Surface resistivity Explained for Thick Gauge Buyers – Food Contact Parts

In vacuum forming and thermoforming, surface resistivity is one of the variables that decides whether a part comes off the machine within tolerance or has to be reworked. This entry explains what it means, the ranges that are realistic on production tooling, and what to ask for when the part is quoted.

What it affects

The main effects are on wall thickness, cycle time and how much hand work the part needs after forming. On a thick gauge part these three decide the piece price, so the decision taken here shows up in every release afterwards.

Typical values

How it is controlled

1. Drawings are reviewed and a manufacturability report is issued with wall thickness, draft and radii marked up.
2. The part cools on a jig so the shape is held while the material stabilises.
3. Trimming is done on 5-axis routers or with a dedicated trim fixture to meet the drawing.
4. The sheet is formed over the mould with vacuum and, where the draw is deep, with plug assist.
5. Tooling is cut: aluminium for production volumes, composite or printed moulds for samples and first articles.

Common mistakes

• add ribs or returns instead of increasing sheet thickness to save weight and cycle time
• avoid sharp steps in the mould, which show as chill marks on the finished surface
• plan the trim line on a flat face so the router can hold tolerance
• use corner radii of at least three times the sheet thickness to avoid thinning

How to specify it on the drawing

Put the decision on the drawing rather than in an email: state the material and grade, the gauge, the finish, the surfaces that must not carry marks, and the tolerance that applies to the trimmed edges. Where the part has to mate with another component, mark the datum faces so the trim fixture and the inspection report use the same reference. A drawing that states these points removes most of the questions that otherwise surface during sampling.

Checklist before tooling is cut

• Material and grade fixed, including flame retardancy, UV or food contact requirements
• Gauge selected from the load case, not from habit
• Draft angle and corner radii checked against the sheet thickness
• Trim line placed on a face the router can reach
• Finish and colour standard agreed, with a reference if the colour is critical
• Inspection points agreed and noted for the dimensional report

Related terms

• Mould venting
• Wall thickness distribution
• 5 axis routing
• Nesting for trimming
• Mould texture
• Cooling jig

Frequently asked questions

Does this change the tooling cost?

Yes. Decisions taken at drawing stage move the tooling cost more than any later change, which is why the manufacturability review is done before the tool is cut.

What information do you need to advise on it?

A 3D file, the material if it is fixed, the annual quantity and the finish. With those the answer comes back with a recommended route and a quotation.