Polydimethylsiloxane (Low Molecular Weight) from China
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 — China → United States
41.2%
Rate breakdown
9903.88.0425%Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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