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
Surface type (as described—in § 1505.6 (g)(2))	Thermal inertia type 1	°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). Code of Federal Regulations 595
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.

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