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
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
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
These values are provided as typical data only and do not constitute binding specifications or warranted performance, unless explicitly agreed by Covestro in writing. Performance may vary depending on factors including, but not limited to, mold/die, processing conditions and coloring/pigmentation. Unless otherwise stated, values are based on standardized test specimens at room temperature.
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 .
