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
Applications
Bayflex® 5253 is a moldable microcellular polyurethane foam, designed for high production molded gasket applications such as radial seal filters.
The formulated system is supplied with two liquid components. Mondur® 7000 is the component A which is a prepolymer of diphenylmethane diisocyanate (MDI), and component B Bayflex® 5253 is a polyether polyol system.Note: The phase of component B (polyol) is separated when left at rest and must be thoroughly mixed by mechanical means before use. As with other product, the user must pre-test the Bayflex® 5253 system for the application in question (including field test, etc).
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Material Temperature | 30 - 40 | °C | ||
| POLYOL | ||||
| Appearance | Black liquid | |||
| Mix Ratio by Weigh | Polyol/Isocyanate | 100/48 | ||
| Mold temperature | 53 ± 5 | °C | ||
| No. OH | 138 | mg KOH/g | ||
| Cream time | 26 ± 3 | seg | ||
| Dynamic Viscosity | 25 °C | 1200 | mPa.S | |
| Rise time | 78 ± 4 | seg | ||
| Specific gravity | approx. 1,05 | |||
| Free rise density | 255 | kg/m3 | ||
| Water content | max. 0,3 | Wt. % |
Storage
Avoid moisture contamination during storage, handling, and processing. For both components, pad containers with either nitrogen or dry air (desiccant cartridge or air dryer at -40°F dew point). Store poly component B from 18 °C to 30 °C (65°F to 85°F). Mix poly component to a homogenous state before use and before removing any material from container. For optimum shelf life, the recommended storage temperature for the isocyanate component is 20 °C to 35 °C (68°F to 95°F). Do not expose isocyanate component to lower temperatures – freezing may occur.
Processing
Mix Bayflex® 5253 poly before use and before removing any material from container. Nucleating the poly component will typically improve the quality of the foam. Cycle time depends on mold and curing oven temperature. Tooling with good heat transfer characteristics, such as milled aluminum, can reduce the cycle time. Use a high-quality, properly applied, wax or silicone release agent to prevent cured foam from sticking to mold surfaces. If a water-based release agent is used, sufficient time must be allowed for the mold surface to be completely dry prior to foam dispense.
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.
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 .
