Overview of the CIPAC MT 185.1 wet screen test
In the case of pesticides and biocidal products, the quality of the formulation is not limited to the active ingredient content. The behavior of the product in water during use is a decisive factor in performance. This is exactly where the Cipac MT 185.1 wet screen test comes into play.
This method aims to measure the product's dispersibility by determining the amount of particles that do not dissolve or distribute sufficiently when mixed with water. This is a critical quality parameter, especially for water-dispersible powder and granular formulations.
Innovations through the revision of MT 185.1
The updates to the CIPAC methodology aim to make the tests more consistent and more comparable. With the MT 185.1 version:
- the two previous separate methods were summarized under a single standard
- the procedures were simplified and uniform application ensured
- the use of old methods was omitted in new specification work
This update makes it possible to reliably compare data from different laboratories.
Basic test purpose
The wet screen test simulates the practical application performance of a formulation. In particular, the following criteria are evaluated:
- Can the product be distributed homogeneously in water?
- Are there large particles or lumps?
- Is there a risk of clogging of the application devices?
The answer to these questions directly affects the success of the product in practice.
How does the analysis principle work?
The functioning of the test is very systematic. The sample is mixed with water under controlled conditions and the resulting suspension is passed through a sieve with a certain mesh size. The undissolved portion remaining on the screen is separated, dried and weighed.
The result is given as a percentage in relation to the total sample. In this way, the proportion of the failed dispersion in the formulation is clearly determined.
Wet screening as part of the GLP
The Good Laboratory Practice (GLP) includes not only the implementation of the test, but also the guarantee of data quality. Carrying out the CIPAC MT 185.1 test within the GLP provides the following advantages:
Trackability: Each step is logged and can be verified retrospectively.
Repeatability: tests performed under the same conditions provide similar results.
Compliance with regulations: A data collection recognized by international authorities is guaranteed.
This is particularly important for approval and product approval procedures.
Interpretation of the results
The value determined in the test indicates the percentage of the particles retained in the screen. A low value indicates that the product is successfully distributed in the water.
High values, on the other hand, may indicate the following problems:
- Insufficient formulation
- Agglomeration during storage
- Production-related problems
Areas of application
Areas of application
The CIPAC MT 185.1 test is used for a wide range of products:
- Pesticide formulations
- Biocidal products
- Granules and powder products diluted with water
This test plays a crucial role in many places, from the product development phase to quality control processes.
Rating from the point of view of the industry
The wet screen test is not only used to generate laboratory data, but also to predict the performance in the field. Products with low dispersion quality:
- can damage the application devices
- can affect the distribution of the active ingredient
- can reduce the expected biological effect
Therefore, the test results are evaluated as a criterion directly affecting the commercial success of the product.
General evaluation The CIPAC MT 185.1 wet screen test has developed into an indispensable method of analysis in modern development processes for pesticides and biocidal products. Thanks to its updated structure, it delivers more reliable and more comparable results. In connection with the GLP principles, it is no longer just a technical test, but also becomes an internationally recognized instrument of quality assurance.
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