What did the 24-hour test show?
A gold-coloured metal clasp submitted by Yiwu Jinming Jewelry Co., Ltd. received an appearance rating of 10/10 after 24 hours of continuous neutral salt spray testing. The report recorded no visible defects under the stated inspection conditions. Its formal conclusion was “Not evaluated”, so this is an observed test result—not a laboratory PASS conclusion.
Conditions recorded in Jinming's report
The values below are transcribed from third-party report RTS260826M6796SL. They describe this test only and should not be treated as a universal specification for every jewelry product.
| Parameter | Reported value |
|---|---|
| Test method | ISO 9227:2022 · Neutral Salt Spray (NSS) |
| Sample | Gold-coloured metal clasp |
| Exposure | Continuous spray for 24 hours |
| Salt solution | 5% sodium chloride |
| Collected solution pH | 6.9 |
| Test chamber temperature | 35°C |
| Saturated air tower temperature | 48°C |
| Saturated air pressure | 98 kPa |
| Salt-spray collection rate | 1.5 mL / 80 cm² / h |
| Specimen angle | 21° |
Actual result and the correct interpretation
The report compared appearance before and after exposure and assigned the sample 10/10 with reference to ISO 10289:1999. The after-test photograph did not show visible defects under the report's stated inspection conditions.
The report did not include a buyer-supplied acceptance criterion and therefore recorded the conclusion as “Not evaluated”. Jinming is publishing the measured conditions and appearance result exactly as reported rather than converting that wording into a certification claim.
This result applies only to the identified sample and conditions. It does not certify all Jinming products, every coating system or every production batch.
View the supporting documents
The original laboratory report is published alongside an English reference translation so overseas buyers can review the method and result more easily.
The English file is an English reference translation—not a laboratory-issued or certified translation. The original report remains the controlling document.
Historical 72-hour sample record — 2021
After 72 hours, the visual inspection recorded “No visible corrosion” for both specimens 1# and 2#. This is the observed appearance result in the supplied record, not a blanket PASS claim for all Jinming products.
Report A2210367143101001C, dated 14 September 2021, names Shenzhen Hengyexin Technology Co., Ltd. as the report recipient and Yiwu Jinming Jewelry Co., Ltd. as the material provider for testing. The sample is described as stainless steel jewelry; this record does not establish a specific steel grade or coating thickness.
Document status: the source is marked Draft. The file below is an English reference translation, not an English report issued or certified by CTI. The draft markings and source acknowledgements remain visible.
| Test method | GB/T 10125-2012 |
|---|---|
| Sample | Stainless steel jewelry; specimens 1# and 2# |
| Exposure | 72 h |
| Salt solution | NaCl: (50 ± 5) g/L |
| Collected solution pH | 6.5–7.2 |
| Test chamber temperature | 35°C |
| Saturated air tower temperature | 47°C |
| Salt-spray collection rate | (1.0–2.0) mL/(h·80 cm²) |
| Specimen angle | Approximately 20° from vertical |
View the complete 72-hour English reference (Draft)
This 2021 record and the 24-hour RTS report above concern separate tests. They do not demonstrate the same sample progressing from 24 to 72 hours, three times the wear life, or the performance of current production batches.
Why jewelry buyers ask for salt spray testing
Salt spray testing is an accelerated corrosion-screening method. Buyers may use it to compare finishes, check a production sample against an agreed requirement or investigate whether a metal component shows visible corrosion under controlled saline exposure.
It does not convert directly into a guaranteed number of months or years of normal wear. Real jewelry use also involves abrasion, cosmetics, sweat chemistry, cleaning products, storage and individual wearing habits. Test duration, sample preparation, inspection rules and acceptance criteria therefore need to be agreed before testing.
How a neutral salt spray test is carried out
The process demonstration below shows the practical sequence: inspect and clean the sample, prepare the saline solution, confirm the pH, place and angle the sample, set the chamber conditions, begin continuous spray, record the exposure and finally rinse, dry and inspect the sample.
Neutral salt spray test process illustration. Video source: Zhaolong Interconnect.
This third-party video is included solely to illustrate the general operating process. The laboratory that tested Jinming’s sample operates the test inside a closed chamber and did not permit on-site video recording. This video does not show Jinming’s sample and was not recorded by Zhejiang RTS Test Co., Ltd. Actual conditions and results are documented in report RTS260826M6796SL.
What buyers should specify before requesting this test
- The exact product, component, base material and finish to be tested.
- The test method, solution, duration and any sample-conditioning requirement.
- The inspection method and visible defects that count as failure.
- Whether the request applies to a development sample, approved sample or production batch.
- The destination market and any brand-specific restricted-substance or durability protocol.
What this test does not prove
A salt spray result is not a substitute for nickel-release, lead, cadmium or other restricted-substance testing. It also does not by itself prove coating thickness, base-metal grade or a fixed real-world wear life. Those questions require their own documents, measurements or agreed test methods.
Frequently asked questions
Does a 24-hour salt spray result guarantee how long jewelry will last?
No. It records performance under one controlled accelerated test. Real wear depends on the product, coating, abrasion, chemicals, storage and user habits.
Was the 24-hour report concluded as PASS?
No formal PASS conclusion was given. The report recorded an appearance rating of 10/10 and listed the conclusion as “Not evaluated” because no acceptance criterion was supplied.
Can a buyer request salt spray testing for a specific order?
Yes. The product, sample stage, method, duration, inspection rule and acceptance criterion should be confirmed before the laboratory submission.