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The maximum acceptable surface temperatures for electrically operated toys shall be as follows:
1 Thermal inertia types are defined in terms of lambda as follows:
Type 1: Greater than 0.0045 (e.g., most metals).
Type 2: More than 0.0005 but not more than 0.0045 (e.g., glass).
Type 3: More than 0.0001 but not more than 0.0005 (e.g., most plastics).
Type 4: 0.0001 or less (e.g., future polymeric materials).
The thermal inertia of a material can be obtained by multiplying the thermal conductivity (cal./cm./sec./degrees C.) by the density (gm./cm. 3) by the specific heat (cal./gm./degrees C.).
2 All types.
3 No limit.