® products:
Desmodur® N 75, N 100, N 3200, ultra N 3300, ultra N 3390, N 3400, ultra N 3600 and ultra 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.
Storage
- Storage in original sealed Covestro container.
- Recommended storage temperature: {{storageTemperature}}.
- 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
Health and Safety Information
Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
Important
The product is mainly used as a hardener in coating materials or adhesives. The handling of coating materials or adhesives containing reactive polyisocyanates and residual levels of monomeric HDI requires appropriate protective measures (see safety data sheet). They may therefore only be used in industrial or professional applications. They are not suitable for use in do-it-yourself applications.
Disclaimer
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Conditional Use in Regulated Applications
This product may be suitable for use in food contact. However, use in such applications requires prior written approval from Covestro. Legal requirements for such applications vary by country and jurisdiction, and the customer is solely responsible for verifying compliance with all applicable laws and regulations. Without Covestro’s written approval, the product may not be distributed or used for regulated purposes, and Covestro disclaims all liability for such use.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
