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® XP 2556 is a prepolymer containing ether groups and based on diphenylmethane-4,4'-diisocyanate with isomers. It is used both as a one-component moisture-reactive adhesive and in combination with polyols as a two-component system for the formulation of adhesive and coating materials.
Form supplied
Solvent-free, yellowish viscous liquid
Sampling
The ingress of moisture must be avoided.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO content | 15,5 - 16,3 | % | MDI-01-01 | |
| Viscosity at 25 °C | 1,500 - 2,000 | mPa*s | MDI-01-02 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Density at 20 °C | 1,14 | g/cm3 | DIN 51 757 | |
| Vapor pressure at 20 °C | (MDI) | 16 | mbar | EG A4 |
| Flash point | approx. 217 | °C | DIN EN ISO 2719 |
Storage
Recommended storage temperature 10 - 30 °C.Remains stable for six months from delivery when stored in closed containers under the exclusion of moisture.
Processing
At temperatures below 0 °C, crystals of diphenylmethane-4,4´-diisocyanate can form in Desmodur® XP 2556. The product can be rehomogenized by carefully heating the entire contents of the container to max. 70 °C for as briefly as possible.Care must be taken during compounding, transfer, etc. to exclude moisture as even the slightest traces of moisture adversely affect storage stability. It must be ensured that the containers - including those that are empty - are kept sealed. Above all, contact with water must be prevented as it reacts with Desmodur® XP 2556 to form polyureas and carbon dioxide. During storage, sample withdrawal, transfer and processing of Desmodur® XP 2556, the ingress of water in any form (damp containers, aqueous solvents, moist air) must be prevented as otherwise the formation of carbon dioxide may result in a dangerous increase in pressure in the tanks and containers. Furthermore, the formation of polyureas in Desmodur® XP 2556 can cause solids to separate, leading to blockages and malfunctions of the filters, pumps and pipelines of the foaming unit.
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.
Trial or development Product
This is a trial product. Further information, including amended or supplementary data on hazards associated with its use, may be compiled in the future. For this reason no assurances are given as to type conformity, processability, long-term performance characteristics or other production or application parameters. Therefore, the purchaser/user uses the product entirely at his own risk without having been given any warranty or guarantee and agrees that the supplier shall not be liable for any damage, of whatever nature, arising out of such use. Commercialisation and continued supply of this material are not assured. Its supply may be discontinued at any time.
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 .
