Chloe Zhang
Table tennis balls were changed from celluloid to plastic in 2014. This change was implemented by the International Table Tennis Federation (ITTF) after several years of research and development. The new plastic balls have higher coefficients of restitution and friction than celluloid balls, resulting in less spin and more speed. This has caused players to alter their strategies and techniques, with some benefiting from the change and others struggling to adapt.
| Characteristics | Values |
|---|---|
| Date of change | 1 July 2014 |
| Reason for change | Safety concerns about the flammability of celluloid |
| New ball diameter | 4.00 ± 0.02 cm |
| Old ball diameter | 3.96 ± 0.00 cm |
| New ball mass | 2.726 ± 0.008 g |
| Old ball mass | 2.742 ± 0.007 g |
| New ball material | Acrylonitrile Butadiene Styrene (ABS) |
| Effect on game speed | Faster rallies |
| Effect on spin | Less spin |
| Effect on bounce | Higher bounce |
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What You'll Learn
Plastic balls are safer than celluloid
Plastic balls have replaced celluloid balls in table tennis, with the International Table Tennis Federation (ITTF) overseeing the transition. The ITTF introduced plastic balls at major events in 2014, phasing out celluloid balls. This shift occurred for several reasons, one of which was safety. Plastic balls are safer than celluloid due to their non-flammable nature, addressing the risk associated with celluloid's flammability.
Celluloid, a highly flammable material, posed safety concerns that drove the transition to plastic balls. The flammability of celluloid balls raised risks, especially when left in hot environments or during transportation and storage. Plastic balls, being non-flammable, eliminate these fire hazards, enhancing safety for players and the general public.
The production of celluloid balls also faced challenges due to strict safety regulations, particularly in Europe, which increased production costs. By 2020, celluloid production had ceased in Europe, with only two factories remaining globally, both located in China. The decline in celluloid production and the stringent safety standards made it impractical to continue using celluloid balls.
In contrast, plastic balls are made from readily available materials, which has contributed to a decrease in prices over time. The transition to plastic balls has resulted in a broader range of ball models, providing players with more options and allowing them to choose balls that align with their playing styles and strategies.
While the change to plastic balls in table tennis was influenced by safety considerations, it has also impacted the gameplay dynamics. Plastic balls have altered the way the game is played, with reduced spin and faster rallies. These changes have prompted players to adapt their techniques and strategies, emphasising the placement and recovery of the ball.
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Plastic balls are cheaper to produce
The switch from celluloid to plastic balls in table tennis occurred in 2014, with the International Table Tennis Federation (ITTF) phasing out the old celluloid balls over time. One of the reasons for this change was the decreasing demand for celluloid, which was being replaced by plastic in almost all other applications. This decline in demand meant that celluloid production became expensive, with strict safety regulations for its production in Europe. In fact, by 2020, celluloid production had ceased entirely in Europe, leaving only two factories in China producing the material solely for table tennis balls.
Plastic balls, on the other hand, are cheaper to produce. The introduction of Acrylonitrile Butadiene Styrene (ABS) plastic balls has made the game more accessible and affordable for players. ABS is a versatile copolymer that can be optimised for various purposes by adjusting the proportions of its three components. This flexibility in production allows for cost-effective manufacturing, making the balls more economical for both manufacturers and players.
The shift to plastic balls also brought about changes in gameplay dynamics. Plastic balls have higher coefficients of restitution and friction compared to celluloid balls, particularly when initial vertical velocities are higher. This results in plastic balls bouncing higher and flying faster, which has led to shorter rallies and a faster-paced game. Additionally, the decreased ability to produce spin with plastic balls has posed challenges for defensive players and those relying on heavy topspin techniques.
While the change to plastic balls offers economic benefits in terms of production costs, it has also received some criticism. Some players have expressed concerns about the decreased speed and spin achievable with plastic balls, arguing that it goes against the traditional nature of the sport. Moreover, the need for new setups due to the different characteristics of plastic balls has been mentioned as an additional expense. Nevertheless, the transition to plastic balls in table tennis has opened up opportunities for innovations in rubber technology, with the introduction of harder, spinnier rubbers to adapt to the new ball properties.
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Plastic balls have a higher post-collision trajectory
The material used in table tennis balls was officially changed from celluloid to plastic in 2014. This change was implemented by the International Table Tennis Federation (ITTF) after several years of research and development. The ITTF's key aim was to move away from celluloid due to growing safety concerns related to the flammability of the material.
The change in ball material has had a significant impact on the game, with some players benefiting from the new plastic balls while others have struggled to adapt. One of the most notable effects of the change is the difference in post-collision trajectories between celluloid and plastic balls. Plastic balls have been found to exhibit a higher trajectory after colliding with a table, which has resulted in changes to gameplay strategies.
The higher post-collision trajectory of plastic balls can be attributed to several factors. Firstly, plastic balls have higher coefficients of restitution when the initial vertical velocities are higher. This means that plastic balls retain more energy and bounce back higher after colliding with a surface compared to celluloid balls. Additionally, plastic balls have higher coefficients of friction when the initial horizontal contact point velocities are slower. This results in plastic balls experiencing more stops upon collision with the table, particularly when backspin techniques are employed.
The change in ball trajectory has had a significant impact on playing styles. Players who favour a fast attack game with minimal spin have found an advantage in the higher trajectory of plastic balls. By hitting the ball as soon as possible after the bounce, they can exploit the increased speed and reduced spin of plastic balls. On the other hand, defensive players who rely on backspin techniques have found themselves at a disadvantage as the increased number of stops upon collision with the table requires them to travel back and forth for greater distances.
While the change to plastic balls has brought about a range of challenges and opportunities for players, it is important to note that not all players have benefited equally. Some players, particularly those who relied on heavy topspin, have struggled to adapt to the new ball trajectory and have had to modify their techniques. Overall, the introduction of plastic balls has resulted in a faster game with shorter rallies, requiring players to develop new strategies and techniques to stay competitive.
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Plastic balls have less spin
The official material used in table tennis balls was changed from celluloid to plastic in 2014. This change was implemented by the International Table Tennis Federation (ITTF) after several years of research and development. The ITTF wanted to move away from celluloid due to growing safety concerns around the world—the flammability of the ball had become a risk.
The introduction of plastic balls has led to significant changes in the game. One of the most notable differences is the reduction in spin. Plastic balls have less spin compared to celluloid balls, which has impacted the playing strategies of many athletes. This is due to the higher coefficients of friction for plastic balls when the initial horizontal contact point velocities are slower. The behavior of the balls upon collision with the table also contributes to the reduced spin. When a player responds to a backspin ball with a backspin "stop" technique, the plastic ball experiences more stops upon collision with the table, causing longer rallies and a decrease in spin.
The change in spin dynamics has affected players who rely on heavy topspin or backspin in their gameplay. Timo Boll, a three-time Olympic medallist in table tennis, shared that the change in ball material reduced the impact of his heavy topspin playing style. Similarly, defensive players employing backspin strategies have faced challenges as the ball comes at them faster, giving them less time to react and execute their techniques.
The decrease in spin caused by plastic balls has resulted in rallies becoming faster and shorter. This shift in gameplay dynamics has led to the development of new rubber technologies. Harder and spinnier rubbers have been introduced to compensate for the reduced spin capabilities of plastic balls.
While the transition to plastic balls has presented challenges and advantages for different playing styles, it is important to note that the rules of the game remain unchanged. The rules specify the weight, diameter, and rebound characteristics of the ball, but they do not dictate the material composition.
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Plastic balls are faster
The material used in table tennis balls was officially changed from celluloid to plastic in 2014. This change has significantly altered the sport, with some players benefiting from the new balls and others struggling to adapt.
One of the most notable effects of the change is the increased speed of the ball. Plastic balls have a higher coefficient of restitution than celluloid balls, resulting in faster play and higher bounces. This is particularly advantageous for players who employ a fast attack style with minimal spin. For example, the new European champion from Budapest 2017, Lebesson from France, benefited from the characteristics of plastic balls.
The higher speed of plastic balls can be attributed to several factors. Firstly, plastic balls have a slightly larger diameter than celluloid balls, which contributes to their increased speed. Additionally, the seams on plastic balls may contribute to their higher speed, as seamless balls tend to have lower rebound heights.
Moreover, the characteristics of the ball trajectory after collision with a table differ between plastic and celluloid balls. The coefficients of friction are higher for plastic balls when the initial horizontal contact point velocities are slower. As a result, the ball trajectories of services with backspin and drives with topspin are expected to differ between the two types of balls.
While the change to plastic balls has increased the speed of the game, it has also reduced the amount of spin that players can impart on the ball. This has presented challenges for defensive players who rely on backspin defense and topspin players who attack from half-distance. These players have less time to react and must adapt their strategies and techniques to keep up with the faster pace of the game.
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Frequently asked questions
The ball material was changed from celluloid to plastic due to safety concerns. Celluloid is highly flammable, and with safety awareness growing worldwide, the flammability of the ball became a risk.
The change was implemented in 2014, with the ITTF (International Table Tennis Federation) phasing out celluloid balls at major events.
The plastic balls have less spin and more speed, resulting in shorter rallies. This has caused players to alter their strategies and techniques, with some players struggling to adapt.
The new plastic material is called ABS (Acrylonitrile Butadiene Styrene). It was chosen because it is a safe, inexpensive material that can be optimised for various purposes by varying the proportions of its components.
