Calcium Hypochlorite Is Class 5.1 — Misdeclare It and Your Whole Container Bounces Back
Calcium Hypochlorite Is Class 5.1 — Misdeclare It and Your Whole Container Bounces Back
Executive Summary
Calcium hypochlorite looks like ordinary bleach powder, but it is a Class 5.1 oxidizing solid (UN 1748) under China's hazardous goods list. File it as general cargo and your full container gets returned at the terminal — at your cost. Here is how to clear it the first time.
| UN number: UN 1748 |
| Hazard class: Class 5.1 (oxidizing solid), Packing Group II |
| HS code: 2828 (calcium hypochlorite only) |
| Packing-certificate lead time: 7 days |
| Exam rate if HS code is wrong: up to 30% |
| Cost of a misdeclared box: ~RMB 50,000 |
Overview
Calcium hypochlorite — the stuff used for pool disinfection and bleaching — sits in China's hazardous goods list as UN 1748, a Class 5.1 oxidizing solid in Packing Group II. Don't let anyone file it as "just a disinfectant" and general cargo.
The final class comes from an authorized testing lab — that is the rule, not my opinion. Your specific lot needs its own test. But anything with high available chlorine that releases oxygen when heated is almost certainly dangerous goods.
The real trap: it looks exactly like ordinary bleaching powder. If your broker doesn't look closely and files it as non-hazardous, customs or the carrier will stop the box at the gate — and then you're hit with de-stuffing, re-filing and amendment fees, and the shipment is effectively dead. Worse, the sailing schedule hurts: South America East and Southeast Asia sail only once or twice a week, so once your container is pulled you wait at least two weeks for the next slot, and if your cargo was racing a delivery date, it is gone. Last year a calcium hypochlorite shipment to Southeast Asia was returned whole at Shekou simply because it lacked the Class 5.1 label; the shipper ate the amendment, return-freight and dead-freight costs himself — roughly RMB 100,000 all in.
Key Details
By sea, you must hold the Dangerous Goods Packaging Inspection Certificate for Export (what the trade calls the DG packing certificate). You need both the performance test report and the usage appraisal. See how we handle dangerous goods and compliance before the box is stuffed.
No certificate, no booking. Carriers simply won't take it. If you scramble to get one after the fact, even 7 days' lead time may not be enough, and your sailing slips a week or more.
Looking Ahead
Your 16-section MSDS is non-negotiable — customs and the carrier both check it. So are the Chinese-language safety label and the hazardous-properties classification report.
The box needs the Class 5.1 label and correct shipping marks, with UN 1748 printed clearly. Photograph it before stuffing — if you're ever inspected, that photo is your proof.
Get the HS code wrong and you're in trouble. HS code 2828 is the dedicated code for calcium hypochlorite; mess it up and you lose the export tax rebate and draw inspection controls — your exam rate can hit 30%.
Implications
Step one: get the test. Step two: get the packing certificate. Step three: book it as Class 5.1. Don't reverse the order.
Bottom line: don't gamble. Misfile as general cargo and you eat demurrage, amendment and return-freight costs — around RMB 50,000 a box, gone. That is not a saving you can bank. Why risk a five-figure hit just to skip one inspection fee?
Market Outlook
My read: enforcement on misdeclared oxidizers is only tightening. Customs and carriers now share data, and random container opening plus criminal liability is the new normal — the door on misdeclaration is basically shut. Frankly, if your calcium hypochlorite is on a sailing before mid-September, file it as Class 5.1 now; waiting until the booking desk pushes back costs you the whole slot. The catch is in your quote: build in the 7-day packing-certificate lead time and the 30% exam risk, or your margin disappears the moment one box is pulled. Chances are your buyer never sees this cost until the container is already stopped — so put it in the quote up front.
JETWAY Supply Chain is your execution partner on the ground in China — based in Tianjin, licensed as an NVOCC (MOT) and a member of CIFA, FIATA and WCA. We handle special cargo and compliance (dangerous goods, chemicals, batteries) across ocean, air, rail and road, and we pre-check your documents before the box is stuffed so your filing clears the first time. Send us your next booking and we will run the checks above against your sailing date. Request a quote.