ASTM · ISO Verified Engineering Calculators

Design With Confidence.Engineering Math, Made Transparent.

8 calibrated design engines for injection clamping force, Fourier cooling kinetics, shrinkage compensation, shear rate limits, and desiccant drying equilibrium.

Unit StandardISO 80000-1
Recent Runs:
✓ Formula Engines Verified

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8 Standard Tools

Clamping Force & Tonnage

ASTM D3641 / ISO 294-1

Calculate minimum press clamping tonnage required to prevent mold parting line flashing during peak injection pressure.

Read Theoretical Lesson →
ASTM D3641 Governing Equation
F = (A_total × P / 1000) × SF

Where A_total = Total projected area (A × N = 600 cm²), P = Cavity injection pressure (400 bar), SF = Safety Factor (1.1)

Tooling Presets
cm²

Typical range: 50–500 cm² per cavity part

cavities

Total Projected Area = 600 cm²

bar

PE/PP: 300–400 bar · ABS/PC: 450–650 bar · Thin-wall: 800+ bar

multiplier

Recommended: 1.10 (Standard) to 1.20 (Precision/Optical)

Calculated Tonnage
264TONNES

Theoretical: 240.0 T · Safety Factor: 1.1x

0 T264 T Target800 T
Recommended Press Size: 300 Tonnes

A 300T machine provides a safe operating buffer of 20%, ensuring tie-bar deflection remains within tolerance.

Engineering Verification & Assumptions

Uniform cavity pressure distribution across parting plane.

Machine platen parallelism verified to SPI Class 1.

For hot runners, add runner manifold projected area.

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