Bayfol® HX200 is a light-sensitive, self-developing photopolymer film which can be used to produce phase holograms in the form of volume reflection and volume transmission holograms. Bayfol® HX200 can be recorded with appropriate laser light within the visible spectral wavelength range from 440 nm to 680 nm. For hologram formation no further post-treatment is necessary, e.g. neither wet nor thermal treatment. Bayfol® HX200 consists of a three layer stack of a substrate, a light-sensitive photopolymer and a protective cover film. The substrate is a cellulose triacetate film (TAC), and the protective cover is a polyethylene film (PE). The protective cover film can be removed from the photopolymer.The product is capable of being used for a variety of types of volume holograms. Layer Stack, Schematic
Product description
Typical Values
Optical Properties
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Effective thickness shrinkage | after recording and UV flood cure 2) | approx. 1,4 | % | Reflection holograms |
| Typical substrate thickness | 60 | microns | acc. to ISO 4593, 23°C | |
| Typical photopolymer thickness | 16 | microns | white light interferometer | |
| Typical cover layer thickness | 40 | microns | acc. to ISO 4593, 23°C | |
| Recording dosage | (needed to achieve above mentioned values) | approx. 30 | mJ/cm² | Recording wavelenght: λ = 532 nm; Power density: PR= 4.6 mW/cm² |
| Typical recording dosage needed to achieve above ∆n1 values | ||||
| Light transmittance | Unrecorded film, w/o cover foilSee spectrum in the appendix | % | ASTM E 01348 | |
| Maximum refractive index modulation ∆n1 per recording wavelengt λ | ISO 17901-2 | |||
| Spectral diffraction efficiency η | > 95 | % | ISO 17901-1, by transmittance of zero-order transmitted wave | |
| Haze | after UV flood cure 2) | < 2 | % | ASTM D 1003 |
| Spectral bandwidth | (full width at half maximum) | > 15 | nm | ISO 17901-1, by transmittance of zero-order transmitted wave |
| Spectral shift | after recording and UV flood cure 2) | approx. -8 | nm | Denisyuk Holograms: wavelength deviation between recording / reconstruction |
| λ = 633 nm | > 0,03 | |||
| Index of refraction nD of the substrate | 1,485 | Prism coupler | ||
| λ = 532 nm | > 0,03 | |||
| Index of refraction nD of the photopolymer | unrecorded | 1,500 | Prism coupler | |
| λ = 457 nm | > 0,03 | |||
| Index of refraction nD of the photopolymer | after UV flood cure 2) | 1,505 | Prism coupler | |
| λ = 633 nm | Applied total dosage | approx. 15 | mJ/cm² | |
| λ = 532 nm | Applied total dosage | approx. 20 | mJ/cm² | |
| λ = 457 nm | Applied total dosage | approx. 25 | mJ/cm² |
Storage
The unrecorded photopolymer film should be stored in the original and sealed Covestro container that is used for delivery, whenever possible.The storage temperature shall be kept at ≥15°C and ≤ 25 °C.While the recorded film is quite stable, the unrecorded photopolymer film should be protected from light, humidity, heat and foreign materials.
Storage time
Six months Storage Time is recommended.
Processing
General information about handling instructions under dark room conditions:The product is light sensitive. Exposure to light prior to the holographic exposure might sacrifice the refractive index modulation Δn1 and diffraction efficiency η. Examples for tolerable expositions in dark room environment (dim yellow light) without sacrificing the holographic performance are given below:
Transmissions spectrum of the unrecorded photopolymer film.The transmission spectrum of the unrecorded photopolymer film was recorded after removal of the protective cover film.The measurement is done in a darkened laboratory with a spectrometer according to ASTM E 01348.
General information for flood cure and bleaching:These are recommendations and should serve as guidelines. According to the specific equipment components and the type of product to be produced, deviations from these guidelines might be necessary. The bleaching can also be adapted to the required product performance. Example: Conditions for mercury lamps High temperatures (above 60°C at the film) should be avoided because they can lead to deformation of the substrate. Dichroic mirrors that reflect UV-light and transmit IR-radiation and a fused silica panel in front of the lamp can reduce the amount of IR-radiation and thus further reduce the temperature.The following conditions were found to be favorable:• Photopolymer layer on substrate laminated to glass• Dosage: 5,000-10,000 mJ/cm²• Intensity at the sample: 40 mW/cm²These data were found using a mercury lamp (MH-Strahler UV-400 H) of Hönle UV Technology (http://www.hoenle.de).
Health and Safety Information
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.
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 .
