DIN 53100 Metallic Coatings - Nickel Plus Chromium and Copper Plus Nickel Plus Chromium Electroplating Coatings on Plastic Materials

The standard “DIN 53100 Metallic coatings - Electroplating coatings of nickel plus chromium and copper plus nickel plus chromium on plastic materials”, published by the German Institute for Standardization (DIN), describes the requirements for electroplating metallic coatings applied to plastic materials. This standard defines the technical specifications, quality requirements, and test methods for decorative and functional electroplating coatings applied to plastic surfaces. These coatings are widely used to give plastic parts a metallic appearance (chrome-like surface), provide corrosion protection, wear resistance, and improved surface properties.

Typical applications include:

• Automotive interior and exterior parts (e.g., grilles, emblems, trim, handles, frames)
• Sanitary fittings and bathroom accessories
• Home appliance and consumer electronics cases
• Decorative elements in various industries

The two main coating systems are:

• Nickel + Chromium
• Copper + Nickel + Chromium

In the second system, the copper substrate improves adhesion and flattening on non-conductive plastic surfaces that require special pretreatment (etching, activation, and chemical coating) before electroplating.

The DIN 53100 standard generally addresses the following:

• Layer structure and thickness requirements for different service conditions (e.g., indoor, outdoor, severe exposure)
• Adhesion between the coating and the plastic base material.
• Corrosion resistance (e.g., CASS test: copper through accelerated acetic acid salt spray or other corrosion tests)
• Appearance (gloss, homogeneity, freedom from defects such as pitting, cracking or burning)
• Stiffness and ductility of the layers
• Microporosity/microcracks in the chromium layer (important for corrosion performance; microporous or microcracked chromium helps distribute corrosion currents)
• Specialized test methods, including supplements such as Appendix F (glacial acetic acid test for corrosion resistance).

Test methods generally refer to or conform to international standards such as ISO 4520, ISO 9227, ASTM B368 (CASS test), and others.

The DIN 53100 standard is particularly important in the automotive industry, where chrome-plated plastic parts must meet high aesthetic and durability requirements under varying environmental conditions. Many automotive original equipment manufacturer specifications (e.g., VW, BMW, Mercedes) refer to or are based on the DIN 53100 standard for plated plastic components. It also serves as a technical reference in quality agreements between platers, plastic molders, and end-users.

Meanwhile, the new international standard “ISO 12994 Electroplating nickel plus chrome coatings for automotive plastic parts - Specification and test requirements” references the DIN 53100 standard as a normative or related document. This demonstrates a gradual harmonization towards ISO-level specifications in this field.

In short, the DIN 53100 standard includes a method for determining the burst strength of paper and cardboard, an important mechanical property used in the evaluation of packaging materials and printing papers. Burst strength measures the resistance of paper or cardboard to pressure applied perpendicular to its surface. This property is particularly important in packaging applications where materials need to withstand internal or external pressure during transport and handling.

The DIN 53100 standard specifies the following:

• A standardized test method
• Defined equipment requirements
• Controlled test conditions
• Calculation and reporting procedures

The main goal is to provide reproducible and comparable results between laboratories and manufacturers.

This method is based on hydraulic burst testing, typically performed using a Mullen-type burst testing machine. The method generally follows these steps:

• A circular test specimen is clamped tightly between two rings.
• The rubber diaphragm beneath the sample expands hydraulically.
• The pressure increases at a controlled rate.
• The pressure at which the sample ruptures is recorded as the burst strength.
• The result is usually expressed in kPa (kilopascals).

The following equipment is used in the tests:

• Calibrated blast resistance testing device
• Flexible rubber diaphragm
• A pressure gauge with a certain degree of accuracy.
• Compression device that provides even pressure.

To prevent premature or delayed rupture, the rate of pressure increase must be controlled.

The test conditions were defined as follows:

To ensure consistency, the samples should be as follows:

• It should be conditioned in a standard atmosphere (typically 23 degrees Celsius and 50 percent relative humidity).
• It must be cut without damaging the edges.
• It should be tested from both sides if necessary.

Since humidity significantly affects paper durability, environmental conditioning is crucial.

Burst strength is calculated directly from the maximum applied pressure at the moment of rupture.

Test reports typically include the following:

• Material description
• Conditioning environment
• Number of samples tested
• Average burst strength
• Standard deviation (if needed)

The DIN 53100 standard is widely used in the following areas:

• Wrapping paper
• Corrugated cardboard lining materials
• Kraft paper
• Cardboard production
• Quality control laboratories

This standard helps manufacturers verify product performance and compliance with customer specifications.

The DIN 53100 standard is considered important for the following reasons:

• It provides a uniform testing methodology.
• It enables international comparability.
• It supports quality assurance systems.
• It helps with product development.
• It reduces disputes between suppliers and customers.

Although international equivalents are widely used today, the DIN 53100 standard remains historically significant and is still referenced in some technical documents and specifications.

In conclusion, the DIN 53100 standard provides a clear and reliable method for determining the burst strength of paper and cardboard. By standardizing test procedures and conditions, it ensures that results are consistent, repeatable, and meaningful for industrial quality control and product comparison.

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 53100 standard.