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.
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
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 .
