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
Dureflex® A4700 is a self-priming, polyether based, low modulus aliphatic thermoplastic polyurethane film/sheet product.
Applications
Dureflex® A4700 was developed as part of a series of optical grade adhesive films. Dureflex® A4700 was specifically developed for the lamination of optically transparent glass-clad polycarbonate. Dureflex® A4700 is also used in acrylic composites CAB and other compatible thermoplastics.
Dureflex® A4700 can be supplied from 15 to 50 mils (0.38 to 1.27 mm) with a specially developed film finish to allow for evacuation of trapped air during press or autoclave bonding. Dureflex® A4700 is supplied with a protective polyethylene interleaf to prevent film-to-film roll blocking, and should be incorporated where a "primerless" lamination is required. As with any product, use of Dureflex® A4700 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.
Potential Applications
• Prison containment glazing
• Retail kiosks
• Hurricane / Vandals glazing
• Zoos
• Computer screens
• Ballistic / Blast / Intrusion
• Vehicle armoring
• Thermoforming
• Residential glazing
• Government / Military
Typical Values
Typical Physical Properties*
| ASTM Test Method | Value, U.S. Units | Value, S.I. Units | |
| Specific Gravity | D-792 | 1.07 | |
| Durometer (Shore A) | D-2240 | 78 | |
| Ultimate Tensile Strength | D-882 | 5,500 psi | 37.9 MPa |
| Ultimate Elongation | D-882 | 500% | 500% |
| 100% Modulus (MD/CD Avg.) | D-882 | 500 psi | 3.4MPa |
| 300% Modulus (MD/CD Avg.) | D-882 | 1,500 psi | 10.3 MPa |
| Tear Resistance (MD/CD Avg.) | D-1004 | 250 pli | 43.8 kN/m |
| Min. Softening Point (TMA onset) | E-2347 | 169ºF | 76ºC |
| Max. Softening Point (TMA endpoint) | E-2347 | 212ºF | 100ºC |
| Appearance | Optically Clear | ||
* These items are provided as general information only. They are approximate values and are not part of the product specifications.
Custom Manufacturing Capabilities
| Range of Capabilities, U.S. Units | Range of Capabilities, S.I. Units | |
| Self-Priming | All Grades | |
| Film Finish Available | Matte / Emboss | |
| Interleaf | Polyethylene | |
| Gauge Available | 15 to 50 mil | 380 to 1270 micron |
| Widths Available | 20 to 60 in | 510 to 1525 mm |
| Clean Room Production | All Grades | |
** Restriction may apply to certain film grades.
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 .