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testing methods. These pages answer many of the questions that are often asked about film properties, including: How is the property measured? What is the test method reference (ASTM or internal)? Main BOPP film properties. Yield, unit weight and gauge. Wetting tension. Tensile strength and elongation at break, elastic modulus. Thermal shrinkage.
- Tips For Metering
- Determining Developing Time
- An Overview of Expansion and Contraction
Make sure you are in the same light in which you intend to shoot. Film has different sensitivities to daylight and tungsten light. If you shoot primarily natural light pick a day with clear skies and set up in the shade for the most even illumination of your backdrop. If you are a studio shooter, use your normal setup of strobes or hot lights. Mete...
Set your meter to the film speed determined from the first testUsing the same setup as before, make a series of Zone V and Zone VIII exposures followed by a blank exposure for the entire rollIn a darkroom or changing bag, cut off a section of the roll and load it in a developing tank.Rewind the remaining roll back into the canister or store in a light-tight container for subsequent testsThe next step in testing for Zone System processing would be determining times for expansion and contraction (referred to as ‘N plus’ or ‘N minus’ development). I have not included examples in this article as it is of limited utility to 35mm and 120 shooters because we are locked into the same processing time for the entire roll. This is where the ...
For a high-quality finish and all the data you need, our top notch film testing solutions are the answer. Film testing. There are a few key areas for testing when it comes to understanding the properties of a film sample, these include: Water permeation testing; This allows you to determine how impervious your film is to the permeation of water ...
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Testing and analysis of films used in industrial packaging. Intertek packaging film testing and analysis techniques are available for industrial packaging materials testing. General purpose films and heavy duty films: Thickness measurements. Tensile test. Puncture test. Tear resistance. Falling dart impact resistance.
We offer testing services for many film test standards, including: ASTM D882; Tensile Properties of Thin Plastic Sheeting; ASTM D1004; Tear Resistance (Graves Tear) of Plastic Film and Sheeting; ASTM D1708; Tensile Properties of Plastics by Use of Microtensile Specimens; ASTM D1709; Impact Resistance of Plastic Film by the Free-Falling Dart Method
ASTM D882 is a common testing standard that is used to determine the tensile properties of thin plastic films and is commonly used for in-line quality control purposes. This guide is designed to introduce you to the basic elements of an ASTM D882 tensile test and will provide an overview of the equipment, software, and samples needed.
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