Equipment & Testing Capability | 4 E-Coating Lines + 11 Lab Instruments

PRODUCTION

Production capacity

Four lines with a clear division of labour: the automatic lines secure stability in volume, the manual lines keep sampling flexible.

3200㎡

Plant floor area

2lines

Automatic e-coat lines

2lines

Manual e-coat lines

11instruments

QC instruments across the process

Automatic e-coat line (2)

For high-volume, standardised orders: stable cycle time and good consistency
Bath parameters (solids, pH, temperature, conductivity) monitored and replenished automatically
Ultrafiltration keeps paint utilisation high and cuts waste and emissions
Baking and curing follow a zone-by-zone temperature curve for full cross-linking

Manual e-coat line (2)

For small batches, frequent changeovers and complex shapes at the sampling and pilot stage
Jigs and process parameters can be adjusted freely to suit complex geometry
Short sampling lead time: 3–5 working days after standard parts arrive
Pre-production pilot batches run here, lowering the risk of going to volume

TESTING LABORATORY

Laboratory instruments

We run a dedicated laboratory with 11 instruments covering the film thickness, colour difference, gloss, insulation resistance, dimensional imaging, abrasion, corrosion, damp heat and metallography tests used across our process. Testing turns experience into data: every batch is sampled at a set frequency and the results archived, which is where batch-to-batch consistency comes from. Swipe to browse; click an image to enlarge.

Coating thickness gauge: Fischer (Germany) DUALSCOPE DMP40, combining magnetic and eddy-current principles for non-destructive measurement of black cathodic e-coat dry film thickness; suits ferrous parts such as cold-rolled steel, galvanised steel and silicon steel, and aluminium parts such as die-cast and extruded aluminium — Coating thickness gaugeFischer DUALSCOPE DMP40 · Germany

Gloss meter: ZEHNTNER (Switzerland) ZGM1120, measuring surface gloss in GU on black e-coat films to distinguish matte black, semi-gloss black and gloss black finishes — Gloss meterZEHNTNER ZGM1120 · Switzerland

Spectrophotometer: KONICA MINOLTA (Japan) CM-700D, measuring colour difference ΔE and L*a*b* values on black e-coat films for comparison against the customer's master panel — SpectrophotometerKONICA MINOLTA CM-700D · Japan

Insulation resistance tester: Tonghui (Taiwan, China) TH9310 withstand-voltage and insulation tester, with DC high-voltage output to measure the insulation resistance of e-coat films; suited to motor stator cores that require inter-laminar insulation — Insulation resistance testerTonghui TH9310 · Taiwan, China

Coating tests Click to enlarge

Automatic vision measuring machineWanhao VMS-3020H · Taiwan, China

Temperature & humidity chamber: JIETE JTH-150L-4-CPA, providing a constant temperature and humidity environment for high-temperature/high-humidity storage and damp-heat cycling of e-coat films — Temperature & humidity chamberJIETE JTH-150L-4-CPA · China

RCA tape abrasion tester: NOMAN TOOL (United States) RCA tape abrasion machine, evaluating surface wear resistance of black e-coat films; a standard acceptance test for consumer-electronics parts — RCA tape abrasion testerNOMAN TOOL S/N 090693 · United States

Alcohol rub tester: AISRY ASR-56QQ, using reciprocating rubs with alcohol and other solvents to assess solvent resistance and wear resistance of e-coat films — Alcohol rub testerAISRY ASR-56QQ · China

Salt spray chamber: Quanyi (Taiwan, China) HL-60-SS, evaluating corrosion resistance of black e-coat films to the GB/T 10125 neutral salt spray standard — Salt spray chamberQuanyi HL-60-SS · Taiwan, China

Metallurgical microscope: Sunny Optical MX6R, examining cross-section thickness uniformity, pinholes and coating bonding in black e-coat films — Metallurgical microscopeSunny Optical MX6R · China

Automatic grinder-polisher: Laizhou Weiyi Mopao2B, used to grind and polish metallographic cross-section specimens of e-coat films — Automatic grinder-polisherLaizhou Weiyi Mopao2B · China

Laboratory instrument list (11)

Swipe to see the full table →

Dongguan Xintai Metal Surface Treatment Co., Ltd. laboratory instrument list: instrument, brand and origin, model, test item and notes
Instrument	Brand (origin)	Model	Test item	Notes
Coating thickness gauge	Fischer (Germany)	DUALSCOPE DMP40	Coating thickness (μm)	Non-destructive measurement with automatic switching between the magnetic (ferrous) and eddy-current (non-ferrous) methods, so ferrous and aluminium substrates can be measured directly. Used to measure the dry film thickness of black cathodic e-coat, which governs salt-spray life and assembly tolerances.
Gloss meter	ZEHNTNER (Switzerland)	ZGM1120	Gloss (GU)	Measures specular gloss on the coating under defined geometric conditions, separating matte black, semi-gloss black and gloss black. It turns 'looks about the same' into a GU number, so the same part keeps a consistent appearance across batches and across lines.
Spectrophotometer	KONICA MINOLTA (Japan)	CM-700D	Colour difference ΔE / Lab*	Measures colour difference ΔE and Lab* values against the customer's master panel. Consumer-electronics customers often require no visible colour variation between parts in the same batch; the spectrophotometer turns that into a ΔE number.
Insulation resistance tester	Tonghui (Taiwan, China)	TH9310	Insulation resistance (MΩ)	DC high-voltage output for measuring the insulation resistance of the e-coat. Laminated silicon-steel cores need inter-laminar insulation after coating, typically reaching ≥10 MΩ at 500 V.
Automatic vision measuring machine	Wanhao (Taiwan, China)	VMS-3020H	Dimensions / hole positions / profile	Non-contact optical measurement of dimensions, hole positions, profile and angles. Small hardware runs in high volumes, and the vision system verifies critical dimensions and outline quickly in batch.
Temperature & humidity chamber	JIETE (China)	JTH-150L-4-CPA	Damp heat testing	Provides a constant temperature and humidity environment for high-temperature/high-humidity storage and damp-heat cycling. It checks whether the e-coat blisters, discolours or loses adhesion under damp heat.
RCA tape abrasion tester	NOMAN TOOL (United States)	S/N 090693	RCA tape abrasion	RCA tape abrasion testing to evaluate surface wear resistance. E-coated consumer-electronics housings and buttons are commonly required to survive a specified number of RCA cycles.
Alcohol rub tester	AISRY (China)	ASR-56QQ	Solvent / alcohol rub resistance	Reciprocating rub with alcohol or other solvents to assess solvent and wear resistance, matching the common acceptance requirement of 'no bare metal after a set number of alcohol rubs'.
Salt spray chamber	Quanyi (Taiwan, China)	HL-60-SS	Neutral salt spray NSS (GB/T 10125)	Neutral salt spray test NSS (GB/T 10125) to evaluate corrosion resistance. E-coated stainless steel and aluminium alloy parts reach 1,000 h or more; laminated silicon-steel cores about 48 h.
Metallurgical microscope	Sunny Optical (China)	MX6R	Coating microstructure	Examines coating cross-sections and surface morphology to check film uniformity, pinholes and bonding. It adds microscopic verification on top of macroscopic testing and works with the automatic grinder-polisher for sample preparation.
Automatic grinder-polisher	Laizhou Weiyi (China)	Mopao2B	Metallographic specimen preparation	Grinds and polishes metallographic specimens to prepare coating cross-sections, giving the microscope a sound sample so cross-section observations are reliable.

Test items and method standards

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Test item	Method / standard	Notes
Neutral salt spray test NSS	GB/T 10125	Evaluates corrosion resistance: 1,000 h+ on stainless steel / aluminium alloy, about 48 h on laminated silicon-steel cores
Insulation resistance test	Megohmmeter / high-resistance meter	For electrical and electronic parts needing insulation, reaching ≥10 MΩ at 500 V
Coating hardness	Pencil hardness GB/T 6739	Typically 2H or harder
Adhesion	Cross-cut test GB/T 9286	Typically grade 0
Impact resistance	Impact tester	Checks that the coating does not chip or crack under impact
Full visual inspection	Visual check under a standard light booth	Looks for sags, pinholes, orange peel, particles, colour deviation and similar defects

All instruments listed above are in routine use in our in-house laboratory, and test data is archived by batch for traceability. To confirm which tests and acceptance criteria cover your part, contact us for the test capability statement, or browse our certifications and product gallery.

QUALITY CONTROL

Quality control flow

From raw material intake to finished goods, every step has its own checkpoints and records.

1

Incoming inspection

Checks part appearance, quantity and incoming condition

2

First-article approval

Sampling parameters locked in; the first article is tested on every item

3

Bath check

Key parameters tested at set intervals and recorded

4

In-process sampling

Film thickness and appearance sampled during production

5

Final inspection

100% visual check plus sampled performance testing

6

Data archiving

Batch test data fully traceable

Three quality red lines we hold to

No cherry-picking at dispatch — consistency comes from process control, not from sorting the bad parts out afterwards
Traceable data — key parameters and test results are archived for every batch, so a problem can be traced back to its cause
Verify before committing — new substrates and new geometries are never judged on experience alone: sample first, then go to volume

TECHNICAL

Technical capability

Where does Xintai's technical edge show?

It comes down to three strengths:

Consistent film thickness: e-coat deposits under an electric field, so edges, cavities and seams are all covered and the thickness tolerance is controllable — something spraying cannot do.
Salt spray resistance: phosphate pre-treatment, a high-corrosion coating and full curing work together, giving 1,000 h+ on stainless steel / aluminium alloy and about 48 h on laminated silicon-steel cores.
Insulation resistance: electrical and electronic parts can be supplied at ≥10 MΩ (500 V), meeting electrical safety requirements.

What is technically difficult about handling several substrates?

Different metals arrive in very different surface states: stainless steel carries a dense passive film, die-cast aluminium brings porosity and release agent, MIM parts are porous at the surface, magnesium alloys are chemically very active and titanium alloys have a stable oxide film. The hard part is that pre-treatment cannot run one recipe for everything — degreasing, conditioning and phosphating or passivation formulations, together with their process windows, have to be adjusted per substrate. That is the core experience we have built across six substrate families.

How does e-coating perform environmentally?

E-coat paint is a water-borne coating. It contains no organic solvents and emits little VOC; with ultrafiltration recovering carry-over paint, utilisation reaches 90% or more, well above the 50% typical of spraying. The company holds ISO 14001 environmental management system certification and a pollutant discharge permit, and runs wastewater and exhaust treatment to specification. Certificates and permits are listed on the Company page · Certifications.

FAQ

Equipment & testing FAQ

Why use imported instruments?

Because e-coat quality disputes tend to happen in the grey zone where everything 'looks about the same'. The value of imported instruments is measurement accuracy and repeatability — the same part measured at different times by different operators gives the same reading, so the number can serve as a basis both sides accept, instead of arguing over 'you say it passes, I say it fails'.

Can you provide third-party test reports?

Yes. For items that need third-party reports — salt spray, insulation resistance, RoHS and so on — we can submit samples ourselves or have the customer's nominated laboratory do the testing. Before volume production we recommend fixing the test standard and acceptance criteria in the technical requirements.

Is there a quality difference between the automatic and manual lines?

The quality standard is identical; the difference is in where each is used: the automatic line wins on stable cycle time, consistency at volume and minimal manual intervention; the manual line wins on flexibility, handling complex shapes, small batches and frequent changeovers. Both lines use the same bath control standard and the same test standard, and final inspection requirements are identical.

Can we visit the plant?

Visitors are welcome for a plant audit. Please book by phone one working day in advance so we can arrange reception and a shop-floor route. Address: Room 501, Building 3, No. 252 Dalang Shuixin Road, Dalang Town, Dongguan, Guangdong, China. Appointments: +86 181 2376 0267 (Mr. Huang).

Equipment & Lab