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.
Product description
Blocked, aliphatic polyisocyanate based on IPDI.In combination with polyol components to formulate lightfast one-component stoving coatings.
Applications
Desmodur® BL 4265 SN can be combined with suitable, preferably flexible, Desmophen® grades to formulate one-component polyuethane stoving coatings which are lightfast, weather-stable and resistant to chemicals. These are used for high-grade industrial finishing and coil coating. The stoving temperature can be significantly decreased by the addition of a catalyst, e.g. dibutyltin dilaurate (DBTL), without reducing the storage stability. Desmodur® BL 4265 SN can also be used as an additive in conventional stoving systems to improve their hardness, weather stability and resistance to chemicals.Possible stoving conditions for Desmodur® BL 4265 SN combined with, for example, Desmophen® A 365/670 (1 : 1) are: Used in coil coating systems, Desmodur® BL 4265 SN crosslinks sufficiently without the addition of DBTL from a peak metal temperature of approx. 241 °C. With an addition of 1 % DBTL, calculated on solid resin, the same result is achieved from approx. 210 °C peak metal temperature.
Form supplied
65 % in solvent naphtha® 100
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.2 g/60 min/125 °C) | 65 ± 2 | % | M020-ISO 3251 |
| Viscosity at 23 °C | 11,000 ± 3,000 | mPa*s | M014-ISO 3219/A.3 | |
| Color value (Hazen) | ≤ 100 | M017-EN 1557 | ||
| Free NCO content | (modified) | < 0,2 | % | M105-ISO 11909 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Blocked NCO content | approx. 8,1 | % | ||
| Viscosity at 25 °C | approx. 10,500 | mPa*s | M014-ISO 3219/A.3 | |
| Equivalent weight | approx. 520 | |||
| Flash point | approx. 47 | °C | DIN 53 213/1 | |
| Density at 20 °C | approx. 1,03 | g/ml | DIN EN ISO 2811 |
Solubility / thinnability
Generally speaking, Desmodur® BL 4265 SN has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability.Desmodur® BL 4265 SN can be thinned to a solids content of 40 % with ketones, esters, ether esters, aromatic hydrocarbons and solvent naphtha® 100, 150 and 200. It has only limited thinnability with aliphatic hydrocarbons.
Compatibility
Given equivalent crosslinking, Desmodur® BL 4265 SN is generally compatible with Desmophen® 651, 670, 680, 690, 800, 1100, 1300, RD 181, with various alkyd resins, polyacrylates and polyesters, e.g. Desmophen® T 1665. The combinations should always be tested for their compatibility.
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 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.
Storage time
Covestro represents that, for a period of nine 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 nine 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 nine 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 nine months period.
Health and Safety Information
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, food 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.
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 .
