Quick answer. A polyol/isocyanate SPF system entering the United States needs three files in the compliance folder before a container clears the port: an active TSCA Chemical Substance Inventory listing for every CAS number in the A-side and B-side plus a positive import certification at customs entry, a 16-section OSHA HazCom (GHS) Safety Data Sheet for each component with US-specific exposure limits and a 24-hour US emergency phone number, and — if the B-side carries unreacted diisocyanate and any of it reaches California — a DTSC Priority Product notification with interim hazard disclosure. Missing any one of these holds the shipment at the port, not the warehouse.
Buyers sourcing SPF polyol blends and MDI systems from overseas plants usually budget for freight, tariffs, and production lead time. What actually stalls a launch is paperwork nobody priced in — a TSCA certification the freight forwarder cannot generate, or an SDS built for the EU CLP format that a US distributor's safety officer sends straight back. We ship two-component A-side/B-side SPF systems to distributors across North America, and the checklist below is the same document stack our own export files pass through.
Four control points decide whether a shipment clears without a hold: EPA TSCA chemical inventory and import certification, OSHA's 16-section SDS requirement, California DTSC's Priority Product rule for unreacted diisocyanates, and the SPFA training documentation your installer customers will ask for before they buy.
TSCA: Matching CAS Numbers to the Active Inventory Before You Quote a Price
Under the Toxic Substances Control Act (15 U.S.C. § 2601 et seq.), the US-based importer — not the overseas factory — is treated as the "manufacturer" of record. Your company, not your supplier, carries the certification and Chemical Data Reporting (CDR) obligation once the container lands.
Every substance in the A-side blend (polyether or polyester polyol, amine or metal catalyst, silicone surfactant, flame retardant) and the B-side (MDI, CAS 101-68-8, or polymeric MDI, CAS 9016-87-9) has to sit on the active TSCA Chemical Substance Inventory. If one catalyst or flame retardant is missing, the fix is a Section 5 Premanufacture Notice with a 90-day EPA review, not a same-week problem.
At the border, TSCA Section 13 requires a positive certification statement filed with the customs entry, confirming every regulated substance in the shipment complies with TSCA. A broker who has not seen your CAS list in advance cannot generate this. Budget 1-2 weeks for documentation review even when every substance is already listed, and plan for a full CDR filing cycle once import volume crosses 25,000 lb/year of a non-exempt substance at one site.
SDS: Why a CLP-Format Sheet From Your Supplier Gets Rejected
OSHA's Hazard Communication Standard (29 CFR 1910.1200) requires a 16-section GHS-format SDS for each component, and it has to be the US version, not a European CLP sheet with the serial numbers swapped. The two most common rejection points: Section 1 without a 24-hour US-reachable emergency phone number, and Section 8 quoting only EU OELs instead of the OSHA PEL and ACGIH TLV a US industrial hygienist needs to sign off on PPE.
| SDS Section | Required Content | A-Side (Polyol Blend) Detail | B-Side (MDI / pMDI) Detail |
|---|---|---|---|
| 1. Identification | Product ID, US supplier, 24-hr emergency phone | Full blend trade name, not "Part A" | Isocyanate type and NCO index stated |
| 2. Hazard Identification | GHS classification, signal word, pictograms | Usually "Warning" — irritant, aquatic hazard from amine catalyst | Usually "Danger" — respiratory and skin sensitizer |
| 3. Composition | CAS numbers, concentration ranges | Polyol, catalyst, surfactant, flame retardant CAS list | CAS 101-68-8 or 9016-87-9, % monomeric MDI |
| 4. First-Aid Measures | Route-specific first aid | Eye/skin contact, ingestion | Inhalation protocol for sensitized workers |
| 5. Fire-Fighting | Extinguishing media, combustion products | Flash point of blend | HCN/NOx risk under fire conditions |
| 6. Accidental Release | Containment, spill cleanup | Absorbent, neutralization | Decontamination solution (sodium carbonate/detergent) |
| 7. Handling/Storage | Storage temp, incompatibilities | Moisture sensitivity of polyol blend | Moisture reactivity — CO2 gassing in sealed drums |
| 8. Exposure Controls/PPE | OSHA PEL, ACGIH TLV, PPE | Catalyst-specific exposure limits if applicable | OSHA PEL for MDI: 0.02 ppm ceiling, skin notation |
| 9. Physical/Chemical Properties | Viscosity, density, flash point | Viscosity at 25°C, OH number | NCO% by titration, viscosity at 25°C |
| 10. Stability/Reactivity | Reactive hazards | Shelf-life under moisture exposure | Exothermic reaction with water/amines |
| 11. Toxicological Information | Acute/chronic data | Skin/eye irritation data | Respiratory sensitization — core hazard class |
| 12. Ecological Information | Aquatic toxicity | Surfactant aquatic data | Hydrolysis products toxicity |
| 13. Disposal | Waste codes | State-specific disposal guidance | RCRA characteristic waste review |
| 14. Transport | UN number, packing group | Non-regulated for most blends | UN number if vapor pressure/classification triggers it |
| 15. Regulatory Information | TSCA, DTSC, state right-to-know | TSCA Inventory status per CAS | TSCA status plus DTSC Priority Product flag |
| 16. Other Information | Revision date, disclaimer | SDS revision date | SDS revision date |
California DTSC: The Priority Product Rule for Unreacted Diisocyanates
California's Safer Consumer Products program (Cal. Code Regs., tit. 22, div. 4.5, ch. 55), run by the Department of Toxic Substances Control, lists spray polyurethane foam systems containing unreacted diisocyanate as a Priority Product. This sits separate from, and is more specific than, a Prop 65 warning — importers who only check Prop 65 miss it entirely.
Because nearly all commercial and residential two-component SPF kits sold today are MDI-based rather than TDI-based, this listing captures the mainstream product, not a niche formulation. The "responsible entity" — typically the US importer of record, not the overseas plant — carries the notification duty to DTSC and the interim obligation to disclose unreacted diisocyanate content and the sensitization hazard on the label, under the standard SCP notification timeline.
The underlying health concern is respiratory sensitization from unreacted diisocyanate monomer, the mechanism NIOSH documents for isocyanate exposure generally. A supplier who cannot state the residual monomer content of the B-side in percent by weight cannot support this disclosure — ask for that figure directly in the Certificate of Analysis rather than reading it off the SDS.
SPFA Documentation and the Full Import Checklist
The Spray Polyurethane Foam Alliance runs a three-level Professional Certification Program (PCP) for installers: Level 1 covers safety fundamentals and PPE, Level 2 covers equipment and quality control, Level 3 is master-level. It is an industry credential, not a federal mandate, but a growing number of general contractors and insurers require Level 1 certification as a condition of the installer's bond.
A material supplier's job sits upstream of that exam: a technical data sheet with cream time, rise time, and tack-free time at a stated substrate temperature, a re-entry time backed by off-gassing data, and PPE requirements matched to the exposure figures in SDS Section 8. A TDS with one "typical" number and no test temperature gets flagged in a code-compliance review.
| Requirement | Governing Body | Applies To | Action Before First Shipment | Typical Lead Time |
|---|---|---|---|---|
| TSCA Inventory match + positive certification | EPA, TSCA §5 & §13 | A-side and B-side, every CAS number | Confirm inventory status; file certification with customs broker | 1-2 weeks if listed; 90+ days if a PMN is required |
| 16-section GHS SDS, US format | OSHA, 29 CFR 1910.1200 | Both components, shipped separately | Rebuild SDS in US format with PEL/TLV and US emergency phone | 2-4 weeks |
| DTSC Priority Product notification | CA DTSC, Safer Consumer Products | B-side systems with unreacted diisocyanate, sold in CA | File notification; add interim label disclosure | Within the standard SCP notification window |
| TSCA Chemical Data Reporting | EPA, TSCA §8(a) | Sites importing 25,000+ lb/yr of a non-exempt substance | File in the applicable CDR reporting cycle | Cyclical — confirm the current window |
| SPFA-ready technical documentation | SPFA (industry standard, not law) | End-use contractor training reference | Provide TDS with cure/re-entry data at stated test conditions | Documentation only |
What to Ask an Overseas Polyol Manufacturer Before You Sign the PO
A supplier who quotes a price without asking which US state the drums are landing in has not thought about DTSC. A supplier who sends the same SDS for every export market has not thought about Section 8 exposure limits. Both gaps become your problem at customs, not theirs.
Our A-side and B-side systems run through this exact documentation stack because our own drums ship into California and other SCP-adjacent states. Buyers working from our combination polyol systems catalog get CAS-matched SDS pairs and batch-level Certificates of Analysis with residual monomer content stated in percent, not a range copied from a generic data sheet. Formulation adjustments — index, catalyst package, flame retardant loading — happen in-house, not through a third-party blender who cannot answer a CAS question on a call.
FAQ
Q: Does every container need a fresh TSCA certification, or just the first one?
The positive certification is filed at each customs entry, but inventory status only needs re-verification when the formulation changes — a new catalyst or flame retardant CAS number, not a routine reorder of the same system.
Q: Is the DTSC Priority Product rule a national requirement?
No, it is California-specific. Most importers standardize the disclosure across every state rather than run two label versions, since the underlying hazard data does not change at a state line.
Q: Who is legally the "manufacturer" for TSCA purposes if we import from China?
The US importer of record. TSCA's definition of manufacture includes import, so EPA holds the US company accountable for certification and CDR filings even though formulation happens overseas.
Q: Do SPFA certifications apply to the raw material supplier or only the installer?
Only the installer/applicator sits the PCP exam. Suppliers support it indirectly by providing test-condition-specific TDS data the installer needs for coursework and code-compliance documentation.
Q: What's the most common SDS mistake that delays a shipment?
A Section 1 emergency phone number that only operates during Chinese business hours, or a Section 8 that lists only EU OELs. Both get sent back by a US distributor's EHS reviewer before the SDS is even filed with the shipment.
