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Thin-Film Selection Guide

    The following selection guide lists all of the Thin-film sample supports manufactured by Chemplex® Industries, Inc. Use of the table is quite simple, just click on the heading of the column of interest and the table will be refreshed, and sorted by the values selected in the column. Click on the column heading again and it will be sorted in the reverse order. This will allow grouping of the Thin-film support windows by the parameters of interest to suit your needs. For example, when looking for all Chemplex® Thin films with a thickness of 7.5µm, click on the column heading of “Thickness” and then scroll to the entries with the value of 7.5 µm. All of them will be listed together.

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XRF Sample Cups and Thin-Film Sample Support Windows are the basic necessities for containing and analyzing samples by XRF spectroscopy. Superficially, the procedure appears relatively simple. Attach a thin-film to one end of a new sample cup, introduce the sample and insert it in an x-ray machine for elemental analysis.


Selection of a suitable thin-film sample support window is mostly based on satisfying primary important laboratory requirements:




  • Convenience of use



  • Contamination avoidance



  • Chemical Resitance to samples



  • Analyte-line transmittance and intensity



The information presented entails the main packaging forms of thin-films that are offered, the various types of thin-films, a methodology for evaluating an appropriate thin-film for maximizing analyte-line percent transmittance and the resistance to sample chemical attack. Other issues of laboratory concern may include sample weight retention strength, performance under differential pressure conditions, integration time, excitation potential and related heat generation.


CONVENIENCE OF USE AND CONTAMINATION AVOIDANCE Dispensing and handling of thin-film in attempt to prepare a sample cup with a sample support window is frustrating, inconvenient and a source for contamination. This is attributed to the static electrical charges inherent to the thin-films that create static cling. The thin-film tends to stick to any surrounding object and one’s person. This phenomenon presents the potential of contaminating the thin-film and affecting analytical x-ray data.
With the advent of SpectroMembrane® Sample Support Carrier Frames, there is no annoying static cling or potential contamination risk to the thin-film through handling or attraction of airborne particles. With the exception of the sample cup, the thin-film is never in intimate contact with anything else. Thin-film handling is performed by the use of the integrated carrier frames that automatically detach during the assembly process leaving taut thin-film sample planes.


TRANSMITTANCE OF SPECTRAL LINES The transmittance properties of a thin-film are functions of gauge thickness, density and mass attenuation coefficients of the constituent chemical elements. The Analyte-Line Transmittance chart, above with the photographs, may aide in selecting the correct thin-film for a given sample of analytical interest. Simply refer to the spectral line of the element in the sample having the lowest energy, KeV, or the longest wavelength, Å. Then choose a curve with the highest percentage of transmittance. Finally use the Legend to determine which material and thickness.


CHEMICAL RESISTANCE In conjunction with selecting a thin-film providing a high % Transmittance value for an element analyte-line of interest, evaluation of resistance to chemical attack by a sample is an appropriate consideration. Liquid samples are generally more prone to thin-film degradation and rupture than other sample forms. Refer to the “Resistance of Thin-Film Substances to Chemical Attack” table.
Other factors equally influential to the integrity of a thin-film substance are:




  • Integration time – extended analysis time



  • Excitation potential – intense x-ray exposure



  • Heat generation – from the sample



It is strongly urged that thin-film substances are subjected to judicious testing and evaluation prior to actual use to avoid inadvertent mishaps during analysis and potential damage to the x-ray instrumentation and costly ensuing clean-ups.

IMPORTANT: The chemical resistances of thin-films contained in the following table are provided as a matter of informational purposes only. They are not intended to preclude actual testing and suitability of use and applications. The responsibility of acceptance, suitability, testing, evaluation and safety resides totally with the user. Chemplex® Industries, Inc. assumes no liability whatsoever in using any thin-film sample support window substances and assumes no liability whatsoever for any information, advertisement, inferences, reports or any other form of communication written or orally presented.

ETNOM®
Etnom® was the first thin-film substance to chemically resist attack by aliphatic and especially aromatic hydrocarbons and have the unique characteristic of contracting when exposed to petrochemical hydrocarbons. This unique characteristic allows the thin-film to remain taut when exposed to samples containing these hydrocarbons and maintain a consistent taut flat sample support window plane during the entire integration time of analysis. Etnom® is available in a variety of thicknesses ranging from 1.5 through 3.0µm; it is frequently used and ideally suitable for sulfur analysis in aliphatic and particularly aromatic hydrocarbons.  2.0, 2.5 and 3.0µm Etnom® thin-films are limited in availability only to SpectroMembrane® Carrier Frames

Zythene®
Zythene® thin-film is chemically resistant to petrochemicals and, unlike any other thin-film, is also capable to contract upon contact with aliphatic and aromatic hydrocarbons. This particular trait is responsible for establishing and maintaining taut sample support window planes during the entire integration time of analysis. Adding this unique quality to the unusually high sample retention tensile strength of Zythene®, samples are safely contained in their sample cups with a rare likelihood of rupture. Coincidentally, 6.0µm Zythene® exhibits a similar mass attenuation coefficient to 6.0µm Mylar®. This implies the % Transmittance of 6.0µm Zythene® and 6.0µm Mylar® is similar and the expectant element spectral-line intensities are also similar. However, this similarity does not negate the need for cursory calibration verification.  6.0µm Zythene® is limited in availability only to SpectroMembrane® Carrier Frames.

Prolene®
Prolene® thin-film is a two constituent element combination of carbon and hydrogen. The light carbon and hydrogen element constituents together with gauge thickness translate into mass attenuation coefficients providing high % Transmittance values, an advantage for investigating the less energetic (KeV) analyte spectral lines in low element concentrations. Prolene® represents a good general purpose thin-film for most chemical solution samples except for those consisting of ethers or aromatic and halogenated hydrocarbons. It also is characterized with a relatively high sample retention tensile strength for safely containing samples in their sample cups. Prolene® thin-film is available in 3.0 and 4.0µm gauges and in SpectroMembrane® Carrier Frames.

KAPTON®
Our new 7.5µm Kapton® thin-film available from Chemplex® exhibits similar properties as the previous traditionally used type: 7.5µm gauge, high sample retention tensile strength, equivalent % Transmittance values of x-rays, chemical resistance and melting points. The difference between the previous Kapton® film and the new Chemplex® 7.5µm Kapton® thin-film is “it is not subject to the U.S. International Traffic in Arms Regulations (ITAR).”  Reportedly, an unknown slight difference between the ITAR controlled and the new 7.5µm Kapton® thin-film may affect the reliance on previously established calibration data. Chemplex® suggests judiciously re-examining this issue for verification prior to implementing an analytical program. 

Polypropylene
Polypropylene thin-film is available in 6.0 and 12.0 µm in SpectroMembrane® Carrier Frames. The thin-film serves a dual purpose; it is noted for its high % Transmittance for the lighter elements in low to medium concentration ranges and exceptional transmittance for the heavier element spectral lines. Reportedly, the thicker 6.0 and 12.0µm gauges are more preferable for retaining some samples and applications that demand an extraordinary higher level of security against inadvertent thin-film rupture.    

MYLAR®
At one time, Mylar® thin-film was the only substance used in the XRF spectrochemical field and supplied only in roll form. With the passage of time, Chemplex® introduced the expansion of the Mylar® product line to include additional gauges and all other forms of physical presentation such as pre-cut square sheets, pre-cut circles, perforated pre-cut squares in rolls and recently in SpectroMembrane® Carrier Frames. Mylar® is a relatively good thin-film substance for general purpose aqueous sample solution containment. It has an excellent sample retention tensile strength. It is not suitable for containing aliphatic alcohols, alkalies, esters, aromatic hydrocarbons and keytones.

 

 

Chemical

Mylar®

Poly-Carbonate

ETNOM®

Polypropylene®

Kapton®

Prolene®

Ultra Ployester®

Zythene

Acid, diluted or   weak

Good

Good

Good

EXC

NR

Good

Good

Good

Acids, conc.

Good

Good

Good

EXC

NR

EXC

Good

Good

Alcohols, aliphatic

NR

Good

Good

EXC

Good

EXC

NR

Good

Aldehydes

UNK

Fair

Fair

EXC

EXC

EXC

UNK

Fair

Alkalies, conc.

NR

NR

Good

EXC

EXC

EXC

NR

Good

Esters

NR

NR

Fair

Good

Good

Good

NR

Fair

Ethers

Fair

NR

Fair

NR

UNK

NR

Fair

Fair

Aliphatic Hydrocarbons

Good

NR

EXC

Good

EXC

Good

Good

EXC

Aromatic   Hydrocarbons

NR

NR

EXC

NR

EXC

NR

NR

EXC

Hydrocarbon Halogenated

Fair

NR

Fair

NR

Fair

NR

Fair

Fair

Ketones

NR

NR

Good

Good

Good

Good

NR

Good

Oxidizing Agents

Fair

NR

Fair

Fair

NR

Fair

Fair

Fair

 

 

 

 

 

 

IMPORTANT: Some window materials may not be suitable for analyzing sulfur in diesel fuel, gasoline and other petroleum products containing aromatic hydrocarbons. ASTM D-6445-99 (Reapproved 2004) e1: "Samples of high aromatic content may dissolve polyester and polycarbonate films. In these cases, other materials besides these films may be used for X-ray windows, provided that they do not contain any elemental impurities. ASTM D 4294-08a: "Any film that resists attack by the sample, is free of sulfur, and is sufficiently X-ray transparent can be used. Film types can include polyester, polypropylene, and polycarbonate. However, samples of high aromatic content can dissolve polypropylene, polycarbonate and polyester."

® SpectroCertified, Prolene, Etnom, Ultra-Polyester and Chemplex are registered trademarks of Chemplex Industries, Inc.

® Mylar and Kapton are registered trademarks of E. I. DuPont de Nemours & Co., Inc.

 

 

Cat. No. Type Thickness Format Size Qty/Pack Price Price for
Qty 12+
Qty
425-PP Polypropylene 6.0µm (0.24mil) Roll - PrePerf 3.0" (76.2mm) 300' (91.4m)
$70.00
$65.00
3021-5 Kapton® 7.5µm (0.3mil) SpectroMembrane® 2.5" (63.5mm) 100
$195.00
3012 Mylar® 2.5µm (0.1mil) SpectroMembrane® 3.0" (76.2mm) 100
$28.50
3030 Etnom® 2.5µm (0.1mil) SpectroMembrane® 3.0" (76.2mm) 100
$50.50
150-PP Mylar® 3.6µm (0.14mil) Roll - PrePerf 3.0" (76.2mm) 300' (91.4m)
$55.00
$50.00
2042R6M3.6 Mylar® 3.6µm (0.14mil) SpectroFilm® 2.36" (60mm) OD/ 1.65" (42mm) ID 25
$25.00
158 Mylar® 3.6µm (0.14mil) Precut Circles 3.5" (89mm) 500
$70.00
$65.00
325 Micropourous 25µm (1.0mil) Roll 3.0" (76.2mm) 200" (5.08m)
$50.00
3025 Etnom® 3.0µm (0.12mil) SpectroMembrane® 2.5" (63.5mm) 100
$48.00
427 Prolene® 4.0µm (0.16mil) Precut Circles 2.5" (63.5mm) 1000
$260.00
$255.00
3017-35 Prolene® 4.0µm (0.16mil) SpectroMembrane® 1.38" (35mm) 100
$50.00
3020 Polypropylene 6.0µm (0.24mil) SpectroMembrane® 3.0" (76.2mm) 100
$37.50
425 Polypropylene 6.0µm (0.24mil) Roll 3.0" (76.2mm) 300' (91.4m)
$70.00
$65.00
107 Mylar® 2.5µm (0.1mil) Precut Circles 2.5" (63.5mm) 1000
$100.00
$95.00
2020R35E3.0 Etnom® 3.0µm (0.12mil) SpectroFilm® 1.38" (35mm) OD/ 0.78 (20mm) ID 25
$25.00
3018 Prolene® 4.0µm (0.16mil) SpectroMembrane® 3.0" (76.2mm) 100
$37.50
150 Mylar® 3.6µm (0.14mil) Roll 3.0" (76.2mm) 300' (91.4m)
$55.00
$50.00
426 Prolene® 4.0µm (0.16mil) Precut Circles 2.5" (63.5mm) 500
$140.00
$135.00
446-5 Kapton® 7.5 μm (0.3mil) Precut Circles 2.5" (63.5mm) 500
$450.00
$445.00
3016 Mylar® 6.0µm (0.24mil) SpectroMembrane® 3.0" (76.2mm) 100
$26.50
90 Ultra-Polyester® 1.5µm (0.06mil) Roll 3.0" (76.2mm) 300' (91.4m)
$125.00
$120.00
106 Mylar® 2.5µm (0.1mil) Precut Circles 2.5" (63.5mm) 500
$60.00
$55.00
3022-5 Kapton® 7.5µm (0.3mil) SpectroMembrane® 3.0" (76.2mm) 100
$195.50
3013 Mylar® 3.6µm (0.14mil) SpectroMembrane® 2.5" (63.5mm) 100
$27.00
3031 Etnom® 2.0µm (0.08mil) SpectroMembrane® 2.5" (63.5mm) 100
$58.00
250-PP Mylar® 6.0µm (0.24mil) Roll - PrePerf 3.0" (76.2mm) 300' (91.4m)
$45.00
$40.00
2042R6P3.0 Prolene® 3.0µm (0.12mil) SpectroFilm® 2.36" (60mm) OD/ 1.65" (42mm) ID 25
$25.00
159 Mylar® 3.6µm (0.14mil) Precut Circles 3.5" (89mm) 1000
$115.00
$110.00
325-C Micropourous 25µm (1.0mil) Precut Circles 2.5" (63.5mm) 100
$55.00
3026 Etnom® 3.0µm (0.12mil) SpectroMembrane® 3.0" (76.2mm) 100
$48.50
475 Polypropylene 12.0µm (0.5mil) Roll 3.0" (76.2mm) 300' (91.4m)
$60.00
$55.00
437 Polypropylene 6.0µm (0.24mil) Precut Circles 2.5" (63.5mm) 1000
$240.00
$235.00
3019-45 Polypropylene 6.0µm (0.24mil) SpectroMembrane® 1.77" (45mm) 100
$50.00
3023 Polypropylene 12.0µm (0.5mil) SpectroMembrane® 2.5" (63.5mm) 100
$29.00
157 Mylar® 3.6µm (0.14mil) Precut Circles 2.5" (63.5mm) 1000
$90.00
$85.00
2020R35M3.6 Mylar® 3.6µm (0.14mil) SpectroFilm® 1.38" (35mm) OD/ 0.78 (20mm) ID 25
$25.00
3018A Prolene® 3.0µm (0.12mil) SpectroMembrane® 3.0" (76.2mm) 100
$46.50
250 Mylar® 6.0µm (0.24mil) Roll 3.0" (76.2mm) 300' (91.4m)
$45.00
$40.00
436 Polypropylene 6.0µm (0.24mil) Precut Circles 2.5" (63.5mm) 500
$120.00
$115.00
3014-35 Mylar® 3.6µm (0.14mil) SpectroMembrane® 1.38" (35mm) 100
$35.00
3017 Prolene® 4.0µm (0.16mil) SpectroMembrane® 2.5" (63.5mm) 100
$37.00
95 Etnom® 1.5µm (0.06mil) Roll 3.0" (76.2mm) 300' (91.4m)
$155.00
$150.00
156 Mylar® 3.6µm (0.14mil) Precut Circles 2.5" (63.5mm) 500
$55.00
$50.00
3080 Zythene® 6.0µm (0.24mil) SpectroMembrane® 2.5" (63.5mm) 100
$42.00
3014 Mylar® 3.6µm (0.14mil) SpectroMembrane® 3.0" (76.2mm) 100
$27.50
3032 Etnom® 2.0µm (0.08mil) SpectroMembrane® 3.0" (76.2mm) 100
$58.50
416-PP Prolene® 4.0µm (0.16mil) Roll - PrePerf 3.0" (76.2mm) 300' (91.4m)
$100.00
$95.00
2042R6E3.0 Etnom® 3.0µm (0.12mil) SpectroFilm® 2.36" (60mm) OD/ 1.65" (42mm) ID 25
$25.00
3011 Mylar® 2.5µm (0.1mil) SpectroMembrane® 2.5" (63.5mm) 100
$28.00
3029 Etnom® 2.5µm (0.1mil) SpectroMembrane® 2.5" (63.5mm) 100
$50.00
100-PP Mylar® 2.5µm (0.1mil) Roll - PrePerf 3.0" (76.2mm) 300' (91.4m)
$60.00
$55.00
477 Polypropylene 12.0µm (0.5mil) Precut Circles 2.5" (63.5mm) 1000
$170.00
$165.00
3031-35 Etnom® 2.0µm (0.08mil) SpectroMembrane® 1.38" (35mm) 100
$61.00
3024 Polypropylene 12.0µm (0.5mil) SpectroMembrane® 3.0" (76.2mm) 100
$29.50
257 Mylar® 6.0µm (0.24mil) Precut Circles 2.5" (63.5mm) 1000
$80.00
$75.00
2020R35P3.0 Prolene® 3.0µm (0.12mil) SpectroFilm® 1.38" (35mm) OD/ 0.78 (20mm) ID 25
$25.00
3019 Polypropylene 6.0µm (0.24mil) SpectroMembrane® 2.5" (63.5mm) 100
$37.00
416 Prolene® 4.0µm (0.16mil) Roll 3.0" (76.2mm) 300' (91.4m)
$100.00
$95.00
476 Polypropylene 12.0µm (0.5mil) Precut Circles 2.5" (63.5mm) 500
$105.00
$100.00
3017A-35 Prolene® 3.0µm (0.12mil) SpectroMembrane® 1.38" (35mm) 100
$50.00
3017A Prolene® 3.0µm (0.12mil) SpectroMembrane® 2.5" (63.5mm) 100
$46.00
100 Mylar® 2.5µm (0.1mil) Roll 3.0" (76.2mm) 300' (91.4m)
$60.00
$55.00
256 Mylar® 6.0µm (0.24mil) Precut Circles 2.5" (63.5mm) 500
$48.00
$43.00
3081 Zythene® 6.0µm (0.24mil) SpectroMembrane® 3.0" (76.2mm) 100
$42.50
3015 Mylar® 6.0µm (0.24mil) SpectroMembrane® 2.5" (63.5mm) 100
$26.00
3090 Ultra-Polyester® 1.5µm (0.06mil) SpectroMembrane® 3.0" (76.2mm) 100
$68.00