What Is Condensation?
The condensation test is one in which the sample surface is exposed to continuous condensation from water vapour in the chamber. It reveals moisture ingress under the coating and blistering.
Purpose of Condensation
The purpose is to verify that paint and coating systems maintain adhesion to the surface under continuous moisture.
Which Products Is Condensation Applied To?
- Paint and varnish systems
- Powder-coated surfaces
- Coated sheet metal parts
- Building components
In Which Sectors Is Condensation Used?
Standards Related to Condensation
- ISO 6270-1strength in condensation environment test
- ISO 6270-2strength in condensation environment test
- ASTM D4585
- ASTM D2247
Condensation Conditions
- Method
- Continuous condensation at ISO 6270-1; Controlled humidity environment in ISO 6270-2
- Temperature
- Defined in the standard; typically 40 °C
- Relative humidity
- Level enough to sustain condensation (close to 100%)
- Time
- Defined in the specification; typically 240 – 1000 hours
Equipment for Condensation
- Condensation chamber
- Pure water supply system
- Temperature and humidity control
- Adhesion and thickness measurement instruments
Sample Requirements for Condensation
- The coating must have fully cured
- Dry film thickness must be recorded
- Samples must be placed at the angle that induces condensation
- Generally at least three specimens
Duration of Condensation
Depends on the duration defined in the specification; typically 10 days to six weeks.
Condensation Procedure
- 1Coating thickness and initial condition are recorded.
- 2Chamber temperature and humidity conditions are verified.
- 3Samples are placed with the condensation surface facing upward.
- 4The conditions are maintained for the defined duration.
- 5At the end of the exposure, blistering, colour change and adhesion are assessed.
Condensation Acceptance Criteria
The acceptance criterion is given in the specification as blistering grade and minimum post-test adhesion strength.
Evaluation of Results
Blister size and density are graded per the standard's scale. A post-test adhesion measurement is usually required alongside.
Condensation Report
- Standard and method applied
- Temperature, humidity and duration
- Coating system and thickness
- Blistering grade and adhesion result
- Photographs
Accreditation
EUROLAB holds internationally recognised accreditation obtained from accreditation bodies party to the IAF and ILAC multilateral recognition arrangements, under ISO/IEC 17025 for laboratory testing, ISO/IEC 17020 for inspection and surveillance, and ISO/IEC 17021-1 and ISO/IEC 17065 for system and product certification. This chain ensures the reports and certificates issued are accepted worldwide.
Whether this test can be offered within accredited scope depends on your product and the standard applied; since accreditation is method-based, the scope is confirmed in writing at the quotation stage.
Scope and authorisationsRelated Regulations
- Paint and coating product specifications
Environmental and Climatic Testing — What Does This Testing Field Cover?
The section below describes the field that the Condensation test belongs to; the conditions and acceptance criteria of this particular test are given in the sections above. The scope specific to your product is confirmed in writing at the quotation stage.
Environmental testing shows whether a product withstands ambient factors such as temperature, humidity, pressure, solar radiation, dust, water and corrosive atmospheres. The aim is not to break the product but to bring forward, in ACCELERATED form, the conditions it will meet over its life.
Test profiles are derived from the product's real exposure, and that derivation is the actual engineering work of the field. A device operating in an enclosed office and one mounted on a pole are not tested with the same profile. The IEC 60068 series defines general methods, MIL-STD-810 military profiles, RTCA DO-160 aviation profiles and the ISO 16750 series location-based automotive profiles. A test applied without a profile selection produces both unnecessary cost and false confidence.
Temperature tests simulate three separate phenomena and all three produce different failure modes. Steady high/low temperature tests whether the material can operate at that temperature. Temperature CYCLING creates fatigue at joints between materials with different expansion coefficients — solder cracks appear here. Thermal SHOCK intensifies this effect through an abrupt transition.
There is a distinction in humidity testing too. Steady damp heat shows the diffusion of moisture into the material and its effect on insulation properties. Cyclic damp heat creates condensation: water droplets form on the cooling surface, and this is far more aggressive than dry humidity. Water ingress into enclosures, increased leakage current and corrosion usually appear in the cyclic test.
Dust and water protection is a separate body of work and is expressed by the IP code. The point to note here is that an IP test is not a DURABILITY test: it shows that protection is provided under defined and short-duration conditions, not resistance to long-term immersion or pressure washing.
The most common mistake in this family is translating a test result directly into a LIFE PREDICTION. Accelerated tests are designed for comparison and design verification; a reliable conversion between hours in a chamber and years in the field can only be established with a material-specific acceleration model calibrated against field data.
Functional monitoring determines the value of the test. Keeping a product in a temperature chamber and then switching it on does not show what happened DURING the test. In critical applications the product is operated throughout the test and its parameters are monitored; intermittent faults that appear and disappear can only be caught this way.
Method groups in this field
Temperature
Dry heat, cold, change of temperature and thermal shock; steady and cyclic profiles.
Humidity
Steady damp heat and cyclic damp heat; cycles with condensation are more aggressive.
Water and dust
IP protection tests: dripping, spraying, jets, immersion and dust tightness.
Radiation and ageing
Accelerated ageing by xenon arc and fluorescent UV, solar radiation simulation.
Pressure and altitude
Low pressure (altitude) and rapid pressure change tests.
Corrosive atmosphere
Salt spray, mixed flowing gas corrosion (simulating industrial atmospheres), mould and fungus tests.
Commonly confused in this field
- Test duration cannot be converted into field life; a conversion made without an acceleration model is misleading.
- Temperature cycling and steady temperature produce different failure modes; neither replaces the other.
- If the product is not operated during the test, intermittent faults remain invisible; functional monitoring determines the value of the test.
- IP protection is not evidence of durability; it shows protection under defined and short-duration conditions.
- A test applied without profile selection both increases cost and gives false confidence.
- The mounting and orientation arrangement affects the result; the report must document it.
Which decisions these results support
- Design verification and qualification
- Declaration of the protection class and operating temperature range
- Reproducing field failures in the laboratory and root cause analysis
- Supplier component approval
- Decisions on warranty period and storage conditions
Related Tests
Frequently Asked Questions About Condensation
According to which standard is Condensation made?
Condensation is executed in scope ISO 6270-1, ISO 6270-2, ASTM D4585 and ASTM D2247. The limit values and acceptance criteria to be applied are defined in the product standard; The version valid for your product is confirmed in writing at the offer stage.
Which products does Condensation apply to?
Mainly applied to Paint and varnish systems, Powder-coated surfaces, Coated sheet metal parts and Building components. Whether your product is included in the scope is determined by examining its technical specifications and intended use.
Under what conditions is Condensation done?
The determining parameters are: Method — Continuous condensation at ISO 6270-1; Controlled humidity environment in ISO 6270-2, Temperature — Defined in the standard; typically 40 °C and Relative humidity — Level enough to sustain condensation (close to 100%). The full terms are in the "Test Conditions" section on the page and vary depending on the product standard.
What kind of sample is needed for Condensation?
The coating must have fully cured, Dry film thickness must be recorded and Samples must be placed at the angle that induces condensation. The number of samples is determined according to the product standard and the scope to be reported.
How long does Condensation take?
Depends on the duration defined in the specification; typically 10 days to six weeks. This duration belongs to the experiment itself; sample preparation, queuing and reporting are also evaluated. A realistic schedule for your product is given in the offer.
What is the Condensation result called "appropriate"?
The acceptance criterion is given in the specification as blistering grade and minimum post-test adhesion strength.