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Resolução Gecex nº 829/2025 imposes a specific (per-unit) definitive anti-dumping duty of USD 47.46 per kilogram on imports of monomode optical fibres — single-mode fibres with core diameter below 11 micrometres classified under NCM 9001.10.11 — originating in China. The duty applies for a period of up to five years, subject to sunset review. It applies uniformly to all Chinese exporters (i.e., there is no individual company-specific rate schedule, unlike some GECEX AD resolutions that differentiate named producers).
The investigation was opened by SECEX on 2 August 2024 following a petition from Prysmian and Lightera (Furukawa Electric's Brazilian subsidiary), which together constitute the entire domestic production base for monomode optical fibre in Brazil. A public-interest evaluation (avaliação de interesse público) was conducted concurrently, as required by Decreto 8.058/2013 (Brazil's anti-dumping framework decree). Unlike the companion Resolução Gecex nº 837/2025 (which applied a below-DECOM-recommendation rate on optical-fibre cables on public-interest grounds), the raw-fibre duty was set at the full DECOM-recommended rate — reflecting a MDIC judgment that domestic production capacity is sufficient to substitute Chinese fibre, making the full duty appropriate.
The original 10-month investigation deadline (June 2025) was extended by 8 months to allow DECOM to complete the injury analysis, with the final determination signed in December 2025 and published in the DOU on 22 December 2025.
China supplied over 70% of Brazilian single-mode optical-fibre imports during the period of investigation. Brazil's fibre-optic cable infrastructure expansion — driven by ANATEL's broadband universalization goals and private ISP (WISP/FTTH) buildout in secondary cities — had relied heavily on price-competitive Chinese fibre strand. The USD 47.46/kg specific duty is steep relative to market pricing: at typical monomode fibre import prices in the USD 3-8/kg range during the POI, the ad-valorem equivalent of the specific duty would exceed 100% on the lower end of that range, effectively constituting a prohibitive tariff for some Chinese product grades.
Industry associations representing downstream telecoms operators and ISPs (Telcomp, Abramulti, Feninfra, Abrint) filed public-interest opposition during the investigation and publicly criticised the resolution upon publication, estimating downstream broadband infrastructure cost increases of approximately 170%. Abrint formally requested reconsideration in January 2026, arguing the measure would slow broadband expansion in underserved municipalities.
This is Brazil's fourth 2025-vintage AD resolution targeting Chinese goods, following:
The pattern reflects Brazil's SECEX-DECOM pipeline absorbing a surge of post-2022 petition filings across sectors affected by Chinese capacity glut exports, consistent with similar trade-remedy build-outs in the EU, India, and other EM markets during 2024-26.
China; operators with existing warehouse stock or forward contracts are shielded short-term.
likely expand Brazilian production capacity in response.
Hengtong) effectively lose access to the Brazilian market at competitive prices for up to five years.
rate) creates an asymmetric cost structure: the raw-strand duty is prohibitive while the cable duty is moderate, which may incentivise Brazilian cable assembly using non-Chinese imported strand or domestic strand.
review and possible duty modulation (as occurred with Gecex 857/2026 on electrical steel)?
South Korea, or US suppliers (Corning), or primarily toward domestic Prysmian/Furukawa capacity?