Polydimethylsiloxane (Low Molecular Weight) from Mexico
Low molecular weight polydimethylsiloxane (PDMS) oligomers with defined chain lengths are classified as organo-silicon compounds. Under HTS 2931.90.90.10 when chemically defined and not meeting polymer exclusions, distinguished from Chapter 39 silicones.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Provide molecular weight distribution and degree of polymerization data to prove chemical definition vs polymer status
• Reference Chapter 29 note (a) for impurities tolerance; >90% purity typically qualifies