16 CFR § 1505.7 - Maximum acceptable surface temperatures.

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§ 1505.7 Maximum acceptable surface temperatures.

The maximum acceptable surface temperatures for electrically operated toys shall be as follows:

Surface type (as described - in § 1505.6 (g)(2)) Thermal inertia type 1 Temperatures
°C. °F.
A 1 50 122
A 2 55 131
A 3 60 140
B 1 55 131
B 2 65 149
B 3 75 167
C (unmarked) 1 65 149
C (unmarked) 2 75 167
C (unmarked) 3 85 185
C (unmarked) 4 95 203
C marked 1 70 158
C marked 2 90 194
C marked 3 110 230
C marked 4 130 266
D (unmarked) 1 55 131
D (unmarked) 2 70 158
D (unmarked) 3 80 176
D (unmarked) 4 90 194
D marked 1 60 140
D marked 2 75 167
D marked 3 100 212
D marked 4 125 257
E ( 2) ( 3) ( 3)

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.