Flat sheets of celluloid are soaked in hot alcohol, once the celluloid sheet is soft it is pressed into a hemispherical mold. The edges outside the mold are then trimmed. The celluloid will remain in the mold until it has hardened. The mold is of one half of a ping pong ball. Once the celluloid is hardened the one half ping pong ball will be matched to another half by weight, the weight of the 2 halves should be identical. The two halves are then butted together they are lined with alcohol base glue. The balls are placed in a light agitation machine that will smooth the surface.
It's ready to be tested and graded on its quality. Ping pong balls are graded in stars, 3 stars being the highest (ITTF approved tournament-quality) to the lowest, seamed, less than 1 star grade (used for crafts or other uses other than ping pong). Everything from the seam on the ping pong ball, its weight, bounce and hardness will determine it's star rating.
Did you step on your ping pong ball and crush it? Or do you have one heck of a backhand that caused a dent? No need to throw that ping pong ball away! We're going to walk you through some very easy instructions on how to bring it back to its original shape.
What can ping pong balls be used for other than ping pong? This is a question customers have always asked, this is what we know: