Here is a situation that happens more often than it should. An engineer receives a customer requirement. It says the product must meet "environmental standards." The engineer picks a standard — the one they've heard of — and writes a test plan around it. Six months later, the product reaches a customer who operates in Europe, or in a defense supply chain, and the standard chosen turns out to be the wrong one entirely.
Why standards exist
A test standard does one specific thing: it defines a reproducible method for applying a controlled stress to a product, so that the result means the same thing regardless of where, when, or by whom the test was run. Without a standard, "we tested it to 85°C" tells you almost nothing. A standard answers all of those questions in advance.
IEC 60068 — The international baseline
IEC 60068 is the closest thing the environmental testing world has to a universal reference. It was written specifically for electrical and electronic equipment and is recognised in most countries worldwide. The standard is structured as a family — IEC 60068-1 covers general principles, with individual test methods as numbered parts: IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-14 (thermal shock and cycling), IEC 60068-2-78 (damp heat steady state).
What IEC 60068 does not do is tell you which tests your product needs. It defines methods, not requirements. The product-specific standard references IEC 60068 test methods and specifies which ones apply, at what severity, for how long.
MIL-STD-810 — The defense benchmark
MIL-STD-810 was written to answer a specific question: will this equipment survive the environments US military forces actually operate in? It is organised around environments, not test methods: Method 500 (altitude), Method 501 (high temperature), Method 502 (low temperature), Method 507 (humidity), Method 514 (vibration), Method 516 (shock).
The key philosophical difference: MIL-STD-810 expects the test engineer to tailor the test to the actual deployment environment. It provides procedures and guidance, but explicitly states that test conditions should be derived from measured field data — not defaulted to table values.
ISO standards — The sector specialists
ISO is not a single standard — it's a publishing body for thousands of them. In environmental testing, the most relevant ISO standards are sector-specific. ISO 16750 is the dominant automotive standard for electrical and electronic equipment. ISO 4892 covers plastics testing under laboratory light sources. The pattern across ISO standards is consistent: they consume IEC 60068 test methods and add sector-specific acceptance criteria.
ASTM International — The materials specialists
ASTM standards dominate where materials meet environments. ASTM B117 is the most widely recognised salt spray standard in the world — in use since 1939. ASTM D4169 covers performance testing of shipping containers and systems. ASTM G154 covers UV weathering using fluorescent lamps.
The question that actually matters
Standards define methods. They don't define what your product needs to survive. That second question — what environments will this product actually encounter — is one that no standard answers for you. Engineers who understand this sequence produce test programmes that find real failures. Engineers who start with the standard and work backwards produce test programmes that produce paperwork.