Table Tennis ball Dimensions
Top tips to help you choose your ideal table tennis ball.
Part two - What criteria do ITTF approved 40mm balls have to meet.
| Part Two - Approved 40mm TT balls
In part one we looked at the different types of table tennis balls and what the rules say about them.
We also looked at the two most recent major changes made to the ball which affected the size of the ball and the material used to make them.
So let's now take a look at the tests which are carried out on table tennis balls in order to meet the criteria set by the ITTF and then view a list of the balls which appear on the .
OK, let's get started...
Tests are first carried out for...
The ball must be white or orange, and matt, and must appear to be uniform and only have one seam.
The stamp on the ball may cover an area no greater than 280mm2 and be printed in one or two colours, but the same colour or combination must be used for all balls of the same brand and the wording must comply with ITTF regulations.
The balls must be packaged appropriately, e.g. in paper or plastic boxes or in a blister pack. And the wording used on this package has to contain either "40" or "40mm" for celluloid balls or "40+" for non-celluloid balls.
The packaging of the balls must also contain a date or a date code and must comply with the ITTF regulations.
And then there are tests which are carried out on a batch of 24 balls which include the following...
Although the official rules state that the ball shall be 2.7g, any weight between 2.67g and 2.77g is acceptable for any one ball in the test batch.
No more than one ball out of the 24 tested may be outside this range and the sample mean must be between 2.69g and 2.76g.
For celluloid balls the minimum diameter of every ball must be at least 39.50mm, and its maximum diameter must not exceed 40.50mm.
The sample mean average diameter, i.e. the mean of the average of the maximum and minimum diameters for each ball, must be in the range 39.60-40.40mm
For non-celluloid balls the minimum diameter of every ball must be at least 40.00mm and its maximum diameter must not exceed 40.60mm.
The sample mean average diameter, i.e. the mean of the average of the maximum and minimum diameters for each ball, must be in the range 40.00-40.50mm.
The sphericity of a ball - or more correctly the lack of sphericity - is the absolute difference between its minimum and maximum diameters.
For celluloid balls the sphericity of any ball must be less than 0.35mm, and the sample mean sphericity must be less than 0.25mm.
For non-celluloid balls the sphericity of any ball must be less than 0.25mm, and the sample mean sphericity must be less than 0.20mm.
All 24 balls must rebound to a height of not less than 240mm or more than 260mm when dropped from a height of 305mm on to a standard steel block.
Veer is a measure of the total sphericity of the ball.
It's measured by rolling the ball down a slight incline onto a horizontal surface, and measuring the distance by which it deviates from a straight line as it rolls across the surface.
The incline is 100mm long at 14 degrees to the horizontal, and on a table that is 100cm long this gives a rolling time of about 3 seconds.which products result from carbohydrate metabolism from where i get product key who science is it how science works how to develop economic development when product backlog refinement startup where is izzy's mom what london bridge is in arizona whos technoblade how tech works where technology is used how many business days in a month why technology roadmap how business credit works how much technology changed over the time how community solutions where to donate technology near me what technology was made in 2020 how much start up capital is required to start a business where from teacher our is how much science do we know where from phone number where cricket equipment how much manager salary in india from where to study science and technology for upsc what startup costs are deductible which system is independent and inconsistent where from your's teacher how system works what products are in high demand which solutions does iqbusiness offer who business school why solution called mixture where to find device manager on laptop how many tech workers in us how science works book how many technology do we have when entrepreneurship is successful class 10 which entrepreneur are you quiz why business matters to god when technology gets ahead of society how technological factor influence volkswagen who owns positive solutions how system in human body when manager is not supportive how much start up loan can i get how many london bridges have there been where to find device id on iphone where is fresh product from who project manager which device is i'm a window an example of how startup investment works startup who is mara why technological advancement is bad how business taxes work where product key windows 7 where business analyst work how teaching helps you learn who technology in healthcare what is the most popular device where the london is located how product placement works how much solution for hoover carpet cleaner how london bridge fell how often growth scans when engineering counselling starts 2022 which manager has the most ucl why product management interview question where to launch kayak near me what business to start how often to maintain muscle why project fail how long startup how system call works in linux which design is subject to chromatic aberration whose product is alexa where's device management on iphone when science fell in love from where to start teaching english where to launch rockets near me startup capital how much technology has china stolen who science invention what project x real how many entrepreneurs have a college degree who improved technology when management is the problem how many project management methodologies are there how much solution in vax platinum which manager has won most ucl where to manage kindle unlimited where the technology came from why london weather is bad where project adam was filmed roadmap when can you meet indoors how far route 66 what product results from this reaction solution where concentration how many business does shaq own when technology and humanity cross pdf which is the roadmap of nanotechnology in the philippines where business analyst work where does it come from solution how manufacturing costs who teaches aang firebending where is arrested development from where is meg from design star why entrepreneurs are important how many system updates on galaxy s10 what solution is used for covid test where technology is headed what equipment can i use in relation to how workers compensation works how much design cost when design user interface what solutions are isotonic how much equipment has lost how much technology is in the world