Caustic soda flakes for Vietnam, supplied plant-direct
Vietnamese buyers know this material as xút vảy (also written xút lá), natri hydroxit, or simply NaOH. Buying it was never the hard part. Importing it changed on 1 January 2026, when Vietnam’s new Law on Chemicals took effect and rewrote the declaration rules for chemical imports. This page covers the parts that actually cost money at the port: what your declaration now requires, which documents have to be Vietnamese-language and GHS-conformant, how a Form E certificate changes the duty you pay, and how to keep your consignee details consistent from our plant to your warehouse.
What Vietnamese importers normally specify
Most enquiries we receive from Vietnam are for flake caustic soda in 25 kg bags, for textile dyeing, water treatment, detergents and general industrial use — often palletised for a distribution warehouse. We produce 99% min as the plant’s grade, so it is the same plant, the same packing options and the same document set every time.
Typical values are from a production sample tested in March 2026 by an independent CMA- and CNAS-accredited laboratory under report TQT03-1051-2026; every item passed GB/T 209-2018.
| Parameter | Typical value | GB/T 209-2018 limit |
|---|---|---|
| NaOH content | 99.1% | ≥ 99.0% |
| Sodium carbonate (Na₂CO₃) | 0.3% | ≤ 0.8% |
| Sodium chloride (NaCl) | 0.01% | ≤ 0.05% |
| Iron oxide (Fe₂O₃) | 0.0006% | ≤ 0.008% |
| Appearance | White, lustrous flakes | Pass |
If your receiving laboratory tests more than assay, say so on the enquiry. Carbonate matters to soap makers, iron to textile and white-product buyers, chloride to corrosion-sensitive plants — we would rather answer the specification you actually test against than quote NaOH alone. The full sheet is on the caustic soda flakes product page.
What changed on 1 January 2026
Vietnam replaced its 2007 chemicals law with a new Law on Chemicals that came into force on 1 January 2026, with a supporting package of decrees and circulars following from mid-January 2026. It is the largest reform of Vietnamese chemical regulation in nearly two decades, and it changes what happens at the border for ordinary commodity imports like caustic soda. The headline points, drawn from published government and regulatory-advisory summaries:
- The old “declared chemicals” list is gone — declaration is now the rule, not the exception. Chemicals imported under HS Chapters 28 and 29, which is where caustic soda sits at 2815.11, must be declared through Vietnam’s National Single Window before customs clearance, whether or not the substance appears on any control list. The old practice of checking a list to see whether you had to declare is no longer how it works.
- New lists decide what licences apply. The new regime separates chemicals into basic, conditional, and special-control categories, plus a list of substances that require an incident-prevention and response plan. Whether an entry triggers an eligibility certificate, a per-shipment import permit, or a safety plan now depends on which appendix the substance appears in — a mapping exercise your broker does against the current appendices.
- Hazard communication moves to UN-GHS. Classification, labelling and safety data sheets are aligned to UN-GHS (Revision 2 and later building blocks), and Vietnamese-language SDS and labels are expected for hazardous material.
- Storage gets its own certificate. From 1 July 2026, facilities storing hazardous chemicals must hold a certificate of eligibility — or use a licensed chemical storage service — which affects the warehouse your container is cleared to.
- New-chemical registration, with a long clock. Substances not on Vietnam’s national inventory and not recognised from major foreign inventories are treated as new chemicals and need prior registration plus a third-party risk assessment, with a review period of up to 90 working days. Caustic soda is a long-established commodity rather than a new substance, so this is not a barrier for our product — but it is why your broker may ask for chemical identity and CAS number (1310-73-2) up front.
- Transitional relief exists. Licences issued under the old law run to their original expiry, and certificates for conditional chemicals remain valid until 31 December 2027. Confidential business information can be filed through an authorised representative, so composition detail does not have to be published.
These are summaries of published regulatory guidance, not legal advice. The appendices and the enforcement practice for your specific entry are for your customs broker and the Vietnamese authorities to confirm. What we can do is get you the chemical identity and the export documents early enough that your declaration is prepared before the vessel berths rather than at the port.
The clearance checklist: your side and ours
Almost nothing that goes wrong clearing caustic soda in Vietnam is about the goods. It is about paperwork being in the right form, in the right language, on the right entity, before the container lands. This is the split we work to.
Your side, as importer of record
- An importing entity and tax code that match the consignee. The name and tax details on the bill of lading must line up with the entity that files the declaration. A mismatch between the party named on the B/L and the party licensed to import is the single most common cause of a hold.
- The chemical import declaration, filed before clearance. Under the 2026 law this is required for Chapter 28 imports through the National Single Window. This is your broker’s filing, not ours, but it is built on data we supply — so the earlier you send us the consignee details, the earlier it can be prepared.
- A licensed customs broker and a letter of authorisation if the broker files on your behalf.
- Documents in Vietnamese. For hazardous chemicals a Vietnamese-language SDS and GHS-conforming warning labels are expected. We issue the English MSDS as standard and can supply the Vietnamese version with the shipping documents.
- Handling and storage that meet Vietnamese requirements at your end. Caustic soda is a corrosive hazardous chemical, which brings storage and inland-transport rules — and, from 1 July 2026, the storage certificate requirement described above. Ask your broker whether your site needs a qualifying warehouse or a licensed storage service.
Our side, as exporter
- Commercial invoice and packing list built on exactly the same data as the bill of lading: HS 2815.11, net and gross weight, package count, marks and seal number.
- Bill of lading consigned precisely as you instruct, with the consignee name and tax details you give us — not a default name from our side.
- Form E certificate of origin under the ASEAN–China Free Trade Area, so your broker can claim preferential duty treatment where the rules of origin are met. The rate that applies to your entry is confirmed by your broker against the classification you declare — the classification and duty mechanics are explained in HS 2815.11, customs and duty.
- Batch certificate of analysis for the actual shipment, plus the MSDS, both issued before the vessel sails.
- Dangerous-goods documentation for the export leg: UN 1823, Class 8, with compliant packaging and the packing certificate the shipping line requires.
- Seal number and loading photographs taken at the plant and sent with the documents, so your broker and your receiving team both know what is in the container before it opens.
Where a Vietnamese import usually goes wrong
- A consignee mismatch. The container arrives consigned to one company while the declaring entity and tax code belong to another. That has to be settled before the bill of lading is issued, not after the ship sails.
- Working to the old declaration rules. The most expensive mistake in 2026 is assuming the previous system still applies. The declared-chemicals list is gone; Chapter 28 imports are declared, and a shipment that reaches the port with its declaration unprepared loses days.
- Labels and SDS in English only. Vietnamese-language versions are expected for hazardous material, and their absence is exactly the kind of detail that moves a container into a slower inspection channel.
- Wooden pallets without the ISPM 15 mark. Wood packaging should carry the IPPC mark. We can load on plastic pallets, or on wood with the required treatment and marking.
- Documents that arrive after the vessel. Send your broker the invoice, packing list, Form E and MSDS while the container is still at sea, so the declaration can be prepared in advance.
- Leaving clearance late. Vietnamese rules set a deadline for clearing goods after arrival, and cargo left uncleared accrues storage and can ultimately be treated as unclaimed. Confirm the deadline that applies to your entry with your broker and diarise it.
We cannot clear your goods for you. What we can do is make sure nothing on our side of the fence is missing, pre-alert the documents, and tell you honestly when a requirement cannot be met — rather than let you discover it at the port. Our document set is listed under documents and downloads.
Duty: what a Form E actually does
Caustic soda enters Vietnam under HS 2815.11 (solid sodium hydroxide). Two things determine the duty on your entry: the classification you declare, and the origin you can prove. Both are set out in more detail in our guide to HS 2815.11, customs and duty.
- Form E is the origin proof. As a Chinese producer we issue the ACFTA Form E certificate of origin, which lets your broker claim the ASEAN–China preferential rate instead of the standard MFN rate. Published tariff compilations put both in the low single digits, with the ACFTA rate lower again — but schedules are revised and rates depend on your declared classification, so have your broker confirm the rate that applies to your entry rather than relying on a figure from a supplier.
- Duty is only one line of landed cost. Import VAT, port and terminal charges, inland haulage and dangerous-goods handling all sit alongside it. Our guide to what drives the price of caustic soda flakes explains why the same FOB number can land at very different totals.
- The comparison that matters is delivered cost per tonne of 100% NaOH, which lets you hold a flake offer and a liquid offer side by side. Our flakes versus pearls versus liquid guide sets out the arithmetic.
Ports, packing and shipping
We load at Tianjin (Xingang), the export port for our region, and quote FOB Tianjin as standard, with CFR and CIF to your destination port on request. The Vietnamese gateways our buyers name most often are Hai Phong in the north, Cai Mep–Thi Vai and Cat Lai (Ho Chi Minh City) in the south, and Da Nang and Cai Lan for central and northern industrial zones; we quote to other ports on request.
| Packing | Container | Typical net weight |
|---|---|---|
| 25 kg PP/PE bags, loose loaded | 20' FCL | 25 MT (1,000 bags) |
| 25 kg PP/PE bags on pallets | 20' FCL | 22 MT |
| 1 MT jumbo bags | 20' FCL | 20 MT (20 bags) |
| 25 kg PP/PE bags | 40' FCL | 27 MT (weight-limited) |
Two practical notes. First, caustic soda is a dangerous good, so bookings are normally placed ten to fourteen days before the scheduled sailing — the earlier an order is confirmed, the more sailings you have to choose from. Second, a 40-foot container reaches its weight limit before it runs out of space, so a heavier load usually means a second 20-foot rather than a bigger box. Loading and packing detail is on the packing and loading page, and storage guidance is in the handling guide.
Why Vietnam keeps importing
Vietnam has real domestic chlor-alkali production, and it still cannot cover its own consumption. That is structural, and it is the reason flake imports have a durable place in the market rather than filling a seasonal gap.
- Imports carry the balance. Published market-research estimates put imported caustic soda at roughly 55–70% of Vietnam’s national requirement, with solid caustic entering by bag and container for the many mid-sized and dispersed buyers, and liquid arriving in ISO-tanks for large continuous plants.
- Domestic supply is tied to chlorine, not to caustic demand. Vietnamese chlor-alkali plants make caustic soda as a co-product of chlorine, so their operating rate follows chlorine offtake from PVC, water-treatment and other chlorine-consuming industries. When chlorine demand weakens, producers can cut rates even while caustic demand stays firm — which is why domestic supply is not something a buyer can rely on as a sole source.
- Cost exposure sits with the producer. Electricity and salt are estimated at 55–70% of cash production cost in published industry estimates, so domestic producers are the ones exposed to power-tariff swings — an exposure an importer buying on a fixed offer does not carry.
- Supply is geographically concentrated, and capacity is being added. Output clusters near a small number of industrial zones, and Vietnam’s Ministry of Industry and Trade has set out plans for major chemical clusters at Hai Phong, Nghi Son and Ba Ria–Vung Tau. Reported additions include a caustic soda plant project by a domestic chemical group in 2025, an electrolysis capacity increase at another producer from 40,000 to 50,000 tonnes a year, and the August 2025 restart of the Long Son petrochemical complex, which lifts downstream caustic demand. Plants of that scale take years to reach full output, so imports remain the marginal supply in the meantime.
- The demand base is broad. Published estimates put Vietnam’s caustic soda market in the region of 330–340 thousand tonnes in 2025, growing at a low single-digit rate, pulled by textiles and dyeing, pulp and paper, water treatment, alumina and metals, detergents, and the wider industrial build-out.
The figures above are published industry estimates from market-research and trade-data sources, not our own measurements. Treat them as a direction of travel and verify the current data for your own planning — we would rather point you at the shape of the market than hand you a number that has gone stale.
Related reading: what drives the price of caustic soda flakes · how to check a Chinese supplier before you pay · supply into Indonesia.
Questions Vietnamese buyers ask us
What do we have to declare to import caustic soda into Vietnam in 2026?
Under Vietnam's Law on Chemicals in force since 1 January 2026, the old list of declared chemicals has been abolished and imports under HS Chapters 28 and 29 — which includes caustic soda at 2815.11 — must be declared through the National Single Window before customs clearance, regardless of whether the substance is on a control list. Your customs broker files the declaration; we supply the chemical identity (CAS 1310-73-2), the export documents and the SDS data it is built on. Confirm the appendices and any additional control that applies to your entry with your broker.
Do you provide the SDS and labels in Vietnamese?
We issue the English MSDS as standard and can supply a Vietnamese-language version together with the shipping documents, along with GHS-conforming labels in Vietnamese for hazardous material, to align with the UN-GHS requirements under the 2026 law. Tell us at enquiry stage so it is built into the order rather than added once the container is already at the port.
Can you issue a Form E certificate of origin for Vietnam?
Yes. We issue Form E under the ASEAN-China Free Trade Area so that your broker can apply for preferential duty treatment where the rules of origin are met. China is the origin of the material and we state that in writing on the offer. The rate that applies to your entry is confirmed by your broker against the classification you declare, in your market, at the time of import.
Which Vietnamese ports do you ship to?
FOB Tianjin (Xingang) as standard, with CFR and CIF quoted to Hai Phong, Cai Mep-Thi Vai, Cat Lai (Ho Chi Minh City), Da Nang, Cai Lan and other ports on request. We load 20-foot and 40-foot containers; heavy loads are usually better as 20-foot because a 40-foot box hits its weight limit first.
What is your minimum order for Vietnam?
Our standard supply unit is one 20-foot container, about 25 MT of 25 kg bags or 22 MT palletised. If you would rather test the material before committing to a container, say so on the enquiry and we will discuss what a trial quantity looks like for your port.
Does the new chemicals law affect the goods, or only the paperwork?
Caustic soda is a long-established commodity, not a new chemical, so the law does not turn it into a restricted substance. What it changes is procedure: mandatory declaration before clearance, UN-GHS labelling and safety data sheets, Vietnamese-language documents where required, and storage certification at the receiving end. Those obligations are per-transaction and strict, which is why the documentation is best prepared while the container is still at sea.
What grade do you supply for the Vietnamese market?
99% min, from our own plant, on the same documents every shipment. It suits textile and dyeing work, water treatment, detergents and general industrial use as well as buyers working to a tighter specification or a formulation limit. The specification page sets out the impurity limits.
Why flakes rather than liquid caustic soda for Vietnam?
Flakes store at ambient temperature in sealed bags, need no heated tanks, and suit mid-scale manufacturers and distributors who cannot take a road tanker. Liquid 50% suits large continuous plants with a tank farm, and you pay freight on the water it contains. The comparison is set out in our flakes versus pearls versus liquid guide.
Request a quotation
Send us your required grade, quantity and destination port. We reply with an indicative price, packing options and a specification sheet — normally within one working day.