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ENVIRONMENTAL RELIABILITY LAB
Damp Heat Cyclic Testing
IS 9000 PART V SEC 1&2 · IEC 60068-2-30 · MIL-STD-810G
CYCLIC HUMIDITY & CONDENSATION COMPLIANCE TESTING
DAMP HEAT
STATUS
≥95% RH
CAPABILITY
IS / IEC / MIL-STD
● OPERATIONAL
DAMP HEAT LAB SPECS
≥95% RH
MAXIMUM RELATIVE
HUMIDITY
1000mm³
MAXIMUM CHAMBER
VOLUME
3 STANDARDS
IS, IEC &
MIL-STD COMPLIANT
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Moisture, Humidity, & Condensation Resistance
Damp Heat Cyclic Test of Products in High Humidity Environments
The Damp Heat Cyclic Test is an essential environmental test designed to assess a product’s resistance to moisture, humidity, and condensation—factors that are critical in determining the long-term performance and reliability of equipment exposed to variable outdoor or semi-controlled environments. This test plays a pivotal role in industries such as aerospace, defense, telecommunications, automotive, consumer electronics, and renewable energy, where products are often subjected to fluctuating climatic conditions.As the name suggests, the test involves cyclic exposure to high humidity and elevated temperatures, simulating real-world conditions such as dew formation, rainfall followed by warming, or general tropical environments. The purpose is to detect failures due to corrosion, insulation degradation, material swelling, and moisture ingress, particularly in products that are sealed, semi-sealed, or have potential pathways for moisture penetration.Environmental stressors like temperature fluctuations and high humidity can significantly impact the reliability of electronic components, mechanical assemblies, and composite materials.
Over time, the ingress of moisture can cause:
- Corrosion of metal parts and circuit boards
- Degradation of insulation resistance
- Delamination of PCB layers
- Reduced dielectric strength of insulating materials
- Fogging or malfunctioning of optical devices
- Changes in mechanical properties of plastics and rubbers
By subjecting products to controlled damp heat cycles, manufacturers can identify weak points in design or material compatibility before the product reaches the market. This not only improves product safety and performance but also reduces the risk of field failures, warranty claims, and recalls.
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SPECIFICATIONS & METHODOLOGY
Test Methodology, Equipment Specifications & Standards.
The test is structured in repeating daily cycles and generally adheres to international standards, such as MIL-STD-810G, which is widely accepted in military and commercial product validation. Two major cycle variations are employed:
CYCLE TYPE 1
Moisture Penetration through Breathing
This cycle is optimized for products that experience internal moisture changes due to breathing effects—pressure differences caused by temperature changes which allow moisture-laden air to enter and condense inside the product enclosure. These are typically observed in sealed electronic modules, sensors, and enclosures.This cycle includes a controlled rise in temperature and humidity, followed by a gradual or rapid cooling phase, allowing condensation to form on and within the specimen, thereby revealing the risk of corrosion or failure due to moisture.
CYCLE TYPE 2
General Purpose Reproducible Cycle
This is a more standardized and reproducible version of the test, commonly used for a wide variety of general specimens including PCBs, mechanical subassemblies, and plastic-encased devices. It offers excellent repeatability and is suitable for baseline qualification testing.Each cycle generally lasts 24 hours, and multiple cycles are performed depending on the test objectives. Typical test sets may include 1, 2, 6, or more cycles, based on industry-specific requirements and the severity of environmental exposure simulated.
STANDARD TEST CONDITIONS
Parameters & Tolerances
Test Temperatures: Lower limit: 40°C, Higher limit: 55°CRelative Humidity (RH): Constant or cycling to ≥95% RHCycle Duration: 1 cycle = 24 hours (Test duration varies from a single cycle to multiple cycles based on standards or client requirements.)This test is frequently paired with thermal cycling, salt spray testing, and vibration to provide a comprehensive reliability profile of the product under investigation.
TEST EQUIPMENT SPECIFICATIONS
Environmental Chamber Capabilities
Temperature Range: From -40°C to +85°C, allowing for the integration of additional thermal cycling tests if needed.Humidity Range: Capable of maintaining ≥95% RH, even at elevated temperatures, simulating highly humid tropical or marine climates.Maximum Chamber Size: Up to 1000 x 1000 x 1000 mm, accommodating small components to mid-sized assemblies or systems.These chambers are equipped with precise humidity sensors, automated control systems, and data logging interfaces, ensuring that the environmental conditions remain consistent and traceable throughout the test.
STANDARDS FOLLOWED:
IS 9000 Part V Sec 1&2
IEC 60068-2-30
MIL-STD-810G
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APPLICATIONS
Applications of Damp Heat Cyclic Testing
TELECOMMUNICATIONS
Telecommunications
Testing outdoor base stations, antennas, and fiber-optic equipment for environmental robustness
DEFENSE & AEROSPACE
Defense and Aerospace
Qualification of avionics, navigation systems, and sealed military-grade electronics
AUTOMOTIVE
Automotive
Validation of electronic control units (ECUs), sensors, and dashboard components in humid, fluctuating climates
CONSUMER ELECTRONICS
Consumer Electronics
Ensuring the reliability of mobile devices, wearables, and smart home equipment under environmental stress
ENERGY & RENEWABLES
Energy and Renewables
Evaluating solar inverters, battery storage systems, and smart grid modules deployed in challenging outdoor conditions
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