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 HDI.In combination with Desmophen® grades to formulate lightfast, one-component polyurethane stoving coatings; as an additive in conventional stoving systems to improve flexibility and adhesion.
Applications
Desmodur® BL 3175 SN can be used as the hardener in colorfast and weather-stable, one-component polyurethane coatings. The stoving temperature can be significantly reduced by the addition of a catalyst, e.g. dibutyltin dilaurate (DBTL), without reducing the storage stability.The product is used in high-grade industrial finishes (electrical appliances, small components, can coatings, coil coatings, etc.) and in primer surfacers and topcoats for automative finishing. Desmodur® BL 3175 SN can also be used as an additive in conventional stoving systems to improve the flexibility and adhesion. Possible stoving cycles for Desmodur® BL 3175 SN combined with Desmophen® 651 are:without catalyst with catalyst Depending on the co-reactant used and the stoving time, yellowing may occur at temperatures above 160 °C. Used in coil coating systems, Desmodur® BL 3175 SN crosslinks sufficiently without the addition of DBTL from a peak metal temperature of approx. 241 °C and above. With an addition of 1 % DBTL, calculated on solid resin, the same result is achieved from approx. 224 °C peak metal temperature.
Form supplied
approx. 75 % in solvent naphtha® 100
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.2 g / 60 min / 80 °C) | 75 ± 2 | % | M020-ISO 3251 |
| Viscosity at 23 °C | 3,300 ± 400 | mPa*s | M014-ISO 3219/A.3 | |
| Color value (Hazen) | ≤ 60 | M017-EN 1557 | ||
| Free NCO content, | modified | ≤ 0,2 | % | M105-ISO 11909 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Blocked NCO content | approx. 11,1 | % | ||
| Viscosity at 25 °C | approx. 2,800 | mPa*s | M014-ISO 3219/A.3 | |
| Equivalent weight | approx. 380 | |||
| Flash point | approx. 45 | °C | DIN 53 213/1 | |
| Density at 20 °C | approx. 1,06 | g/ml | DIN EN ISO 2811 |
Solubility / thinnability
Generally speaking, Desmodur® BL 3175 SN has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Desmodur® BL 3175 SN can be thinned to a solids content of 40 % by wt. with ketones, esters, ether esters and aromatics. It can be thinned to a solids content of 60 % by wt. with mixtures of higher boiling aromatics such as solvent naphtha® 100 and 150. Aliphatic hydrocarbons cannot be used.
Compatibility
Given equivalent crosslinking (NCO/OH = 1.0), Desmodur® BL 3175 SN is generally compatible with Desmophen® 651, 670, 680, 690, RD 181, A 160, various polyacrylates and with Desmophen® T 1665. It can also be combined with various plasticisers, e.g. phosphoric acid, sulphonic acid, adipic acid and phthalic acid esters. 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: 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 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 .
