How to compare gas test reports from different chemical filter manufacturers?

To compare gas test reports from different chemical filter manufacturers, it is necessary to unify the target gas, concentration, air volume, environment and penetration criteria. Just looking at removal rate, test duration or capacity figures can easily lead to mistaken comparison of results under different conditions. Most of the effort in reporting comparisons is spent on seeing clearly the conditions under which the data were obtained.

First confirm which product the report corresponds to

The test report provided by the manufacturer must first confirm that it corresponds to the model to be supplied, rather than other specifications or laboratory samples of the same series. Media type, filter element size, effective filtration area, frame structure, any one of them is different, and the reference degree of the test results will be compromised. Some reports mark the performance of media materials, and some test the entire filter element. The data calibers of the two are different. Before comparison, the sample information in the report should be compared item by item with the model, size, and media configuration of the product to be purchased. When Aili Industrial provides chemical filter configuration information, it can provide corresponding test conditions according to the model proposed for the project, so that customers can check the report and the actual product at the same level.

Target gas and concentration conditions must be comparable

Both reports say 'effective against acidic gases', but whether they tested HF or HCl, and whether the inlet concentration was 1ppm or 100ppm, the applicable scope of the conclusion is completely different. The capacity and penetration behavior of chemical filter media are significantly affected by concentration, and performance at low concentrations cannot be directly extrapolated to high concentration scenarios. Likewise, competitive adsorption of components in a gas mixture can alter the results of single gas tests. When comparing, it should be confirmed whether the test gas is the on-site target component, whether the concentration is close to the actual inlet level, and whether it contains interfering components. For selection ideas involving mixed gas configuration, please refer toCan different chemical filter materials be mixed in the same project?。

Air volume and surface speed determine whether the data can be used

The ratio of the test air volume of the filter element to its effective area (surface velocity) directly affects the contact time between the gas and the medium. Different contact times will lead to different penetration curves. A capacity data obtained under a small air volume may be significantly lower in actual performance in a system with a high surface speed. When comparing, the test air volume in the report should be converted to the actual surface velocity of the product to be used to determine whether the two are of the same magnitude. If the report only gives the air volume without marking the corresponding filter element size and effective area, this data has limited reference value in selection. For issues involving air volume and actual flux, please refer toMAU choose box type or V-type chemical filter?。

Penetration criteria and test endpoints must be written clearly

'Removal rate 99%' In this sentence, what needs to be asked is at what concentration, how long the operation will be, and when the outlet reaches the end point. The capacity of a chemical filter is usually expressed in terms of the accumulated treatment capacity that reaches a certain outlet concentration. Depending on the criteria, the reported capacity figures may vary greatly. When comparing two reports, you should find the respective definition of breakthrough: whether the outlet concentration reaches a certain percentage of the inlet, or whether it reaches an absolute concentration limit. Data with inconsistent criteria cannot be compared directly. Aili Industrial can assist in checking whether the criteria in the test report correspond to the protection objectives based on the project's export requirements.

Aili industrial supporting equipment

It is not uncommon for customers to ask us how to choose from several reports from different manufacturers. Our approach is usually to first list the test gas, concentration, surface velocity and penetration criteria of each report into a table to see which data were obtained under comparable conditions and which can only be used as a qualitative reference. Aili Industry can provide media configuration information for box-type, flat-type and V-shaped products in chemical filter packages. For box-type MAU packages, please refer toMAU box type chemical filter , product series can be viewedChemical filter product range . For equipment-side applications, chemical filtration FFU can integrate chemical adsorption layer and HEPA/ULPA particle filtration. The structure of chemical first and then particles is suitable for areas with AMC control requirements. The V-shaped structure provides a larger filtration area in the same box space, helping to control surface velocity and resistance while maintaining gas targets. The manufacturing end covers motors, fans, control systems, sheet metal and complete machine assembly. The correspondence between test conditions and actual operating conditions can be confirmed together during the matching stage. The specific gas effect and replacement cycle still need to be verified based on the corresponding configuration data and on-site working conditions. The actual results are subject to on-site leak detection and gas detection results.-4-8

Related questions and answers

Are reports with higher removal rates necessarily better?
uncertain. The removal rate needs to be combined with the test concentration, surface speed and penetration criteria. High removal rates may be achieved at low surface speeds and low concentrations, and the reference value is limited when there is a large difference from on-site conditions.

The test air volume is not included in the report, what should I do?
Without data on air volume and effective area, it is difficult to judge whether the surface speed is close to actual working conditions. You can obtain additional information from the manufacturer, or use the report as a qualitative reference rather than a quantitative basis.

Can Aili Industrial help interpret test reports from different manufacturers?
It can help sort out the comparable and different items of each report based on the project target gas and operating conditions. The specific selection judgment needs to be confirmed based on the proposed product data and on-site working conditions.

Related articles

• Do you need to know how many hours a day it will run when selecting a chemical filter?

• The gas concentration fluctuates greatly. Should the chemical filter be selected based on the average value or the short-term peak value?

• When changing chemical filter brands, how to confirm that the replacement model can be used?

• What basis should you look at when choosing a chemical filter manufacturer for a semiconductor AMC project?

Key points for selection and acceptance inspection