Dynasphere Vanadium balls?

[jtompilot]

On Seybert’s web site they have Vanadium 572, 57.2mm(4 1/4”) 169 grams and Vanadium English 524, 52.4mm(4 1/8”) 169 grams. How can two advanced phenolic balls of different sizes weigh the same? Reminds me of the small ball set at Shooters. Are English balls used on snooker tables?

 

[Bob Jewett]

On Seybert’s web site they have Vanadium 572, 57.2mm(4 1/4”) 169 grams and Vanadium English 524, 52.4mm(4 1/8”) 169 grams. How can two advanced phenolic balls of different sizes weigh the same? Reminds me of the small ball set at Shooters. Are English balls used on snooker tables?

I suspect it's a typo. 52.4mm is about 2 1/16 inches, so that's a typo for sure. Snooker balls are specified as 52.5mm. English eight ball is with smaller balls, usually, 2-inch for the object balls (reds and yellows) and often smaller for the cue ball.

I think the density of pure phenolic would give a pool ball much lighter than 169 grams, and the weight is achieved by adding other material. To achieve a snooker ball of the same weight (169 grams), the density would have to be increased by about 30% more.

The volume of a pool ball is a little under 100cc (98 for 57.2mm), so 169 grams gives a density of 1.725 grams/cc or 1.725 times water. That is within the range of the density of ivory. I suspect that's what they shot for, or maybe one step removed if clay balls were made to match ivory and then phenolics were made to match clay.

 

[garczar]

On Seybert’s web site they have Vanadium 572, 57.2mm(4 1/4”) 169 grams and Vanadium English 524, 52.4mm(4 1/8”) 169 grams. How can two advanced phenolic balls of different sizes weigh the same? Reminds me of the small ball set at Shooters. Are English balls used on snooker tables?

they don't weight the same.