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Sink Mark Depth Calculation

Designing plastic moldings light and strong often requires the use of strengthening ribs, the rib depth generally determines strength and stiffness of the structure. Where a molding provides asthetic and load bearing qualities, strength and surface finish are often incompatable. This is where Moldflow simulation technology can help optimise the design.

Sink mark visibility can be very subjective, and is often dependant on many factors such as lighting, surface texture and less tangible factors such as experience / expectation of the observer. Past research suggests that on textured surfaces sink mark depths of 0.040mm are generally not visible to the trained eye while sink marks deeper than 0.075 mm are evident even to the untrained eye. On high gloss surfaces sink marks less than 0.015 mm can be quite visible depending on light conditions.
Injection moulding Polymer Process Guide

Sink Mark Depth Simulation

The image above displays sink mark depth prediction based on a flat plate with wall thickness of 2.5 mm, on the "B surface" ribs with thickness variation from 0.8 mm to 2.5 mm as follows:-Injection moulding Polymer Process Guide

Sink Mark Depth Prediction


Table showing sink mark depth in "mm" Vs flow distance @ 70 Mpa hold - PP .

Rib No.






Sink 100 mm from the gate.






Sink 175 mm from the gate.






Sink 200 mm from the gate.






Pink shading indicates visible sink on a textured finish.

Factors effecting sink mark depth :

Rib / wall thickness ratio.

Hold time.

Fillet radii.

Melt temperature .

Distance from gate.

Tool temperature.

Straight ribs or cross ribs

Cooling time..

Hold pressure.

Material Crystaline / Amorphous .

For more information or a quotation please see our contact and RFQ pages.Injection moulding Polymer Process Guide
imtech design Moldflow Engineering Services

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Moldflow, Filling, Cooling, Warpage analysis, weld lines, flow lines, fiber orientation, polymer flow, rapra, part advisor
Moldflow, Filling, Cooling, Warpage analysis, weld lines, flow lines, fiber orientation, polymer flow, rapra, part advisor
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moldflow services
moulding analysis consultant
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