View all text of Subpart A [§ 1505.1 - § 1505.8]
§ 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) |
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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.