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
Bayfol® LR 5902 is a latent reactive adhesive film, a so-called thermoset adhesive of a polyurethane (PU) polymer.
The film is designed for low temperature activation bonding on wide range of substrates, supplied on a silicone paper as release liner.
Color: natural, black / other colors on request.
Typical Values
| Property | Value | Unit of measurement | Method |
|---|---|---|---|
| Density | approx.1,1 | g/cm³ | 1) |
| Weight per unit area | 55 or 85 | g/m² | |
| Melting temperature of the PU polymer | approx. 45 2) | °C | DSC |
| Glass transition temperature of the PU polymer | approx. -50 2) | °C | DSC |
| Curing temperature | from about 35 | °C | determined empirically |
| Softening range of the cross linked film | 180 - 200 | °C | TMA - internal method |
* These values provide general information and are not part of the product specification.
Regarding thickness and width, certain restrictions may apply. MD/CD values may vary depending on thickness and
width. Our „General Conditions of Sale“ also apply.
1) Calculated based on information by raw material suppliers and the film ’s composition.
2) Based on data by raw material supplier, not measured on film sample.
Storage
- Storage in original and sealed Covestro packaging
- Preferred storage temperature 15°C - 25°C
- Maximum storage / shipping temperature 35°C
- Do not store the film in the vicinity of heaters, radiators or any other heat source
- Direct sunlight should be avoided
Storage time
- Shelf life from date of production 12 months
Processing
Special characteristics:
- Non-blocking / non-tacky at room temperature
- Low temperature activation and easy processing as film substrate
- Strong and irreversible bonding on a range of materials like PVC, ABS, PA, PC, wood, lacquers, textiles and metals
- High durability after heat activation, high peel and shear strenght
- Solvent free adhesive film, forms cross-linked bonds between molecules
- Constant and smooth film thickness
Recommended processing:
- Processing temperature (bond line temperature): >90°C
- Pressure: >1 bar
- The processing parameters have to be adapted to the individual substrates and the used equipment. Processing time depends on the substrates thickness and their thermal capacity and conductivity.
Remark:
The recommended bonding conditions vary depending on the machinery, fabric, substrate and application. Before production, the optimal bonding conditions should be determined for each application.
At temperatures >35°C the cross linking reaction may start already. From 45°C the polymer melts and the film will be sticky.
The cross linking of the polymer improves the bond strength, the heat resistance of the bond as well as the chemical and
hydrolysis resistance of the bond line. The crosslinking reaction is typically finished within 24 hours after the bonding
process.
During processing the uncovered film must not be heated to temperatures above 70°C. Do not breathe fumes!
Please pay attention to the safety recommendations.
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. Values may be affected by the design of the mold/die, the processing conditions and coloring/pigmentation of the product. Unless specified to the contrary, the property values given have been established on standardized test specimens at room temperature.
Contact
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
