85/85 Test (Temperature-Humidity Bias): What It Is & How It Works
An environmental chamber maintains 85°C and 85% relative humidity.85/85 Testing is a reliability test that measures the ability of electronic components and materials to withstand high temperatures and high humidity simultaneously. In this test method, the electronic devices are subjected to 85°C and 85% relative humidity (RH) for a specified period.
The 85/85 Test is a method for determining the performance of electronic devices and materials in the presence of moisture and high temperature over time. High temperature and high humidity are the two environmental factors that accelerate the degradation of the device and the materials. It is commonly employed to measure the durability and reliability of electronic devices.
The purpose of this test method is to measure the capacity of electronic devices and materials to withstand extreme environmental stress.
Why is 85/85 Testing Important?
The importance of the 85/85 test lies in the fact that temperature and humidity are two of the most critical environmental conditions for which electronic devices and materials are subjected.
Moisture and high temperature can cause metal corrosion, soldering failures, polymer swelling, and insulating material degradation. This accelerated aging test enables the manufacturer to predict the product’s long-term reliability.
The 85/85 test is conducted for quality assurance, product validation, and adherence to product standards under real-time operating conditions.
Which Materials Can Be Tested Under 85/85 Testing?
A wide variety of materials and products can be evaluated using the 85/85 test, particularly those used in electronic and electrical systems.
Examples include:
- Semiconductor devices
- Printed circuit boards (PCBs)
- Electronic modules and sensors
- Connectors and cables
- Encapsulation materials and polymer
- Protective coating and conformal Coating
These materials are tested to evaluate their resistance to moisture penetration, corrosion, and electrical degradation under combined heat and humidity exposure.
Which Industries Use 85/85 Testing?
The 85/85 reliability test is commonly employed in industries where electronic components and environmental durability are of utmost importance.
- Automotive Industry: Automotive electronics, which include sensors, controllers, and connectors, are subjected to 85/85 testing to ensure their performance in humid and high-temperature environments.
- Aerospace Industry: Aircraft electronic systems and avionics are subjected to extreme environmental conditions, and 85/85 testing is used to ensure the environmental durability of the electronic components used in these systems.
- Consumer electronics: Electronic components of consumer electronics, such as smartphones, laptops, and wearable electronics, are subjected to 85/85 testing to ensure their performance in humid and high-temperature environments.
- Renewable Energy Industry: Solar panels, solar inverters, and other electronic components in solar systems are exposed to high humidity and high temperatures, making 85/85 testing essential to assess their environmental durability.
- Telecommunications: Electronic components in telecommunication systems are subjected to varying environmental conditions, including high humidity, and 85/85 testing is used to ensure their performance under these conditions.
What Are the Standard Test Conditions?
Typical 85/85 test conditions include controlled environmental exposure in a climatic chamber. Maintaining stable test conditions ensures accurate simulation of accelerated environmental aging.
Key Properties Measured
The 85/85 test evaluates several important reliability properties, including:
- Moisture resistance
- Corrosion susceptibility
- Electrical insulation stability
- Material swelling or degradation
- Adhesion and coating durability
These properties help determine how electronic materials and components behave under combined heat and humidity stress.
Conclusion
The 85/85 test is critical for evaluating the durability and reliability of electronic components under extreme temperature and humidity conditions. By subjecting materials to extreme conditions in this test, manufacturers can identify potential failures early in their products’ life cycles.
The 85/85 test is a valuable tool for various industries, including automotive, aerospace, consumer electronics, telecommunications, and solar panels, to ensure that their products can perform in extreme conditions.
In conclusion, 85/85 testing is a proven test for validating product reliability, resistance to extreme environments, and durability.
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Frequently Asked Questions (FAQs)
What is the 85/85 test used for? The 85/85 test assesses how electronic components or materials perform in a condition of 85°C temperature and 85% relative humidity, aiding manufacturers in evaluating reliability, moisture resistance, and long-term durability in a certain environment.
Why is the 85/85 test important for electronics? This test detects potential failures caused by moisture entry, corrosion, insulation degradation, and material swelling. This test checks whether the electronic devices function correctly even in harsh environmental conditions.
How long does the 85/85 test usually last? The duration of 85/85 may vary from 500 to 1000 hours, depending on industry requirements or product requirements. Longer durations are also used to simulate environmental stress over extended periods.
What equipment is used for 85/85 testing? The 85/85 test is performed in a controlled environmental chamber that maintains 85°C temperature and 85% relative humidity, keeping samples under observation to assess their performance and detect any possible failure of materials.
Which industries rely on 85/85 testing? Some industries that use the 85/85 test include the automotive industry, aerospace industry, consumer electronics industry, telecommunications industry, renewable energy industry, semiconductor industry, and medical devices industry.
