{"id":2259,"date":"2021-10-06T13:26:35","date_gmt":"2021-10-06T05:26:35","guid":{"rendered":"https:\/\/www.sungda.com\/?p=2259"},"modified":"2025-12-02T13:18:34","modified_gmt":"2025-12-02T05:18:34","slug":"what-are-the-rma-i-and-rma-ii-standards-for-conveyor-belts","status":"publish","type":"post","link":"https:\/\/www.sungda.com\/index.php\/what-are-the-rma-i-and-rma-ii-standards-for-conveyor-belts\/","title":{"rendered":"RMA-I & RMA-II Rubber Conveyor Belts–SUNGDA"},"content":{"rendered":"\n
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With the rapid development and integration of the world economy, conveyor belt products have played a very important role, especially in the field of bulk material transportation, mining and energy. Among all the technical standards of conveyor belts, the most commonly used ones are also the most important specification is the technical standard of the rubber cover.<\/p>\n\n\n\n

All conveyor belts follow several internationally accepted rubber cover rating systems, most countries follow the German DIN22102 Grade standard, and of course there are regional grade standards, for example, American countries are accustomed to following the RMA grade standard, other countries also have their own overlay standards, such as China\u2019s GB\/T7984, Australia\u2019s AS1332, Japan\u2019s JISK6322, the United Kingdom\u2019s BS-490 and South Africa\u2019s SANS-1173, etc.<\/p>\n\n\n\n

 These standards are designed to provide end users with information on different applications refer to what grades are used in these ratings. These ratings specify different laboratory test standards, but do not provide any performance guarantees in specific applications. <\/p>\n\n\n\n

In the selection of conveyor belts and international trade business, understand these standards and how to convert each other among these standards is very important, let\u2019s take a look at the RMA standard:<\/p>\n\n\n\n

RMA is the abbreviation of “Rubber Manufacturers Association”in United States, it has established two standard grades of rubber conveyor belt cover: RMA-I and RMA-II, the RMA-I (17Mpa) grade meets the higher requirements of rubber stretch and elongation, and usually shows higher cutting and scratch resistance than the RMA-II (14Mpa). It should be noted that grades do not necessarily indicate overall wear resistance. The International Organization for Standardization (ISO) also established a grading system under ISO 10247.<\/p>\n\n\n\n

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The rubber profile ready for package<\/figcaption><\/figure>\n\n\n\n

This standard includes:<\/p>\n\n\n\n

Category H (Severe Cut and Gouge Service, Category)<\/p>\n\n\n\n

Category D (Severe Abrasion Service)<\/p>\n\n\n\n

Category L (Moderate Service).<\/p>\n\n\n\n

Among them, category H is roughly comparable to RMA Grade I; categories D and L approximate RMA Grade II belting.<\/p>\n\n\n\n

 ARPM (Association for Rubber Products Manufacturers), a successor of RMA. Published their conveyor belt handbook in 2011, determining grade 1 with tensile strength of 17 MPa, elongation at break of 400 % and volume loss of 125 mm\u00b3, and grade 1 with tensile strength of 14 MPa, elongation at break of 400 % and volume loss of 175 mm\u00b3, This means that the standards established by ARPM have higher requirements for abrasion rate.<\/p>\n\n\n\n

Performance characteristics and application of RMA-I rubber cover<\/strong><\/p>\n\n\n\n