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
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
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 .
