All conveyor belts follow several internationally accepted rubber covering grade systems, most countries follow the German DIN22102 grade standard, of course, there are also regional grade standards, for example, most American countries are used to follow the American RMA grade standard, then what is the difference between these two standards?
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).
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 mm³, and grade 1 with tensile strength of 14 MPa, elongation at break of 400 % and volume loss of 175 mm³, This means that the standards established by ARPM have higher requirements for abrasion rate.
The DIN standard was established by the “German Institute for Standardization”, the letter “DIN” stands for “Deutsches Institut für Normung”, they formulate specifications and standards as a service to the German industry. They are a highly respected non-profit organization, it has been based in Berlin since 1917, many DIN standards have been converted to EN or even ISO standards. In Europe and many parts of the world, DIN standards are more generally recognized and accepted, especially in the case of abrasion resistant conveyor belt.
The main difference between the two standards is reflected in three technical parameters for rubber cover, namely, the Tensile Strength, the Elongation at Break and the Abrasion Loss.
Item | RMA-I | RMA-II | DIN-W | DIN-Z | DIN-Y | DIN-X |
Abrasion Loss (mm³) | max. 150 | max. 200 | max. 90 | max. 250 | max. 150 | max. 120 |
Tensile strength (Mpa) | min. 17 | min. 14 | min. 18 | min. 15 | min. 20 | min. 25 |
Elongation at break (%) | min. 400 | min. 400 | min. 400 | min. 350 | min. 400 | min. 450 |
The following table is currently the main internationally popular conveyor belt implementation standards:
Cover Grade | Country | Applicable Standards | Min.Tensile Strength(Mpa) | Min.Elongation at Break(%) | Max.Abrasion Loss(mm3) |
DIN-Z | Germany | DIN22102 | 15 | 350 | 250 |
DIN-Y | Germany | DIN22102 | 20 | 400 | 150 |
DIN-X | Germany | DIN22102 | 25 | 450 | 120 |
DIN-W | Germany | DIN22102 | 18 | 400 | 90 |
RMA-I | U.S.A | RMA | 17 | 400 | 150 |
RMA-II | U.S.A | RMA | 14 | 400 | 200 |
ARPM RMA-I | U.S.A | ARPM | 17 | 400 | 125 |
ARPM RMA-II | U.S.A | ARPM | 14 | 400 | 175 |
ISO-L | International | ISO -10247 | 15 | 350 | 200 |
ISO-H | International | ISO -10247 | 24 | 450 | 120 |
ISO-D | International | ISO -10247 | 18 | 400 | 100 |
AS-N | Australian | AS -1332 | 17 | 400 | 200 |
AS-M | Australian | AS -1332 | 24 | 450 | 125 |
AS-A | Australian | AS -1332 | 17 | 400 | 70 |
SANS-N | South Africa | SANS-1173 | 17 | 400 | 150 |
SANS-M | South Africa | SANS-1173 | 25 | 450 | 120 |
SANS-A | South Africa | SANS-1173 | 18 | 400 | 70 |
BS-M | UK | BS-490 | 24 | 450 | 120 |
BS-N | UK | BS-490 | 17 | 400 | 200 |
IS-N-17 | India | IS 1891 | 17 | 400 | 200 |
IS-M-24 | India | IS 1891 | 24 | 450 | 150 |
JIS-G | Japan | JIS-K 6332 | 14 | 400 | 250 |
JIS-L | Japan | JIS-K 6332 | 15 | 350 | 200 |
JIS-D | Japan | JIS-K 6332 | 18 | 400 | 100 |
JIS-H | Japan | JIS-K 6332 | 24 | 450 | 120 |
GB-H | China | GB/T 7984 | 24 | 450 | 120 |
GB-D | China | GB/T 7984 | 18 | 400 | 100 |
GB-L | China | GB/T 7984 | 15 | 350 | 200 |
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