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See https://www.tabletennisdaily.com/forum/topics/dhs-fans-unite.28518/post-529310 for links to the sourceWhat are the differences in performance between national sets, provincial sets, and hurricane sets? What are the common specifications for national team members? What is the difference between star national sets and national sets?
National hurricane sets, provincial hurricane sets, and general hurricane sets use the same formula. The main difference between the three is the tolerance accuracy of the indicators. For example, the hardness requirements of national team athletes can be accurate to 0.5 degrees and the thickness can be accurate to 0.05mm, so the detection tolerance range of national sets is smaller. The detection tolerance range for general athletes is slightly relaxed.
In addition, in different periods, top-notch players such as Ma Long will have different requirements for the viscosity of the rubber or the hardness of the sponge, which requires fine-tuning. Therefore, there are slight differences in the national sets of different stars, and there are also differences in the same star player in different technical cycles or event cycles....
Blue Provincial Madness seems to have increased in weight? Is it due to the formula adjustment or the glue? Starting from 2021, the blue sponge rubber used by the national team, provincial and municipal teams has been toughened. After the sponge toughness is improved, the sponge will withstand more and more intensive impact force and increase the service life of the sponge. After the blue sponge is toughened, the bottom strength is stronger, and the weight is slightly increased, generally 3-5 grams heavier.
That was translated using Google Translate so maybe it is not 100% correct.
In my area I would assume that they mean that the thickness can be nominal thickness ± 0.05 mm (which would basically mean that a 2.1 mm sponge can be a 2.15 mm in reality and vice versa) but I'm not sure if this is what DHS means. Measuring such thicknesses which such uncertainties (and lower uncertainties) can be done in production but again I don't know what DHS does, how well DHS controls production environments (temperature, humidity and so on).