* These values provide general information and are not part of the product specification.
Product description
Desmodur WP 260 dicyclohexylmethane diisocyanate (HMDI)-terminated polyether prepolymer that is based on polypropylene ether glycol (PPG).It is used in the formulation of two-component elastomer and binder systems.
Applications
Polyurethanes from Desmodur® WP 260 prepolymer can be made optically clear, light-stable, and weather-resistant. They can range from rigid to flexible depending on the coreactant used.
Typical uses include tooling resins, potting and encapsulation, and decorative applications. The material's low viscosity allows for easy production of complex parts with good surface definition.
As with any product, use of the Desmodur® WP 260 prepolymer 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 | 25.8 - 27.0 | % | M105 - ISO 11909 | |
| Dynamic viscosity | 25 °C | ≤ 500 | mPa·s | M014 - ISO 3219/A.3 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | at 25° C | Colorless to yellow liquid | ||
| Specific gravity | at 25° C | 1.08 | ||
| Flash point | PMCC | 187 | °C |
Storage
Desmodur® WP 260 should be stored in tightly sealed original containers and protected from contamination with moisture and other foreign substances, which can adversely affect processing. It will react slowly with water to form CO2 gas, which may cause sealed containers to expand and rupture. Partially filled containers should be blanketed with dry nitrogen. Recommended storage temperature is 25º-50ºC (77º-122ºF).
If Desmodur® WP 260 prepolymer is stored for prolonged periods at or below 25°C (77ºF), crystallization and settling may occur. If crystals do form, they can be melted with moderate, indirect heat (40°– 50°C / 104º-122ºF) in a well-ventilated oven for the minimum time necessary to render the prepolymer clear. When the crystals are melted, the prepolymer should be agitated by rolling the container or stirring until the contents are homogeneous. Since the heated Desmodur® WP 260 prepolymer will generate vapors more rapidly than the prepolymer at 25°C (77°F), be sure to follow the precautions listed on the Safety Data Sheet in Section 8 (Exposure Controls/Personal Protection) when opening a heated container of Desmodur® WP 260 prepolymer.
Storage time
Covestro certifies that the product meets its specifications until the expiry date stated on the Certificate of Analysis, provided it has been stored and handled in accordance with Covestro’s specified conditions. Unless otherwise indicated, the expiry date is 6 months after quality control release. After expiry, product performance is not assured; customers are responsible for retesting material before use. Covestro makes no representations and assumes no liability for the product after the expiry date.
Health and Safety Information
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.
Important
Desmodur® is a registered trademark of the Covestro Group.
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.
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 .
