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
Aliphatic anionic polyester polyurethane dispersion.As a combination binder in the formulation of highly flexible, water-thinnable, air- and force-drying primers and one-coat finishes for use on plastics.
Applications
Bayhydrol® UH 240 can be used in combination with hydrofunctional resins, preferably Bayhydrol® U XP 2698, Bayhydrol® U 2757 and in the formulation of highly flexible two-component polyurethane top coats (e.g. in soft-feel coating systems). After crosslinking with, e.g. Bayhydur® 3100 force-drying (e.g. 30 - 45 min at 80 °C) yields films with good surface handle and good resistance to abrasion and water. Formulation/applicationSuitable grinding equipment includes sand or bead mills. During grinding the temperature of the mill base should not exceed 40 °C. After formulation the pH of flexible primers based on Bayhydrol® UH 240 is approx. 8. The flexible primers can be applied by conventional spraying methods. CleaningAll equipment should be cleaned immediately after use or left to soak in water. Warm water, alkaline cleaning agents or alkaline isopropyl alcohol are suitable for cleaning.
Form supplied
approx. 40 % in water
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Viscosity at 23 °C,(D = 40 s^(-1) | < 150 | mPa∙s | DIN EN ISO 3219/A.3 | |
| Non-volatile content | (1 g/1 h 125 °C) | 39 - 41 | % | DIN EN ISO 3251 |
| pH | 6 - 8 | DIN ISO 976 | ||
| Mean particle size | max. 210 | nm | photon correlation spectroscopy |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Acid value | approx. 0,5 | mg KOH/g | DIN EN ISO 2114 | |
| Minimum film forming temperature (MFT) | < 0 | °C | DIN ISO 2115 | |
| Density | at 20 °C | approx. 1,1 | g/ml | DIN EN ISO 2811-2 |
| Appearance | milky, cloudy |
Solubility / thinnability
With water.
Compatibility
Bayhydrol® UH 240 is compatible with many acrylic dispersions, polyurethane dispersions and water-thinnable polyesters. Given the many different products available, the compatibility should always be tested.
Storage
- Storage in original sealed Covestro containers. - Recommended storage temperature: 5 - 40 °C. - Protect from frost, heat and foreign material. General information: An increase in viscosity may occur during storage. If the containers are not sealed properly, the evaporation of water will result in the formation of a film which cannot be redispersed. The product is sensitive to frost. Freezing will damage the product irreversibly. Prolonged storage at higher temperatures may result in a decrease of viscosity and/or an increase of average particle size, possibly resulting in sedimentation or coagulation. Contamination with certain bacteria, fungi or algae may render the product unusable.
Storage time
Covestro represents that, for a period of nine 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 nine 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. Covestro does not make any representation regarding the product after the lapse of the nine months period and Covestro 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 nine months period.
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 .
