Polypropylene (PP) homopolymer and propylene copolymer grades enter the Brazilian market under the Mercosur Common Nomenclature NCM 3902.10.00 and NCM 3902.30.00, respectively. Importing PP into Brazil: RADAR License & INMETRO compliance requires separating resin-level customs obligations from article-level product certification obligations. A standard PP homopolymer injection moulding grade can show a density of 0.895–0.920 g/cm³ when measured according to ISO 1183-1, a melt flow rate of 0.3–100 g/10 min at 230 °C under a 2.16 kg load according to ISO 1133-1, and a tensile yield stress of 25–40 MPa according to ISO 527-2. These values are specification anchors for the Certificado de Análise; they are not product conformity certifications and do not by themselves trigger INMETRO intervention at the pellet stage.

Why Does the Import Process Require a RADAR Habilitação Before Cargo Arrival?

Under IN RFB 1.603/2015 as amended, the Receita Federal do Brasil requires every legal entity importing goods to be habilitated in the RADAR system before submitting a Declaração de Importação. The habilitação is not product-specific; a single RADAR registration covers PP resin import operations, but the selected modality imposes operational limits tied to import capacity and corporate financial documentation. The Expressa modality serves low-volume importers with a semiannual customs value limit of USD 50,000. The Limitada modality accommodates mid-size processors with a semiannual limit of USD 150,000. The Ilimitada modality removes the fixed limit and requires detailed equity and bank reference evidence. For a PP converter importing 250–800 t/year of homopolymer, the chosen modality influences whether one or two bulk shipments will reach the semiannual ceiling. Failure to maintain active RADAR status causes Siscomex to reject the DI registration, leaving the cargo in the customs zone and accruing demurrage.

Bulk PP homopolymer and impact copolymer pellets classified in Chapter 39 are not generally listed as mandatory INMETRO conformity assessment products at the resin stage. The certification obligation arises when the imported PP is a finished article—such as a toy, automotive replacement component, or electrical enclosure—covered by an active INMETRO technical regulation. The importer must screen the final article NCM against the INMETRO compulsory register before treating the shipment as low regulatory risk. A PP pellet consignment accompanied only by a certificate of analysis does not satisfy article-level INMETRO requirements if the NCM belongs to a regulated finished product. Raw resin conformity is therefore a matter of grade specification and customs classification, while INMETRO conformity assessment attaches to the fabricated item after conversion or when imported as finished goods.

When INMETRO Obligations Shift from Bulk Resin to Fabricated PP Components

Article-level certification becomes mandatory only when an INMETRO regulation lists the specific product code or product family. Polypropylene feedstock imported for in-house injection moulding of non-regulated industrial components remains outside INMETRO certification, but the moulded articles may enter a mandatory scheme if they are supplied to regulated sectors such as children’s products or the automotive aftermarket. The conformity process typically requires type testing under ABNT NBR or ISO test methods referenced by the applicable portaria, initial factory audit, annual surveillance audits, and product registration in the INMETRO database. Without that registration, Brazilian Customs may require additional technical justification or withhold release for regulated finished goods. The border control authority identifies regulated articles through NCM and product description in the import declaration; a mismatch between the shipped PP component and the declared raw-material NCM can result in penalties under customs rules, even if the buyer holds a valid RADAR habilitação.

The technical review of a PP import file should align the certificate of analysis with the designated grade under ISO 1873-1 or ASTM D4101. These designation systems express the material by processing method, polymer type, melt flow rate, and mechanical property ranges. Table 1 summarises representative commercial ranges for homopolymer and impact copolymer grades under common ISO methods; declared specification values for a single lot may fall outside these broad ranges without being non-conforming if the commercial specification sheet controls narrower limits.

Random copolymer grades contain ethylene in the propylene chain, shifting density and flexural modulus downward. A random copolymer may exhibit a flexural modulus of 700–1200 MPa under ISO 178 and a Vicat softening temperature of 120–135 °C under ISO 306, compared with 145–155 °C for a homopolymer. These differences are relevant when the declared NCM code is challenged; a random copolymer should be classified as a propylene copolymer where the comonomer content exceeds the applicable tariff threshold, not as a homopolymer under NCM 3902.10.00.

Siscomex Data Integrity and Batch-to-Batch Release Documentation

The import declaration submitted through Siscomex must contain harmonised product descriptions that match the commercial invoice, packing list, and Certificado de Análise. For PP resin, the product description should include the ISO 1873-1 designation block, grade name, NCM code, and net mass. Table 2 shows the documentation set that supports technical clearance without replacing the RADAR habilitação.

Batch-to-batch variance in PP melt flow rate can affect customs release when a certificate reports a value that no longer matches the declared grade. A homopolymer grade specified as MFR 12 g/10 min may show production variation of ±15% around the nominal value because of reactor operating differences and controlled rheology adjustments. The importer should not describe a lot as a different grade merely because a single MFR result is 10.5 g/10 min; the grade designation system typically allows a tighter internal specification than the broad ISO 1873-1 classification range.

Melt Flow Rate Drift Remains a Customs Valuation Risk

Customs valuation challenges arise when the declared unit price conflicts with the technical grade data on the invoice. A high-flow isotactic PP homopolymer with MFR 100 g/10 min at 230 °C under 2.16 kg is generally produced via controlled rheology or peroxide vis-breaking and can carry a different price structure from a low-MFR extrusion grade. When the Certificado de Análise reports an MFR outside the manufacturer’s published grade range, Receita Federal may request an expert technical review to verify the declared NCM and the commercial value. A low-MFR grade used for pipe extrusion may show MFR 0.3–0.5 g/10 min and a broad molecular weight distribution, while a thin-wall injection moulding grade may show MFR 35–70 g/10 min. The distinction is relevant under customs because a deliberate misdescription of high-flow PP as general-purpose homopolymer can affect the unit price declaration. Filled or reinforced PP compounds may require classification confirmation because inorganic filler content influences the tariff reading; the declarant should seek a Siscomex tariff ruling where filler content is significant.

A bulk PP shipment in 25 kg bags, super-sacks, or bulk hopper railcars presents specific contamination boundaries at discharge. Polypropylene is not hygroscopic, but surface condensation can occur when cold resin is transferred into a warm, humid warehouse. When relative humidity exceeds 60%, dry-air purging of silos and sufficient equilibration time should be considered to avoid surface moisture. Containerized PP arriving at a Brazilian dry port may be discharged into silos via vacuum conveying. The receiving system should maintain a conveying air dew point below -30 °C to prevent condensation, and the resin temperature should be allowed to equilibrate before injection moulding. On a production line with a 1,500 kN clamp force injection moulding machine, a flow-length/wall-thickness ratio above 200:1 may require a high-flow grade; replacement of that grade with a lower-MFR homopolymer can cause short shots and rejected parts. These process constraints are distinct from import licensing constraints, but they interact because a grade selected solely on customs cost may not satisfy the mechanical property requirements of the final article.