What is inside a tennis ball?
Daniel Moore
Published Jan 23, 2026
Pressurized tennis balls are made of a coating of rubber surrounding a hollow center. There is a thin layer of adhesive on the rubber. Pressurized tennis balls are filled with either air or nitrogen, with nitrogen keeping the balls inflated longer.
Is the inside of a tennis ball poisonous?
“Tennis balls are made for tennis; they are not marketed or sold as pet toys, but we want to assure our customers that no toxic materials are added to our tennis balls, and we would never knowingly market a product that harms animals or humans.”
What is inside a tennis ball made of?
Tennis balls are filled with air and are surfaced by a uniform felt-covered rubber compound. The felt delays flow separation in the boundary layer which reduces aerodynamic drag and gives the ball better flight properties.
What is the white powder inside a tennis ball?
There was a white smooth powder inside. The white powder is essentially micro cells holding the pressurized air. There should be around 700 million micro cells in every Tretorn X tennis balls (according to manufacturer), but I did not count them.
Is a tennis ball hollow or solid?
What are tennis balls made of? Tennis balls consist of a two-piece rubber shell that manufacturers mold together to form a hollow core, injected with pressurized gas to give the ball its bounce, and wrapped with a synthetic felt that glues to the surface for durability.
24 related questions foundShould I let my dog chew tennis balls?
Choking Hazard
The tennis ball can split apart in the back of the throat, blocking your dog's airway. This can be fatal for your dog. The tennis ball can also break down into pieces as the dog chews, which creates a high risk that your dog will ingest those pieces.
How is tennis ball felt made?
Machines cut long pieces of bright yellow felt into two shapes that are wrapped around each tennis ball to form a covering. Ball makers heat the completed tennis balls to make the glue form a seal that holds the two pieces of fabric together.
How tennis balls are made and manufactured?
This rubber-based core compound made of materials including clay (which deadens rebound), is repeatedly crushed in an open mill for five minutes. Slugs are cut from the rubber-based core compound, which is then compression moulded for 90 seconds into a thin shell. Once the slugs are compressed, a sheet is made.
Are tennis balls made by hand?
The covering is either done by machine or by hand, with hand covering being the more accurate method. Next, air bubbles are removed in a rolling machine and then the balls move on to another vulcanizing process, whereby the felt covering is bonded firmly to the rubber sphere.
What gas is in tennis balls?
Pressurized tennis balls are filled with either air or nitrogen, with nitrogen keeping the balls inflated longer. On the other hand, non-pressurized balls are solid, which keeps them from deflating. However, non-pressurized tennis balls wear and tear at a quicker rate than pressurized balls.
Can a dog poop out a tennis ball?
Tennis balls are made of synthetic materials like rubber and plastic, and these cannot be digested by the body. This means that if they are swallowed and enter the gut, they will have to come back out whole. They will come back out either via the mouth or at the other end!
Can puppies play with tennis balls?
Since dogs have such a strong bite, they can squeeze the ball hard enough to split it open. This can lead to airway or intestinal blockage, which are both emergency, life-threatening situations. Even small dogs who can't completely hold tennis balls are at risk.
Why do tennis balls have fuzz?
The felt nylon, or fuzz, is a drag force on the ball. As air goes through the fuzz, the ball slows down, keeping it from going crazy fast! Additionally, when the tennis ball makes contact with a racket, it lightly grips the racket. All of these factors allow for more-controlled serves and returns from players.
How hot can a tennis ball get before it explodes?
At this time, compressed air of 18 psi fills the chamber. The combining of the half-shells trap the pressurized air and the adhesive is cured during an eight-minute process that heats and cools the core. If not cooled to at least 127 degrees Fahrenheit, the cores would explode upon opening the machine, Dillon says.
How do they make rubber balls?
In this How It's Made video from the Science Channel, factory workers create an inflatable rubber bladder that's shaped into a sphere. It's coated with nylon thread and covered with another layer of rubber strips. The balls are then heated, branded, and decorated to look like traditional basketballs.
Why is the tennis ball yellow?
So the International Tennis Federation (ITF) undertook a study that found that yellow tennis balls were easier for home viewers to see on their screens. An official 1972 ITF rule change required that all regulation balls have a uniform surface and be white or yellow in color.
How do you make a tennis ball?
The ball is placed in a moulding press and heated, curing together the rubber solution on the core and that on the back of the cloth. The heat and pressure also cure the rubber solution in the join between the two covers and moulds it into a smooth seam. The moulded ball is cooled and removed from the press.
Who makes the fuzzy stuff on tennis balls?
AltruCell Corporation is a company that is well known for its production of "the fuzzy stuff on tennis balls".
What colors can dogs see?
Dogs possess only two types of cones and can only discern blue and yellow - this limited color perception is called dichromatic vision.
Why is my dog obsessed with tennis balls?
The felt on a tennis balls means that they get a very personal scent from the dogs mouth too, and they can smell that it's their very own ball. And as we have explained earlier the erratic nature of the tennis ball bounce mimics their ancestors prey while the felt give the appearance of animal 'skin'.
Why does my dog eat tennis balls?
Whether it is due to anxiety, compulsive chewing, or just a way to alleviate boredom, dogs everywhere find their way into tearing tennis balls up all over the yard. These fixations can often come from everyday games.
Why do tennis players reject balls?
It all comes down to hair. The hair on a new tennis ball tends to be smoothed flat, while a ball that's been knocked around a bit will be more fluffy. Tennis players may check three balls or more before serving so that they can select one smooth ball and one fluffy ball. The smooth ball is used for the first serve.
Is the tennis ball green?
While tennis balls can be any color, if they're being used in professional competition, they're supposed to be yellow. The International Tennis Federation made that rule in 1972, and they've stayed that way ever since.
How long do tennis balls last?
Playing at a recreational level, a can of pressurised tennis balls will last anywhere between 1-4 weeks of light to moderate play. If used for competitive tennis, a pressurised set of tennis balls might last as little as 1-3 hours. Pressureless tennis balls can last 1 year and maybe even longer.
Do tennis balls rot?
Did you know that a tennis ball takes 400 years to decompose? Nationwide, approximately 125 million used tennis balls wind up in America's landfills every year. That is 20,000 metric tons of methane-producing, near non-decomposable rubber waste.