Desmodur E 743 is a polyisocyanate prepolymer based on diphenylmethane diisocyanate (MDI).
Product description
Applications
Desmodur E 743 polyisocyanate produces one-component highly resilient, rubbery-like films with an extremely high abrasion resistance. Coatings based on Desmodur E 743 polyisocyanate are resistant to acids and alkalies of medium concentration. Solvents cause swelling of the flexible urethane coating. Desmodur E 743 polyisocyanate is not resistant to yellowing.Desmodur E 743 polyisocyanate is compatible with and is considered to be a suitable flexibilizer for materials based on Desmodur E 28 polyisocyanate. Desmodur E 743 polyisocyanate, when combined with Desmodur E 28 polyisocyanate, may be suitable as a moisture-cure coating for concrete to help protect the substrate against water, oils, or chemicals. Because of the high degree of flexibility, the cured films serve as a bridge over cracks. Desmodur E 743 polyisocyanate can also be used as a binder for aggregates such as rubber granules and sand. Any such application, however, should be thoroughly tested prior to use. As with any product, use of Desmodur E 743 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 | 7,8 - 8,2 | % | ||
| Viscosity | at 25°C | 1,700 - 3,300 | mPa∙s |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Specific gravity | at 20°C | 1,09 | ||
| Flash point | PMCC | 200 | °C | |
| Equivalent weight | avg. (as supplied) | 525 | ||
| Weight per Gallon | at 25°C | 9,0 | lb. | |
| Solids | 100 | Wt. % | ||
| Appearance | Light yellow liquid |
Solubility / thinnability
Desmodur E 743 is readily soluble in esters, ketones, and aromatic hydrocarbons.
Storage
Desmodur E 743 should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture. Recommended storage temperature is 5º-50ºC.
Storage time
Desmodur E 743 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
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.
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 .
