Void Content (Porosity) Calculator

What is Void Content (Porosity)?

Void content (porosity, V_v) is the percentage of void volume in the total volume of composite material. It is a critical quality index for carbon fiber, glass fiber, and aramid composites, directly affecting mechanical properties and structural performance.

Calculation Formula (ASTM D2734 Standard)

Where:
• V_v = Void Content (Porosity) %
• ρ_t = Theoretical Density (g/cm³)
• ρ_m = Measured Apparent Density (g/cm³)

Enter Values

Theoretical Density ρt (g/cm³) Measured Density ρm (g/cm³) Calculate Void Content

Typical Industry Standard

• Aerospace grade composites: Void content ≤ 1%
• Industrial structural composites: Void content ≤ 2%
• General non-structural composites: Void content ≤ 5%

Applications in Engineering

• Composite material quality inspection and testing
• Manufacturing process optimization (curing, molding)
• Mechanical property prediction and validation
• Aerospace/automotive composite certification
• Burn-off & Archimedes' test data analysis