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 E 23 A is an aromatic polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI).It is suitable as a binder for the formulation of moisture-curing, one-component coatings and adhesives.It is also suitable as a hardener for hydroxyl-bearing co-reactants.
Applications
Desmodur E 23 A is suitable for use in the formulation of moisture-curing one-component systems which, when thinned with a suitable solvent, can be used as primers and sealers for porous substrates to provide protection against moisture, oil, fuel and other chemicals.It can also be used as a binder in the formulation of synthetic resin mortars. Coatings formulated with Desmodur E 23 A are used as highgrade anti-corrosion systems for steel in civil and hydraulic engineering applications. In combination with suitable Desmophen polyols, Desmodur E 23 A yields tough but flexible, wear-resistant coatings and sealers. Desmodur E 23 A is also suitable for use in the formulation of solvent-free moisture-curing one-component adhesives or in combination with Baycoll to formulate two-component adhesives. These can be used to bond many materials, e.g. wood, metal and plastic.As with any product, use of Desmodur E 23 A 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 a solvent-free liquid.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 16 - 17 | % | ||
| Viscosity | at 25°C | ≤ 1,600 | mPa∙s |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | 247 - 263 | |||
| Flash point | > 193 | °C | ||
| Density | at 20°C | approx. 1,13 | g/cm3 |
Solubility / thinnability
In general, Desmodur E 23 A has good compatibility with ethyl acetate, butyl acetate, 1-methoxypropylacetate-2, xylene, and Aromic 100.However, the solutions formed must be tested for their storage stability.Prolonged storage of a solution with low binder content may result in turbidity and sedimentation. Only PU grade solvents should be used (< 0.05% water). The solvent should not contain reactive groups.
Compatibility
In general, Desmodur E 23 A is compatible with Desmophen®/Baycoll® polyols, with other Desmodur products and with flexibilizers.
Storage
Desmodur E 23 A should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture and should therefore be stored in its sealed original containers. Storage at high temperatures will lead to an increase in viscosity and a reduction of the NCO content. Recommended storage temperature is 18o - 30oC.
Storage time
Desmodur E 23 A 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.
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 .
