Measuring the Density of EPS Beads

 The density of Expanded Polystyrene (EPS) beads, commonly referred to as EPS beans, is calculated by dividing their mass by the volume they occupy. The result is typically expressed in kilograms per cubic meter (kg/m³). Follow these steps to measure it accurately:

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Procedure:

1. Materials Needed:

• A precision scale for measuring weight.
• A container with a defined volume, such as a graduated cylinder or a box with known dimensions.
• A method to fill the container evenly, ensuring the beads settle naturally without compression.

2. Weigh the Empty Container:

• Place the container on the scale and record its weight.

3. Fill the Container:

• Fill the container with EPS beads. Gently tap the container to allow the beads to settle without compacting them.

4. Weigh the Filled Container:

• Measure the total weight of the container with the EPS beads.

5. Determine the Weight of the EPS Beads:

• Subtract the weight of the empty container from the total weight to find the weight of the EPS beads.

6. Calculate the Density:

Density (kg/m³) = Weight of EPS beads (kg)/ Volume of container (m³)

Example Calculation:

Weight of empty container: 0.5 kg

Weight of filled container: 1.2 kg

Volume of container: 0.01 m³

Weight of EPS beads = 1.2 kg − 0.5 kg = 0.7 kg

Density = 0.7kg / 0.01m³ = 70 kg/m³

Important Points: The density of EPS beads depends on their degree of expansion and application, typically ranging from 5kg/m³ to 30 kg/m³ for standard EPS materials. Ensure a consistent method of filling the container to avoid inaccuracies. Avoid exposing the beads to moisture, as this could alter their weight and affect the density measurement.