Environmental Reliability | Temperature, Vibration, Salt Spray & Standards

Why does a perfectly working product fail in the field? Because "room temperature and stationary" in the lab is not the real world. Environmental testing creates "extreme but real" stress to surface hidden weaknesses early.

1. Main tests and their purpose

Stress	Simulates	Typical failures	Common standards
High / low temp	Extreme climate, self-heating	Semiconductor aging, material deformation, display/battery faults	IEC 60068-2-1/2, GB/T 2423
Humidity cycling	Day-night swing, coastal / rainy season	Corrosion, lost insulation, dendrite growth, leakage	IEC 60068-2-30, GB/T 2423.4
Vibration	Transport bumps, equipment running	Solder fatigue, cold solder, loose screws, broken wires	IEC 60068-2-6, MIL-STD-810
Mechanical shock	Drops, collisions, handling	Housing cracks, component detachment	IEC 60068-2-27
Salt spray	Coastal, industrial corrosion	Metal corrosion, coating failure, poor contact	ASTM B117, ISO 9227
IP protection	Dust, water spray / immersion	Seal failure, ingress	IEC 60529 (IP Code)

2. How to choose the standard

IEC 60068 series: the international baseline for environmental testing — the most common starting point for export.
GB/T 2423: China's national standard, largely equivalent to IEC 60068; widely used by domestic labs for reports.
MIL-STD-810: US military standard representing "rugged" durability; often referenced for automotive, outdoor and industrial (wide temp/humidity, vibration).
ISO 16750: specifically for road-vehicle electrical/electronic equipment — combined electrical + environmental stress.
RTCA DO-160: the benchmark for airborne equipment environmental conditions.

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Choosing the right severity

A standard doesn't decide "how hard to test" for you. A PCB in an engine bay and a consumer gadget indoors face completely different conditions. Derive the stress severity from the product's real use environment, expected lifetime and cost of failure — not by blindly stacking standards.

3.进阶: combined stress + HALT/HASS

In the real world stresses arrive together: vibration while hot, humidity while powered. Single-stress tests miss "coupling failures" (e.g. a connector that's fine at room temperature but fails under heat + vibration). That needs combined environment testing. A step further is HALT (Highly Accelerated Life Test) — push temperature and vibration far beyond spec to force design weaknesses out and improve the design — and HASS (Highly Accelerated Stress Screen) — apply moderate stress at production to screen early-life failures and cut field returns.

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Advice for exporters

① For outdoor / in-vehicle / industrial products, make environmental reliability part of pre-market validation — field-return cost far exceeds test cost. ② Use the self-check and tick "outdoor / in-vehicle / industrial" to get concrete temperature/vibration/salt-spray/IP guidance. ③ Keep the full test report — it's both quality evidence and protection against buyer audits and marketplace compliance checks.

Environmental reliability: put the product through the real world first