Analysis of technical cleanliness

Technical cleanliness is carried out to check for contamination by fine particles (metallic, non-metallic, fibres, etc.) that adhere to components and parts, thereby affecting the quality, safety and durability of products. 

These impurities can cause malfunctions, leading to premature failure of the product assembly or at least less efficient functioning. 

The components are subject to a permitted presence of impurities: 

  • the mass of impurities per product or surface (gravimetric requirement), 
  • particle size distribution, 
  • maximum particle size. 

Technical cleanliness analysis is performed on: 

  • plastic pieces, 
  • metal pieces, 
  • printed circuit boards. 


Technical cleanliness analyses are carried out according to the following standards and specific requirements: 

  • ISO 16232:2018, 
  • VDA 19, part 1:2015, 
  • car manufacturers (e.g. PV 3347), 
  • the client’s requirements. 

At LOTRIČ Certification we offer: 

  • help you understand the requirements of the standards,
  • technical cleanliness testing services on products, 
  • monitoring cleanliness in production. 
Completion time: 5-10 working days from receiving the samples.
Technical cleanliness testing on products

We carry out cleanliness analyses using the latest methods and in accordance with the most recent standards. 

The analysis process consists of two parts: 

  1. We wash the piece first to extract the particles into the solvent, which is then filtered. In this way, all potentially harmful particles are transferred to the filter.
  2. The particles are analysed gravimetrically or microscopically. They are then classified into size classes, viewed with a light microscope and separated according to type. 
Technical cleanliness
Tips for sending samples for technical cleanliness analysis

When sending samples, it is recommended that: 

  • send a representative sample, 
  • document the sampling procedure, 
  • protect the sample with suitable packaging (do not use paper, cardboard or plastic foam). 

To prepare your offer, we will need: 

  • information on the sample: requirements, technical drawing, information on the surface of the piece, 
  • specifications and standards, 
  • whether it is a first analysis of the sample or a repeat analysis (requalification). 

Decontamination extraction stations of the French manufacturer Cleanpart´ner



LOTRIČ Certification is a representative of the French company Cleanpart´ner. The product range includes six size classes from DSS1 to DSS6. 

The different chamber sizes allow the extraction of particles on small, medium or very large products in accordance with the applicable standards (e.g. ISO 16232 and VDA19).  


We are available for further questions and information: 
Marjetka Lotrič, Sales – testing department
Phone: + 386 31 640 252