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
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
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 .
