If you’re a US buyer close to placing a purchase order with a Vietnamese PVC compounder, two questions usually come up before anything else: what’s the correct HS code for the product you’re buying, and what will it actually cost to land at your dock once duties and paperwork are accounted for. This article answers both, plus the documentation checklist that keeps a first shipment from stalling at customs. For the broader strategic case for sourcing PVC compound from Vietnam, see our pillar article comparing Vietnam against other sourcing countries; for how Vietnam’s tariff position compares specifically to China’s, see our China+1 strategy piece — we won’t repeat that comparison here.
Vietnam’s PVC compound exports, in context
Vietnam’s plastics industry now spans more than 4,000 manufacturing enterprises, generating roughly $32 billion in industry-wide revenue and $6.5–6.6 billion in exports to over 170 markets, according to the Vietnam Plastics Association (VPA, via Nhựa Tân Phú). PVC compound sits within that broader plastics trade flow under a specific customs classification worth understanding before you sign a PO.
HS Code 3904: what it actually covers, and why the exact line matters
HS Heading 3904 covers “polymers of vinyl chloride or of other halogenated olefins, in primary forms” — but the 8-digit line your shipment falls under depends on the exact formulation, not the product’s trade name. The distinction that matters most for compound buyers:
- 3904.10 — PVC resin not mixed with any other substance: raw polymer, before any compounding.
- 3904.21 — Other PVC, non-plasticised: this is where rigid PVC compound (used for pipe, profile, window systems) typically falls.
- 3904.22 — Other PVC, plasticised: this is where flexible PVC compound (cable jacketing, flooring, gaskets) typically falls.
(see the classification breakdown at FreightAmigo’s HS code guide for polyvinyl chloride)
This maps directly onto the rigid-vs-flexible distinction we’ve covered before in our PVC compound FAQ — but don’t assume the marketing name settles the classification. Whether a specific formulation lands in 3904.21 vs 3904.22 depends on plasticizer content as verified against the actual spec sheet, and getting it wrong means paying (or under-paying, which creates its own liability) the wrong duty rate. Confirm the 8-digit line with your customs broker against your specific product’s technical data sheet before your first shipment, not after.
The tariff mechanism — and why we’re not printing a single fixed number
This is genuinely one of the fastest-moving parts of US trade policy right now, so treat any specific percentage you read anywhere — including here — as a snapshot, not a fact carved in stone. As of mid-2026, the tariff a Vietnamese PVC compound shipment faces is layered: a baseline MFN duty (averaging around 4.2% for Chapter 39 plastics from Vietnam, per TariffsTool.com), plus the reciprocal/Section 122 layer negotiated under the mid-2025 US-Vietnam framework, cited at a headline 20% by some trackers and differently by others depending on how they read the layered structure (compare Dimerco’s 2026 tariff update, USTariffRates.com, and TariffCentral.org). Unlike Chinese-origin plastics, Vietnamese PVC compound does not carry a Section 301 layer — that’s the structural gap we cover in more depth in our China+1 article.
The Section 122 mechanism itself is under legal challenge in US courts and is expected to sunset around July 24, 2026 absent new legislation, which means the applicable rate could look different by the time you’re reading this. Run your specific HS line through a current landed-cost calculator or your broker before quoting a customer, and re-check it close to your actual shipment date — not at the time you first researched the deal.
Documentation checklist for a first shipment
The paper trail matters as much as the classification. For a PVC compound shipment from Vietnam to the US, the core documents typically include:
- Commercial invoice and packing list — product description, HS code, quantities, and weights must match exactly across every document; even small wording mismatches (“PVC compound” vs “PVC resin compound”) can trigger a customs hold (Hansatic’s shipping documents checklist).
- Certificate of Origin (C/O) — as of May 2025, Vietnam moved C/O issuance authority from the Vietnam Chamber of Commerce and Industry (VCCI) to the Ministry of Industry and Trade (MoIT), with stricter substantial-transformation documentation requirements — a point we cover in more detail in our China+1 article given its connection to transshipment scrutiny.
- Safety Data Sheet (SDS/MSDS) — prepared in GHS format; for the export declaration on the Vietnam side, the chemical name, CAS number, and HS code must match exactly across the invoice, SDS, and any labeling (FedEx’s export clearance guidelines for Vietnam).
- Certificate of Analysis (COA) — a per-batch lab report confirming the compound meets the agreed technical specification; standard practice for chemical/compound shipments even where not strictly a customs requirement.
- Bill of Lading and ISF filing — for ocean freight, the US importer’s customs broker typically files the Importer Security Filing (ISF) at least 24 hours before the vessel loads at the Vietnamese port (Hansatic’s shipping documents checklist).
A licensed customs broker on both ends — reviewing documents before the shipment leaves Vietnam, not after it arrives in the US — is the difference between a smooth first shipment and a costly hold.
What to expect on lead time
We won’t quote you Tín Kim’s specific lead time here — that’s a conversation for your RFQ — but industry benchmarks are useful for planning purposes. Building-material and industrial goods manufactured in Vietnam commonly ship in 45–75 days from order confirmation to delivery (Cosmo Sourcing), with FCL ocean freight typically running 30–45 days door-to-door depending on the route (VinWorld) and LCL adding roughly 5–10 days on top of that for consolidation (TEU Global). One seasonal factor worth building into your planning calendar: most Vietnamese manufacturing shuts down for about two weeks around Tet (late January–February) (Dewin).
Getting started If you’re evaluating a Vietnamese PVC compounder for a US-bound order, the questions worth asking upfront are: can they confirm the exact 8-digit HS line for your specific formulation, do they have a track record of clean C/O documentation, and can they provide a COA with every batch. Tín Kim compounds both rigid and flexible PVC domestically at our facility in Dong An 2 Industrial Park, Binh Duong, and can walk you through classification and documentation for your specific product before you commit to an order.