Assembly rules in competition
The previous sections have described what the rules require of each component of the bat. What remains is to see how this is verified in practice: where, when and with what instruments a bat is checked for compliance before a match.
At tournaments applying the full ITTF protocol — world and continental championships, WTT circuit events and certain high-level national competitions — there is a space called the Racket Control Centre. The player hands their bat to a designated official — the racket tester — with a margin of time before being called to the table. The controller carries out four checks: flatness of the striking surface, with tolerances of the order of 0.2 mm of convexity and 0.5 mm of concavity (a criterion derived from the flat surface requirement set out in 3.1); total thickness of the covering, measured with an electronic gauge at four points on each face, against the 4.0 mm ceiling covered in 3.2; marking and LARC conformity, verifying that the ITTF logo, manufacturer and model are visible and appear on the list in force (3.4); and VOC control, by means of a portable detector — usually a MiniRAE-Lite, in use since 2009 — measuring volatile organic compounds, with a threshold of 3.0 ppm plus 10% instrumental tolerance (3.5).
Once the inspection is passed, the bat is sealed in a closed cover and held until the player collects it on the way to the table. The seal is the link guaranteeing the correspondence between what was inspected and what is played: without it, there is no match. If the bat does not pass, the player may present a backup that passes the same control, which is why competitors travel with at least two bats prepared in equivalent fashion.
From 2025 a second window has been added: the post-match inspection. In it, bats flagged as doubtful at the prior control — or selected by random sampling — undergo deeper scrutiny that may include removing the covering to examine blade and rubbers separately. The logic is twofold: to detect irregularities not visible at the prior control — non-volatile residues, structural modifications — and to deter through the uncertainty of sampling, in the manner of a doping control.
The scope of the procedure scales with the level of the tournament. The full Racket Control Centre operates on the international circuit. At national competitions the control is usually reduced to the prior inspection, applied to a portion of the matches according to the resources available and the number of certified racket testers. In regional leagues and club tournaments verification may be limited to a visual check of the marking and the thickness, or may not take place at all. That the procedure exists does not mean it is applied at every level; it means it is available as a standard and can be activated when the organisers judge it appropriate.
One final point: the rules assign responsibility for the bat to the player. A thickness outside tolerance or a positive VOC reading is not attributed to the manufacturer or to the technician who mounted the rubber. That is why the competitor learns to check their bats before a tournament — measuring thickness with a household gauge, checking flatness against a smooth surface, avoiding doubtful products in the preceding days — as a routine part of preparation. The next section brings this scale of control down to the question the chapter has been circling: of everything the rules regulate, what really affects the club player and what does not.