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 75 BA/X is an aliphatic polyisocyanate resin based on hexamethylene diisocyanate (HDI) and dissolved in n-butyl acetate and xylene (1:1).
Applications
Desmodur N 75 BA/X aliphatic polyisocyanate is recommended for use in two-component clear and pigmented interior and exterior finishes. Coatings based on Desmodur N 75 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 75 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 75 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 75 BA/X, dibutyltin dilaurate should be added to the formulation at the level of 0.005–0.01% based on resin solids. Other catalysts which can be used effectively are Desmorapid PP (up to 0.5%) or, 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 75 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 75 BA/X is used alone in a moisture-curing coating. As with any product, use of Desmodur N 75 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 |
|---|---|---|---|---|
| NCO content | 16,5 ± 0,3 | % | ||
| Viscosity | at 25°C | 150 ± 60 | mPa*s | |
| Hazen color value | max. 60 | |||
| Monomeric HDI | max. 0,5 | % | ||
| Non-volatile content | 75 ± 1 | % |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | Clear, slightlyyellow liquid | |||
| Flash point | (Setaflash) | 23 | °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 | Ib. |
Solubility / thinnability
Desmodur N 75 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 75 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 75 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 75 BA/X polyisocyanate.
Compatibility
Desmodur N 75 BA/X is compatible with a variety of other Desmodur polyisocyanates such as Desmodur N 3200, N 3390A BA/SN, Z 4470, HL, and IL, as well as the various Desmodur L aromatic polyisocyanates. Generally, good compatibility is observed with most polyesters, hydroxyl-functional acrylics and polyethers.
Storage
Desmodur N 75 BA/X polyisocyanate should be stored in tightly sealed containers and protected from heat, moisture, and foreign materials. Processability of this product can be adversely affected by contamination. Recommended storage temperatures are -30° to 122°F (-34° to 50°C).
Storage time
Bayer MaterialScience represents that, for a period of six 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 six months period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Bayer MaterialScience recommends to test such a product if it still meets the specifications or the set values.Bayer MaterialScience does not make any representation regarding the product after the lapse of the six months period and Bayer MaterialScience 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 six months period.
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 .
