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
Applications
DESMODUR 44 MC FLAKES is a monomeric diphenylmethane-4,4'-diisocyanate with a molecular weight of 250 g/mol. At room temperature the product takes the form of a white to light yellow solid.It can be used in conjunction with polyols for the production of polyurethane products.
Sampling
Moisture access should be prevented when taking product samples.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| 4,4'-isomer content | min. 98,2 | % by wt. | MDI-01-06 | |
| 2,4'-isomer content | max. 1,8 | % by wt. | MDI-01-06 | |
| Hydrolysable chlorine | 40 - 60 | ppm | MDI-01-04 |
Storage
Storage in original sealed Covestro containers.Recommended storage temperature: < 5 °CProtect from moisture, heat and foreign material.Covestro represents that, for a period of 3 months following the day of shipment as stated in the respective delivery documents, the product will meet the values set forth in section "specification" above provided that the product is stored in full compliance with the storage conditions and is otherwise handled appropriately.The lapse of this period does not necessarily mean that the product no longer meets specifications. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications. Covestro does not make any representation regarding the product after the period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications after the period.Like all isocyanates, DESMODUR 44 MC FLAKES is sensitive to moisture and reacts with water to form insoluble urea derivatives and carbon dioxide. The generation of carbon dioxide in sealed containers can lead to a dangerous build-up of pressure. Contact with air, especially if accompanied by simultaneous exposure to light, accelerates yellowing ofDESMODUR 44 MC FLAKES. It is therefore advisable to store liquid DESMODUR 44 MC FLAKES under dry nitrogen. Yellowing generally has no effect on the product's processing behaviour, however.DESMODUR 44 MC FLAKES is sensitive to heat and likely to dimerization (uretdione formation).The solid product dimerizes more rapidly at room temperature than the liquid product stored at 43 °C. Crystallized DESMODUR 44 MC FLAKES should therefore be stored at temperatures below 5 °C and melted rapidly but gently before use. Although the rate of dimerization decreases as the temperature drops, storage stability is still limited even at temperatures below 5 °C.
Processing
It must be ensured that the containers - including empty tanks and containers - are kept sealed.Above all, contact with water must be prevented as it reacts withDESMODUR 44 MC FLAKES to form polyureas and carbon dioxide. During storage, sample withdrawal, transfer and processing ofDESMODUR 44 MC FLAKES, the ingress of water in any form (damp containers, aqueous solvents, moist air) must be prevented as otherwise the formation of carbon dioxide may cause a dangerous increase in pressure in the tanks and containers. Furthermore, the formation of polyureas inDESMODUR 44 MC FLAKES may cause turbidity and possibly solid deposits which may then block filters, pumps and pipelines.
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 .
