Before working with this product, you must read and become familiar with the available information regarding its risks, proper use, and safe handling. This information is provided in various formats, including the current Safety Data Sheet (SDS) and product label. SDS can be accessed via the following link:
Safety Data Sheets (SDS) for Covestro products | Covestro
For further questions, please use the contact information provided on this technical data sheet.
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
Responsibility and Liability
The use of Covestro products, technical assistance, and information (regardless of how provided) is outside Covestro’s control and is solely the responsibility of the customer. The customer must conduct adequate testing to determine the suitability of products for its intended use, including but not limited to technical, health, safety, and environmental aspects. Unless otherwise agreed in writing, all products are sold exclusively under Covestro’s standard conditions of sale, which prevail in case of conflict and are available upon request.
The terms and conditions of sale and delivery are available via the following link:
https://order.covestro.com/covestrostorefront/saleConditions
All information is provided “as is” without warranties, express or implied, including merchantability or fitness for a particular purpose, and is subject to change without notice. To the maximum extent permitted by law, Covestro disclaims, and the customer assumes all liability for losses, damages, or claims arising out of use of Covestro products, technical assistance, or information. Any statement or recommendation not expressly contained in Covestro documentation is unauthorized and shall not bind Covestro. Nothing herein shall be construed as encouraging or recommending the use of any product in conflict with any claim of any patent. No license is implied or in fact granted under the claims of any patent.
Restrictions on Regulated Applications
This product is not intended for use in regulated applications such as agriculture, cosmetics, drinking water contact, food contact, medical products (e.g., medical devices), toys, or similar uses subject to specific regulatory requirements. Prior written approval from Covestro is required before this product may be used in any regulated application. The customer is solely responsible for ensuring compliance with all applicable laws and determining product suitability. Covestro disclaims all liability and warranties for unauthorized regulated uses.
Trial or development Product
This product is provided on a trial basis only. Hazard and performance information may be incomplete and may be updated as additional data becomes available. No assurances are given regarding conformity, processability, or long-term performance. Use of this product is at the sole responsibility and risk of the customer. All warranties, express or implied, are disclaimed. Continued supply is not guaranteed and may be discontinued without notice. Covestro accepts no liability for damages or losses arising from the use of this trial product.
Typical Value
The values provided are typical only and do not represent binding specifications. Unless expressly confirmed in a written contract, these values are not part of the contractual quality agreement and must not be relied upon as a warranty or guarantee of product performance.
Sample
Samples provided by Covestro are intended solely for evaluation and testing purposes by the customer and may not be used in commercial applications, resold, transferred to third parties (except qualified testing service providers acting on behalf of the customer), reverse engineered, modified, or used in any manner not explicitly authorized in writing by Covestro. Samples are provided ‘as-is’ without any warranties, express or implied, including fitness for a particular purpose. Customers are solely responsible for ensuring safe handling, regulatory compliance, and suitability of the material for their intended evaluations. Covestro disclaims all liability for damages or losses arising from the use of samples.
Contact Information
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
