Notes

Outline

Southern Impact Research Center, LLC ISO Guide 25 Accredited by the American Association of Laboratory Accreditation

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Youth Baseball Mechanical Properties and Recommended Performance Levels Presented by Dave Halstead October 2000 To the SGMA Baseball/Softball Meeting

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COR Following ASTM Standard Test Method F1887-98 on Nine Balls of Each Model and Compression Displacement (C-D) Tests Following ASTM Test Method F1888-98 on Three Balls of Each Model.

Additional Testing Was Performed on Selected Balls to Determine Potential Injury Risk From Head Impact Using NOCSAE Protocols

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Typical Constructions of the 43 “Youth” Baseballs Submitted  Yarn Wrapped Various Centers  Cork  None Were Solid Polymer Core Construction

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Typical Constructions of the seven (7) Low Compression Baseballs Submitted All Were Solid Polymer Core Construction

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Relationship of C-D to NOCSAE Severity Index Good Correlation Exists Between ASTM C-D Results and NOCSAE Severity Index

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Comparison of Youth Baseballs to Ball Used by MLB MLB Ball Has Lower C-D but Higher SI and Peak G

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Correlation of NOCSAE Proposed Stiffness Measure to SI and C-D NOCSAE Stiffness Shows Good Correlation With Low Compression Balls

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Recommendations for Performance Specifications  Low Compression Ball  Medium Compression Ball  High Compression Ball

Low Compression Balls For the Lowest Skill Level Players  COR between .45 - .55  C-D Not > 45 lbs.  Weight between Not > 5.25 oz  Circumference between 9 – 9.25 in.  Consider NOCSAE Level I

Medium Compression Balls for Players of Moderate Skill levels  COR between .50 - .55  C-D between 75 – 150 lbs.  Weight between 5 – 5.25 oz.  Circumference between 9 – 9.25 in.  Consider NOCSAE Level II

High Compression Balls For Advanced Skill Levels  COR between .50 - .55.  C-D between 200 – 350 lbs.  Weight between 5 – 5.25 oz.  Circumference between 9 – 9.25 in.  Continue to Specify Additional Requirements for Tournament Play.