The standard “DIN 53370 Testing of plastic films - Determination of thickness by mechanical feel”, published by the German Institute for Standardization (DIN), describes a reliable method for determining the thickness of plastic films using mechanical scanning (mechanical measurement or mechanical feel). This standard is widely used in the plastics industry, quality control laboratories, and material testing facilities. The primary purpose of this standard is to accurately measure the thickness of plastic films, especially flat, unembossed types, and also to detect thickness irregularities or variations.
This standard applies primarily to flat and unembossed plastic films (for which Method P is generally referenced). Variants or related procedures (e.g., Method F) may extend its applicability to embossed, textured, or other film types.
This method helps ensure consistency in film production, as thickness directly affects properties such as barrier performance, mechanical strength, optical transparency, and suitability for applications like packaging, labels, membranes, and technical films.
Thickness measurement is crucial because even small deviations can affect product performance, material utilization, and compliance with specifications.
The DIN 53370 standard defines a contact-based mechanical measurement performed using a precision thickness gauge (micrometer or similar device) with a defined contact pressure and foot geometry. The basic steps of this method are as follows:
This method is non-destructive for most films and provides high reproducibility when performed under controlled conditions (temperature, humidity).
Many film manufacturers and converters refer to the DIN 53370 standard in their material data sheets and specifications. Meanwhile, this standard uses a principle very similar to the “ISO 4593 Plastics - Film and sheet - Thickness determination by mechanical scanning” standard.
Test laboratories (for parameters such as permeability and mechanical properties) usually measure the thickness first according to the DIN 53370 standard, as accurate thickness is a prerequisite for calculating other parameters (e.g., permeability coefficients, tensile strength per unit thickness).
In short, the DIN 53370 standard outlines a method for determining the thickness of plastic films and sheets. Accurate thickness measurement is crucial in the plastics industry because many physical, mechanical, and barrier properties of films are directly dependent on their thickness. This standard is widely used in quality control, product development, and material comparison for thin plastic materials such as packaging films, technical films, and coated sheets.
The primary aim of the DIN 53370 standard is to provide a reliable and repeatable method for measuring the thickness of plastic films. Since films can be very thin and flexible, inaccurate measurement methods can lead to errors caused by compression or irregular surfaces.
This standard ensures that thickness measurements obtained in different laboratories are comparable and consistent. The main objectives are:
The DIN 53370 standard applies primarily to the following:
Typical materials tested include:
These materials are commonly used in packaging, automotive components, industrial membranes, and technical laminates.
The method, in principle, involves measuring the thickness of a film using a precision thickness gauge or micrometer with parallel measuring surfaces. The sample is placed between two measuring surfaces, and a defined measuring force is applied to avoid over-compressing the film. The device records the distance between the measuring surfaces corresponding to the film thickness.
This standard specifies the requirements for measuring instruments, typically including the following:
Contact surfaces must be smooth to avoid damaging the film or causing measurement errors.
Thickness is one of the most critical parameters for plastic films because it affects:
By following the DIN 53370 standard, manufacturers can be sure that the films meet stringent quality and performance requirements.
The industries that frequently use this standard include:
In conclusion, the DIN 53370 standard plays a significant role in the plastics and film manufacturing industries by defining a standardized method for measuring film thickness. This procedure provides accurate, repeatable, and comparable results, which are essential for quality assurance, product performance, and regulatory compliance.
For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services in accordance with the DIN 53370 standard.
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