Below what temperature is life threatening during heat testing?

• A. 60 degrees
• B. 64 degrees
• C. 68 degrees
• D. 72 degrees

Answer: (B)

In heat testing, the key safety boundary is the temperature at which brief skin contact can cause severe, potentially life-threatening burns. The standard defines 64 degrees as that threshold. That means when a surface is at or above 64°C, the risk is life-threatening with very short exposure. Temperatures below this are not considered the life-threatening boundary, though they can still cause harm with enough contact time. The other numbers aren’t the defined burn-threshold in this testing context, so 64 degrees is the correct boundary to identify life-threatening risk.