Table 507.6: -I. High humidity diurnal categories · MIL-STD-810H

	Natural¹									Induced (Storage and Transit)
	High Humidity						Hot Humid (Cycle B3)			Constant Temp. (Cycle B1)			Cyclic High RH (Cycle B2)			Hot Humid (Cycle B3)
	Constant Temp. (Cycle B1)			Cyclic High RH (Cycle B2)			Hot Humid (Cycle B3)			Constant Temp. (Cycle B1)			Cyclic High RH (Cycle B2)			Hot Humid (Cycle B3)
	Temp		RH	Temp		RH	Temp		RH	Temp		RH	Temp		RH	Temp		RH
Time	°C	°F	%	°C	°F	%	°C	°F	%	°C	°F	%	°C	°F	%	°C	°F	%
0100	Nearly constant at 24°C (75°F) throughout the 24 hours			27	80	100²	31	88	88	Nearly constant at 27°C (80°F) throughout the 24 hours			33	91	69	35	95	67
0200				26	79	100	31	88	88				32	90	70	34	94	72
0300				26	79	100	31	88	88				32	90	71	34	94	75
0400				26	79	100	31	88	88				31	88	72	34	93	77
0500				26	78	100	31	88	88				30	86	74	33	92	79
0600				29	78	100	32	90	85				31	88	75	33	91	80
0700				27	81	94	34	93	80				34	93	64	36	97	70
0800				29	84	88	36	96	76				38	101	54	40	104	54
0900				31	87	82	37	98	73				42	107	43	44	111	42
1000				32	89	79	38	100	69				45	113	36	51	124	31
1100				33	92	77	39	102	65				51	124	29	57	135	24
1200				34	94	75	40	104	62				57	134	22	62	144	17
1300				34	94	74	41	105	59				61	142	21	66	151	16
1400				35	95	74	41	105	59				63	145	20	69	156	15
1500				35	95	74	41	105	59				63	145	19	71	160	14
1600				34	93	76	41	105	59				62	144	20	69	156	16
1700				33	92	79	39	102	65				60	140	21	66	151	18
1800				32	90	82	37	99	69				57	134	22	63	145	21
1900				31	88	86	36	97	73				50	122	32	58	136	29
2000				29	85	91	34	94	79				44	111	43	50	122	41
2100				28	83	95	33	91	85				38	101	54	41	105	53
2200				28	82	96	32	90	85				35	95	59	39	103	58
2300				27	81	100	32	89	88				34	93	63	37	99	62
2400				27	80	100	31	88	88				33	91	68	35	95	63

507.6 -II. Test cycles (days)

MATERIEL CATEGORY	NATURAL¹			INDUCED (STORAGE and TRANSIT)
MATERIEL CATEGORY	Cycle B1	Cycle B2	Cycle B3	Cycle B1	Cycle B2	Cycle B3
Hazardous Items Normal Test Duration	90	90	30	180	180	30
Non-Hazardous Items Normal Test Duration	45	45	15	90	90	15

¹ Perform operational checks at least once every five days; more frequent checks may provide early detection of potential problems.

c. Procedure II – Aggravated Cycle. For Procedure II, in addition to a 24-hour conditioning cycle (paragraph 4.4.2.2), the minimum number of 24-hour cycles for the test is ten. Although the combined 60 °C (140 °F) and 95 percent RH does not occur in nature, this combination of temperature and relative humidity, has historically proven adequate to reveal potential effects in most materiel. Extend the test as specified in the test plan to provide a higher degree of confidence in the materiel to withstand warm, humid conditions. For the test items incorporating seals to protect moisture-sensitive materials, e.g., pyrotechnics, longer test durations may be required.

	Natural¹	Induced (Storage and Transit)
0100	Nearly constant at 24°C (75°F) throughout the 24 hours	27	80	100²	31	88	88	Nearly constant at 27°C (80°F) throughout the 24 hours	33	91	69	35	95	67
0200	26	79	100	31	88	88	32	90	70	34	94	72
0300	26	79	100	31	88	88	32	90	71	34	94	75
0400	26	79	100	31	88	88	31	88	72	34	93	77
0500	26	78	100	31	88	88	30	86	74	33	92	79
0600	29	78	100	32	90	85	31	88	75	33	91	80
0700	27	81	94	34	93	80	34	93	64	36	97	70
0800	29	84	88	36	96	76	38	101	54	40	104	54
0900	31	87	82	37	98	73	42	107	43	44	111	42
1000	32	89	79	38	100	69	45	113	36	51	124	31
1100	33	92	77	39	102	65	51	124	29	57	135	24
1200	34	94	75	40	104	62	57	134	22	62	144	17
1300	34	94	74	41	105	59	61	142	21	66	151	16
1400	35	95	74	41	105	59	63	145	20	69	156	15
1500	35	95	74	41	105	59	63	145	19	71	160	14
1600	34	93	76	41	105	59	62	144	20	69	156	16
1700	33	92	79	39	102	65	60	140	21	66	151	18
1800	32	90	82	37	99	69	57	134	22	63	145	21
1900	31	88	86	36	97	73	50	122	32	58	136	29
2000	29	85	91	34	94	79	44	111	43	50	122	41
2100	28	83	95	33	91	85	38	101	54	41	105	53
2200	28	82	96	32	90	85	35	95	59	39	103	58
2300	27	81	100	32	89	88	34	93	63	37	99	62
2400	27	80	100	31	88	88	33	91	68	35	95	63

Natural¹

Induced (Storage and Transit)

High Humidity

Hot Humid
(Cycle B3)

Constant Temp.
(Cycle B1)

Cyclic High RH
(Cycle B2)

Hot Humid
(Cycle B3)

Constant Temp.
(Cycle B1)

Cyclic High RH
(Cycle B2)

Temp

Time

°C

°F

°C

°F

°C

°F

°C

°F

°C

°F

°C

°F

0100

Nearly constant at 24°C (75°F) throughout the 24 hours

100²

Nearly constant at 27°C (80°F) throughout the 24 hours

0200

100

0300

100

0400

100

0500

100

0600

100

0700

0800

101

104

0900

107

111

1000

100

113

124

1100

102

124

135

1200

104

134

144

1300

105

142

151

1400

105

145

156

1500

105

145

160

1600

105

144

156

1700

102

140

151

1800

134

145

1900

122

136

2000

111

122

2100

101

105

2200

103

2300

100

2400

100

507.6 -II. Test cycles (days)

MATERIEL CATEGORY	NATURAL¹			INDUCED (STORAGE and TRANSIT)
MATERIEL CATEGORY	Cycle B1	Cycle B2	Cycle B3	Cycle B1	Cycle B2	Cycle B3
Hazardous Items Normal Test Duration	90	90	30	180	180	30
Non-Hazardous Items Normal Test Duration	45	45	15	90	90	15

¹ Perform operational checks at least once every five days; more frequent checks may provide early detection of potential problems.

c. Procedure II – Aggravated Cycle. For Procedure II, in addition to a 24-hour conditioning cycle (paragraph 4.4.2.2), the minimum number of 24-hour cycles for the test is ten. Although the combined 60 °C (140 °F) and 95 percent RH does not occur in nature, this combination of temperature and relative humidity, has historically proven adequate to reveal potential effects in most materiel. Extend the test as specified in the test plan to provide a higher degree of confidence in the materiel to withstand warm, humid conditions. For the test items incorporating seals to protect moisture-sensitive materials, e.g., pyrotechnics, longer test durations may be required.