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 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
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 .
