Calculation Criteria for HS 3907 Origin Rules: Applying the 50% Originating Polymer Weight Requirement Released

Regarding the proviso in the Rules of Origin for HS Heading 3907, specifically the clause stating "provided that the originating polymers of headings 3901 to 3915 comprise 50 percent or more of the total weight of the polymers," your understanding is correct. This regulation requires that among the Total Weight of All Polymers used to produce the final HS 3907 product, the weight of originating polymers classified under HS 3901 through 3915 must account for at least 50%.

This proviso acts as a special provision supplementing or replacing the standard Change of Tariff Heading (CTH) rule. It is designed to reflect the specific production characteristics of polymer products, where various types of polymers are often mixed or polymerized to form the final good. The objective is to grant originating status based on the substantial transformation of the polymers—the core components—rather than a simple change in tariff classification. Consequently, this rule encourages the use of regional polymers and emphasizes the creation of regional value added.

Definition of Key Terms

To apply this rule correctly, one must clearly define the weight components:

• Total Polymer Weight: This refers to the sum of the weights of all polymers constituting the HS 3907 product. It includes the main raw material polymers as well as any polymers added to impart specific properties (e.g., strength, flexibility, heat resistance). However, non-polymer additives such as plasticizers, stabilizers, pigments, fillers, and catalysts are excluded from this calculation. Only pure polymer components are summed.
• Originating Polymers of Headings 3901-3915: This refers to polymers used in the process that fall under HS Codes 3901 through 3915 AND have acquired originating status within the free trade area. Merely falling under these HS codes is insufficient; the polymers must satisfy their own specific Rules of Origin (e.g., CTH, Regional Value Content) and possess valid proof of origin.

Step-by-Step Calculation Method

The specific calculation method and criteria are as follows:

• Step 1: Determine Total Polymer Weight
  Identify all polymer materials used in the production of the HS 3907 product and sum their weights to calculate the 'Total Polymer Weight.'
• Step 2: Identify and Sum Originating Polymer Weight
  From the polymers identified in Step 1, filter for those classified under HS 3901-3915 that are confirmed as 'originating goods' of the party to the agreement. Sum these to calculate the 'Weight of Originating HS 3901-3915 Polymers.' Origin status must be supported by valid documentation (e.g., Certificate of Origin, Supplier's Declaration of Origin).
• Step 3: Calculate Ratio and Verify
  Divide the result of Step 2 by the result of Step 1 and convert to a percentage.
  Formula: (Weight of Originating HS 3901-3915 Polymers / Total Polymer Weight) × 100% ≥ 50%
  If the result is 50% or higher, the HS 3907 product satisfies the origin criteria and qualifies as an originating good.

Documentation and Compliance

Applying this criterion requires strict raw material management and documentation throughout the production process. You must clearly record and retain data on the HS Code, weight, and origin evidence (e.g., Certificates of Origin, Supplier's Declarations) for each input polymer. These documents serve as critical evidence during customs origin verifications.

In conclusion, the proviso for HS 3907 goes beyond simple tariff shifts by mandating a specific weight ratio of regional polymers to ensure substantial transformation. Accurate understanding and calculation of this rule are essential for utilizing preferential tariff benefits. If the production process involves complex mixtures, seeking professional advice to ensure precise weight measurement and origin management is recommended.