UNECE Sizing
IV. PROVISIONS CONCERNING SIZING
Pre-basic TC are exempt from the minimum sizing requirements.
The minimum size of tubers must be such that they do not pass through a square gauge of 25 mm; for varieties having, on average, a length of at least twice the greatest width, the square gauge must not be less than 25 mm.
In the case of tubers, which are too large to pass through a square gauge of 35 mm, the difference between the maximum and minimum limits of size should be expressed in multiples of five.
The maximum variation in size between tubers in a lot must be such that the difference between the dimensions of the two square gauges used does not exceed 20 mm unless the buyer and seller agree to deviate from this requirement.
The lot shall conform to the distribution of tuber sizes of the harvested crop within the size specified on the label.
Seed potatoes are tubers or any other propagation material, other than true seed, of Solanum tuberosum L. acceptable for certification by the DA in accordance with the provisions concerning the variety (see Section II) and which, after regular inspection
V. PROVISIONS CONCERNING TOLERANCES FOR SIZING
Minimum size tolerances in per cent by weight of tubers: 10%
With a maximum deviation of 5 mm from the minimum size indicated for lots with tubers having a length of at least twice their maximum width 3%
For all other lots
Maximum size tolerances in per cent by weight of tubers 3%
Larger than the maximum size indicated