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
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
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 .
