Two Standards for Squash Balls

Squash is a racquet sport played by two or four players in a four-walled court with a small, hollow rubber ball. The players must alternate in striking the ball with their racquet and hit the ball onto the playable surfaces of the four walls of the court.

The ball equipment for squash has two types of balls, one for competition and one for club games. The balls are fairly similar with only minor details in differences.

1. A STANDARD DOUBLE YELLOW DOT (Competition) BALL

The following specification is the standard for a double yellow dot (Competition) ball to be used under the Rules of Squash.

Diameter (millimetres) 40.0 + or – 0.5
Weight (grams) 24.0 + or – 1.0
Stiffness (N/mm) @ 23 degrees C. 3.2 + or – 0.4
Seam Strength (N/mm) 6.0 minimum
Rebound Resilience – from 254 centimetres
@ 23 degrees C. 12% minimum
@ 45 degrees C. 25% – 30%

2. A STANDARD SINGLE YELLOW DOT (Club) BALL

The following specification is the standard for a single yellow dot (Club) ball to be used under the Rules of Squash.

Diameter (millimetres) 40.0 + or – 0.5
Weight (grams) 24.0 + or – 1.0
Stiffness (N/mm) @ 23 degrees C. 3.2 + or – 0.4
Seam Strength (N/mm) 6.0 minimum
Rebound Resilience – from 254 centimeters
@ 23 degrees C. 15% minimum
@ 45 degrees C. 30% – 35%

References: 
World Squash Specifications – http://www.worldsquash.org/ws/wp-content/uploads/2013/04/130218_Ball-Specifications.pdf
Photo – http://www.birminghamfuture.co.uk/sports/

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