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
Desmodur BL 3575/1 MPA/SN is a blocked aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI). It is suitable for use in combination with Desmophen® grades to formulate lightfast, one-component stoving polyurethane coatings.
Applications
Desmodur BL 3575/1 MPA/SN is combined with Desmophen types to formulate light-fast, weather-stable, chemical- and highly heat-resistant, one-component polyurethane stoving coatings.The main applications are in topcoats for automotive OEM and in high-grade industrial finishes (can-/coil-coatings, etc.).Compared with Desmodur BL 3175 SN, Desmodur BL 3575/1 MPA/SN allows a reduction in the stoving temperature of approximately 10°C, without any decrease in solvent and chemical resistance.Typical stoving conditions without catalyst are, e.g. for combinations with Desmophen T 1665: 160°C for 20 minutes, 170°C for 10 minutes, or 190°C for 5 minutes.The use of a metal catalyst can significantly reduce the stoving temperatures. Used in the coil coating systems, Desmodur BL 3575/1 MPA/SN achieves sufficient crosslinking without the addition of a catalyst from a peak metal temperature of approx. 232°C and above.As with any product, use of Desmodur BL 3575/1 MPA/SN in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.
Form supplied
Form supplied is approximately 75% in solvent naphtha 100/1-methoxypropylacetate-2 (17 : 8).
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.2g/60 min/80°C) | 75 ± 2 | % | |
| Viscosity | at 23° C | 3,600 ± 1,000 | mPa∙s | |
| Hazen color value | ≤ 100 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 400 | |||
| Blocked NCO content | approx. 10,5 | % | ||
| Density | at 20° C | approx. 1,1 | g/ml | |
| Flash point | approx. 53 | °C |
Solubility / thinnability
Desmodur BL 3575/1 MPA/SN can be thinned with esters, ketones and aromatic hydrocarbons such as: ethyl acetate, butyl acetate, methoxypropylacetate, acetone, methyl isobutyl ketone, toluene, xylene, solvent naphtha 100, 150 and mixtures thereof.Generally speaking, it has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Aliphatic hydrocarbons are unsuitable as solvents.Desmodur BL 3575/1 MPA/SN should not be thinned below a solids content of 40%, with solvent naphtha to not less than 60%. Prolonged storage of a solution with a lower binder content may result in turbidity and sedimentation.
Compatibility
Given equivalent crosslinking, Desmodur BL 3575/1 MPA/SN polyisocyanate exhibits good compatibility with polyols such as Desmophen T 1665. The combinations should always be tested for their compatibility.
Storage
Desmodur BL 3575/1 MPA/SN should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. 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. Recommended storage temperature is 0º-30ºC.
Storage time
Desmodur BL 3575/1 MPA/SN has a shelf life of nine months from date of receipt at customer, provided the material is stored in sealed original containers at the recommended storage temperature.
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 .
