How to Measure Powder Coating Thickness with UNI-T UT343D Malaysia

How to Measure Powder Coating Thickness with UNI-T UT343D Malaysia

Powder coating thickness is an important quality-control parameter for metal fabrication, electrical enclosures, machinery parts, steel structures and industrial components.

If the coating is too thin, the required surface protection or finish may not be achieved. If it is unnecessarily thick, coating material may be wasted and consistency may become more difficult to control.

The UNI-T UT343D Coating Thickness Gauge provides a convenient non-destructive method for checking coating thickness on suitable ferrous (Fe) and non-ferrous (NFe) metal substrates.

What Can the UNI-T UT343D Measure?

The UT343D has a coating thickness measurement range of:

0–1250 μm

It can be used on suitable:

Fe substrates – such as iron and steel.

NFe substrates – such as aluminium and other compatible non-ferrous conductive metals.

This makes it suitable for many common powder-coated industrial products.

Typical Powder Coating Applications

The UT343D can be considered for checking coating thickness on products such as:

Electrical cabinets

Control panels

Metal enclosures

Steel frames

Aluminium frames

Machinery covers

Fabricated brackets

Metal furniture

Equipment housings

Powder-coated automotive components

For production environments, the gauge can be used for incoming inspection, in-process QC and finished-product inspection.

Why Measure Powder Coating Thickness?

Visual inspection alone cannot reliably determine coating thickness.

Two components may look similar while having different coating thicknesses.

Measurement allows the QC team to work with actual numerical data.

This can help identify:

Thin coating areas

Excessively thick areas

Variation across a component

Inconsistent production batches

Differences between suppliers

Process changes over time

The target thickness should be determined from the coating specification, customer requirement or applicable production standard rather than from a universal value.

Step 1 – Identify the Substrate

Before measuring, identify the base metal.

For example:

Powder coating on mild steel → Fe

Powder coating on aluminium → NFe

This matters because coating thickness gauges use different measurement principles depending on the substrate.

The UT343D supports both Fe and NFe applications, making it useful when a factory handles different types of metal components.

Step 2 – Check the Measurement Surface

The measurement location should be suitable for good probe contact.

Where possible, avoid areas with:

Loose dirt

Metal chips

Heavy contamination

Extremely rough surfaces

Unstable probe contact

Place the probe correctly against the surface and avoid unnecessary movement during measurement.

Consistent measuring technique helps improve repeatability.

Step 3 – Do Not Measure Only One Point

A single reading does not necessarily represent the whole component.

For example, when inspecting a powder-coated electrical cabinet, measurements may be taken at several positions:

Top → Centre → Bottom

and

Left → Centre → Right

For larger components, increase the number of measurement locations according to the inspection requirement.

The objective is to understand coating consistency across the component.

Step 4 – Compare the Results with Your Specification

Once measurements are taken, compare the results against the required coating thickness range.

For example, a factory may have its own:

Customer specification

Internal QC specification

Coating supplier recommendation

Product requirement

Applicable standard

Avoid assuming that one coating thickness specification applies to every product.

Different coating systems and applications can have different requirements.

Step 5 – Investigate Abnormal Readings

If one location produces a significantly different reading, do not immediately reject the component.

Repeat the measurement.

Then check nearby locations.

If the difference remains consistent, investigate possible causes such as:

Uneven powder application

Gun distance or angle

Part geometry

Faraday cage effects

Surface preparation

Curing process

Rework or recoating

Operator technique

The coating thickness gauge helps identify the problem area. Determining the root cause may require further process investigation.

Using UT343D for Production QC

For repetitive production, coating thickness measurement can be incorporated into the QC workflow.

A simple process may look like:

Production → Powder Coating → Curing → Thickness Inspection → Record → Accept / Investigate

Instead of checking only when a customer complains, regular measurement allows coating variation to be identified earlier.

This can be especially useful for companies producing repeated batches of similar components.

Incoming Inspection

The UT343D can also be useful when your company does not perform the coating internally.

For example, a metal fabrication company may outsource powder coating to another supplier.

When the parts return, the QC team can perform incoming checks.

This provides objective measurement data when discussing coating quality with the supplier.

Supplier Comparison

If several coating suppliers are being evaluated, measurement records can help compare coating consistency.

Instead of saying:

“Supplier A looks better.”

the QC team can collect actual thickness readings from representative samples.

Other quality factors still need to be considered, but coating thickness becomes a measurable parameter.

Data Storage for QC Work

The UNI-T UT343D can store up to 500 groups of measurement data.

This is useful when checking multiple components or multiple locations.

For industrial users, measurement records can support:

Batch inspection

Internal QC documentation

Supplier evaluation

Production troubleshooting

Process improvement

Customer quality discussions

USB and PC Software

The UT343D also supports USB communication and PC software.

This makes it more suitable for users who need measurement records rather than simply checking one or two points and reading the result from the screen.

For factories, documentation can be just as important as the measurement itself.

Setting Upper and Lower Limits

For repetitive QC work, upper and lower limits can help operators identify measurements outside the selected range more quickly.

This is useful when many similar components are being inspected.

Instead of manually interpreting every reading, limit indication can make routine checking more efficient.

The actual limits should always be based on the relevant product or coating specification.

UT343D for Steel and Aluminium Components

One advantage of the UT343D is that the same instrument can cover suitable Fe and NFe applications.

For example, a fabrication company may manufacture:

Powder-coated mild-steel cabinet → Fe measurement

and

Powder-coated aluminium enclosure → NFe measurement

This makes the UT343D useful for factories working with multiple metal substrates.

Can UT343D Measure Before Powder Coating?

A coating thickness gauge is normally used to measure the coating after it has been applied to the appropriate metal substrate.

For production control before curing, other methods and instruments may be required depending on the process.

Always select the measurement method according to whether you need to inspect the coating before or after curing.

Common Measurement Mistakes

Several simple mistakes can produce inconsistent results.

Avoid:

Measuring only one location

Measuring on a contaminated surface

Ignoring substrate type

Holding the probe at an unstable angle

Comparing completely different component geometries

Using an incorrect reference or calibration procedure

Assuming every powder coating requires the same thickness

Good measurement practice is just as important as choosing the correct instrument.

Who Should Consider the UNI-T UT343D?

The UT343D is suitable for consideration by:

Powder coating factories

Metal fabrication companies

Electrical panel manufacturers

Machinery manufacturers

Automotive component suppliers

Aluminium fabricators

Engineering companies

QA/QC departments

Incoming inspection teams

Maintenance departments

With Fe/NFe capability, 0–1250 μm range, data storage and PC connectivity, it provides a practical solution for many routine industrial coating inspections.

Looking for UNI-T UT343D Coating Thickness Gauge in Malaysia?

MTM Precision Sdn Bhd supplies measuring and testing instruments for manufacturing, engineering, maintenance and quality-control applications in Malaysia.

If you are selecting a coating thickness gauge, tell us your:

Base material

Coating type

Expected thickness

Product being inspected

QC requirement

We can help you identify a suitable instrument for the application.

MTM Precision Sdn Bhd

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com

Website: www.mtmpre.com.my