HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Calcium hypochlorite, hydrated, corrosive or Calcium hypochlorite, hydrated mixture, corrosive with not less than 5.5% but not more than 16% water
HMT 15 June 2026Calcium hypochlorite, hydrated, corrosive or Calcium hypochlorite, hydrated mixture, corrosive with not less than 5.5% but not more than 16% water
Calcium hypochlorite is an inorganic compound with chemical formula Ca(ClO)2, also written as Ca(OCl)2. It is a white solid, although commercial samples appear yellow. It strongly smells of chlorine, owing to its slow decomposition in moist air. This compound is relatively stable as a solid and solution and has greater available chlorine than sodium hypochlorite Wikipedia
Substance Data
Source: PubChem (HSDB, 13.12.2019)CAS-Number7778-54-3 |
Flash Point— | Boiling Point— |
| Emergency Response Guide No. 140 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class5.1Oxidizers |
(4) Identification number |
(5) Packing Group |
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(6) Labels |
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(7) Special Provisions (§172.102)
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| 165 | |
|---|---|
| IB8 | |
| IP2 | |
| IP4 | |
| IP13 | |
| W9 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 152 | see 49 CFR §173.152 |
|---|---|---|
| (8B) Non-bulk | 212 | see 49 CFR §173.212 |
| (8C) Bulk | 240 | see 49 CFR §173.240 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 5 kg |
|---|---|
| (9B) Cargo aircraft only | 25 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard class5.1Oxidizers |
(4) Identification number |
(5) Packing Group |
|||||||||
(6) Labels |
|||||||||||
(7) Special Provisions (§172.102)
|
|||||||||||
| 165 | |
|---|---|
| IB8 | |
| IP4 | |
| W9 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 152 | see 49 CFR §173.152 |
|---|---|---|
| (8B) Non-bulk | 213 | see 49 CFR §173.213 |
| (8C) Bulk | 240 | see 49 CFR §173.240 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 25 kg |
|---|---|
| (9B) Cargo aircraft only | 100 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
Packing group comparison
Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.
| PG II | PG III | |
|---|---|---|
| 1 | ||
| 2 | Calcium hypochlorite, hydrated, corrosive or Calcium hypochlorite, hydrated mixture, corrosive with not less than 5.5% but not more than 16% water | Calcium hypochlorite, hydrated, corrosive or Calcium hypochlorite, hydrated mixture, corrosive with not less than 5.5% but not more than 16% water |
| 3 | 5.1 | 5.1 |
| 4 | UN 3487 | UN 3487 |
| 5 | II | III |
| 6 | 5.1, 8 | 5.1, 8 |
| 7 | 165, IB8, IP2, IP4, IP13, W9 | 165, IB8, IP4, W9 |
| 8A | 152 | 152 |
| 8B | 212 | 213 |
| 8C | 240 | 240 |
| 9A | 5 kg | 25 kg |
| 9B | 25 kg | 100 kg |
| 10A | D | D |
| 10B | 4, 25, 52, 56, 58, 69, 142 | 4, 25, 52, 56, 58, 69, 142 |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |