16 CFR 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.