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Engineering Calculator · 080

Moulding Shrinkage Allowance Calculator

Estimate final moulded dimension and dimensional allowance from mould dimension and an entered linear shrinkage percentage.

Thermal & material change
Start calculationReview the method

Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Estimated final dimension19.7mm
Dimensional allowance0.3mm
Entered shrinkage1.5%

Formula
Lmoulded=Lm(1−sm)L_{\mathrm{moulded}}=L_m(1-s_m)

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

Estimate final moulded dimension and dimensional allowance from mould dimension and an entered linear shrinkage percentage. The relationship Lfinal = Lmould(1 − s) ties mould dimension and entered shrinkage directly to the reported result. One uniform linear shrinkage percentage applies to the measured direction. Treat the value as a transparent preliminary calculation, then compare it with the actual cable-entry assembly and current product documentation.

Moulding Shrinkage Allowance Calculator engineering relationship diagramLfinal = Lmould(1 − s) defines the calculation shown here. One uniform linear shrinkage percentage applies to the measured direction. Keep the entered units with the result so another reviewer can reproduce the method. This dedicated schematic represents moulding shrinkage and is not to scale.MOULDED DIMENSION · TOOL 080Mould dimensionEstimated final dimension
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

Lfinal = Lmould(1 − s) defines the calculation shown here. One uniform linear shrinkage percentage applies to the measured direction. Keep the entered units with the result so another reviewer can reproduce the method.

Calculation relationship
Lmoulded=Lm(1−sm)L_{\mathrm{moulded}}=L_m(1-s_m)

Lfinal = Lmould(1 − s) defines the calculation shown here. One uniform linear shrinkage percentage applies to the measured direction. Keep the entered units with the result so another reviewer can reproduce the method.

Variables

LmouldMould dimensionmm
LfinalEstimated final dimensionmm
ΔLDimensional allowancemm

Use sequence

From measurement to review

  1. Confirm mould dimension and entered shrinkage from a controlled drawing, measurement or project document.
  2. Apply Lfinal = Lmould(1 − s) with consistent units and keep the entered values beside the result.
  3. Use estimated final dimension only after checking resin grade, fibre/additive content, flow direction, process settings, moisture and tool temperature.

Limits

What this calculation does not confirm

  • One uniform linear shrinkage percentage applies to the measured direction.
  • Inputs describe one defined operating or measurement condition and use mutually consistent units.
  • The result does not by itself confirm product suitability, standards compliance, ingress performance or installation approval.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceHow does the moulding shrinkage allowance calculator calculate estimated final dimension?

The tool applies Lfinal = Lmould(1 − s) to mould dimension, entered shrinkage. One uniform linear shrinkage percentage applies to the measured direction. Keep the displayed units with the result so the calculation can be repeated.

02Calculator guidanceWhat does estimated final dimension show for this moulded dimension review?

Estimate final moulded dimension and dimensional allowance from mould dimension and an entered linear shrinkage percentage. It is a preliminary engineering value, not confirmation of a cable-gland model, standards compliance or installation approval.

03Calculator guidanceWhat should be checked about resin grade before using the moulding shrinkage allowance calculator result?

The equation does not model resin grade, fibre/additive content, flow direction, process settings, moisture and tool temperature. Confirm those conditions against the actual cable-entry assembly, applicable requirement and current product documentation.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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