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 N 75A BA/X is an aliphatic polyisocyanate resin based on hexamethylene diisocyanate (HDI) and dissolved in n-butyl acetate andxylene (1:1).
Applications
Desmodur N 75A BA/X aliphatic polyisocyanate is recommended for use in two-component clear and pigmented interior and exterior finishes. Coatings based on Desmodur N 75A BA/X exhibit excellent gloss retention and weather resistance when formulated with appropriate hydroxyl-functional coreactants. These coatings also have very good resistance to solvents, chemicals, and abrasion.Desmodur N 75A BA/X polyisocyanate is typically used with either polyester or acrylic hydroxyl-functional coreactants. Combinations with acrylic resins are usually fast drying with short dust free times and have relatively low polyisocyanate demand. Using highly functional polyester coreactants with Desmodur N 75A BA/X polyisocyanate results in coatings with improved chemical and abrasion resistance, with a higher level of polyisocyanate required, and drying at a slower rate.To accelerate the drying and ensure adequate performance properties of systems containing Desmodur N 75A BA/X, dibutyltin dilaurate should be added to the formulation at the level of 0.005–0.01% based on resin solids. Other catalysts are effective such as 8% zinc octoate (up to 0.2%), each based on total resin solids of the system. Adding a catalyst reduces the pot life of the formulation and should be evaluated thoroughly.Desmodur N 75A BA/X polyisocyanate is suitable for the formulation of moisture-curing one-component coatings. Up to 1% dibutyltin dilaurate based on resin solids is required whenever Desmodur N 75A BA/X is used alone in a moisture-curing coating. As with any product, use of Desmodur N 75A BA/X polyisocyanate in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Non-volatile content | (0.1 g / 60 min / 105° C | 75 ± 1 | % | |
| NCO content | 16,5 ± 0,3 | % | ||
| Monomeric HDI | ≤ 0,5 | % | ||
| Hazen color value | ≤ 60 | |||
| Viscosity | at 25°C | 150 ± 60 | mPa∙s |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | Clear, slightlyyellow liquid | |||
| Flash point | (Setaflash) | 33 | °C | |
| Equivalent weight | avg. (as supplied) | 255 | ||
| Viscosity | at 23°C | 160 | mPa∙s | |
| Specific gravity | at 25°C | 1,06 | g/cm3 | |
| Weight per Gallon | at 25°C | 8,85 | lb. |
Solubility / thinnability
Desmodur N 75A BA/X polyisocyanate can be diluted with ethyl acetate, butyl acetate, PM acetate, toluene, xylene and most ketones. It is insoluble in aliphatic hydrocarbons. Since Desmodur N 75A BA/X is sensitive to moisture, polyurethane grade solvents with moisture content less that 500 ppm (0.05%) should be used. When diluting Desmodur N 75A BA/X, the solids content should not be lower than 35%; otherwise turbidity and precipitation may occur. Alcohols and amines should not be used, as they react with Desmodur N 75A BA/X polyisocyanate.
Compatibility
Desmodur N 75A BA/X is compatible with a variety of other Desmodur aliphatic polyisocyanates such as Desmodur N 3200, N 3390A BA/SN, Z 4470, as well as the various Desmodur aromatic polyisocyanates such as Desmodur L, HL and IL. Generally, good compatibility is observed with most polyesters, hydroxyl-functional acrylics and polyethers.
Storage
Desmodur N 75A BA/X should be stored in tightly sealed original containers and protected from heat, moisture, and foreign materials. Processability of this product can be adversely affected by contamination. Recommended storage temperature is -34° to 50°C.
Storage time
Desmodur N 75A BA/X has a shelf life of six months from date of receipt at customer, provided the material is stored in sealed original containers at the recommended storage temperature. The lapse of the six 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.
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 .
