The Importance of Using the Correct Seals During an IPX6 Test
What is IPX6 Testing used for?
IPX6 testing is used to verify whether an enclosure can resist powerful water jets from any direction without harmful water ingress. Under IEC 60529, the test typically uses a 12.5 mm nozzle, a water flow rate of 100 L/min, a distance of 2.5–3 m, and a minimum duration of three minutes.
Because the test applies a significant water force, the performance of seals, gaskets, and interface joints is critical to maintaining enclosure integrity. A poorly chosen or incorrectly installed seal can lead to leakage of water into the product.
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Case Background
A manufacturer of an outdoor PC server requested an accredited test for IPX6 to be performed. The enclosure was coated with mild steel and screwed together with a gasket. The product also had data cable gaskets and a breather hole.
During pre-compliance testing, the product was exposed to the required powerful water jets from all directions for 3 minutes,
Post test, inspection found water droplets inside the enclosure near the cable-entry area and breather holes. The ingress of the water did not accumulate on cables, connectors or any parts that would cause a safety concern, although this was deemed as a pass. The customer required no water entry at all to the product, and so wanted an investigation.
Root Cause Analysis plus Corrective Action and Retest
The investigation showed that the enclosure gasket was not quite sitting correctly in its groove, and during the assessment, water was forced against the enclosure with enough momentum to exploit small gaps at corners and fastening points.
The product had to be disassembled and reworked with an alternative gasket material; a repeat IPX6 test was then performed under the same conditions. This time, the enclosure showed no harmful water ingress. The retest confirmed that seal material, geometry, compression set, and installation consistency are all essential factors in achieving repeatable IP performance.
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Lessons Learned
This case study highlights that seals should never be treated as minor accessories in enclosure design. For IPX6 performance, the correct seal must be selected based on material compatibility, compression behaviour, environmental exposure, and interface geometry.
Even when the enclosure body is well designed, the use of an incorrect gasket can create failure paths that only become visible under the high-force conditions of a water jet test. Manufacturers that control seal specification, supplier quality, and assembly consistency are more likely to pass testing on the first attempt.
