![]() Since manufacturers are only required to publish the efficiency of the media with a micron rating, it is important to verify that your element is rated for an absolute micron.īeta ratio is often used when expressing filter efficiency for a given particulate size. An “absolute” rated element’s micron size is calculated as the largest particle that pass through the media during multi-pass testing and offers a more specific, consistent value. Nominal ratings are increasingly rare as their micron ratings are inconsistent and testing methods can vary. A “nominal” rating is an arbitrary micron value given by the manufacture based on a percentage of particulate weight removed during testing. To understand Beta ratio, it is important to understand if your element is rated as either nominal or absolute. (figure 1) How do you choose a quality filter element? How can you tell a cheap filter from a quality filter? Let’s look at filtration Beta ratio and better understand how filters are rated. ![]() A high quality hydraulic filter is the first line of defense for your fluid’s health. Fortunately, a hydraulic system can operate for many years with proper filtration techniques and testing. Difficulty faced, if any, may be brought to notice of the Board.Hydraulic fluid is the lifeblood of any hydraulic system. Board desires that suitable instructions regarding the correct classification of elements of Filters may be issued to the field formations. Filters by themselves would be classified under Heading 84.21.Ĥ. For instance, elements (of Filters) that are made up of paper would be classified in Headings 4812 or 4823 if made up of textile material for technical use then in Heading 59.11 if made up of glass then in Heading 70.19 etc. Thus, it emerges that elements of Filters are to be classified as per their constituent material. It should be noted, however, that filter blocks of paper pulp fall in heading 48.12 and that many other filtering elements (ceramics, textiles, felts, etc.) are classified according to their constituent material. Leaves for intermittent vacuum filters chassis, frames and plates for filter presses rotary drums for liquid or gas filters baffles and perforated plates, for gas filters. “Subject to the general provisions regarding the classification of parts (see the General Explanatory Note to Section XVI), the heading covers parts for the above-mentioned types of filters and purifiers. In this context, the Explanatory Note to Heading 84.21 provides that: These Explanatory Notes present an internationally accepted view of the scope of each Heading of the Customs Tariff. ![]() ![]() The scope of parts of articles covered by the said Heading 8421 is explained in the World Customs Organization’s Harmonized Commodity Description and Coding System Explanatory Notes. Heading 8421 of the Customs Tariff applies to, “ Centrifuges, including centrifugal dryers filtering or purifying machinery and apparatus, for liquids or gases”. Therefore, Board has examined the matter with a view to provide clarity in classification of said articles under the Customs Tariff Act, 1975.Ģ. These articles are also being classified under other Tariff Items viz. The Board has noted that while majority of import data in National Import Data Base shows that ‘ elements of Filters’ are being classified under Tariff Item 84219900 as parts of Filters. Subject: Classification of Elements of Filters of Heading 8421 – reg. ![]()
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