Casein Plastic Buttons
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𧡠Casein Plastic Buttons (Milk Protein Buttons)
π HS Code Reference & Clearance Guide | 2026 Latest Tariff Analysis | Professional Customs Strategy
π Part 1: Product Definition & Classification: Do You Really Understand "Casein Buttons"?
Casein plastic, commonly known as milk plastic, is a thermosetting polymer derived from casein, the primary protein in milk. Historically popular in the early-to-mid 20th century, it is valued for its:
- Natural aesthetic: Often resembles horn, bone, or tortoiseshell with beautiful swirls and patterns.
- Workability: Can be polished, dyed, and carved easily.
- Eco-friendly perception: Biodegradable and sourced from renewable dairy byproducts.
In international trade, casein buttons are classified not as "clothing accessories" but as articles of plastics, due to their chemical composition (casein formaldehyde resin).
β οΈ Key Distinction:
- If the button is made of synthetic plastic (e.g., acrylic, polyester, polyamide) β It is a generic plastic article.
- If the button is made of casein plastic (protein-based) β It is still classified under Plastics, but specific attention is paid to material declaration to avoid misclassification under "textile accessories" or "bone/ivory imitations."
π¦ Part 2: HS Code Classification Details (2026 Latest Tariff Authority Comparison)
| HS Code | Product Description | Application Scenario | Material Basis |
|---|---|---|---|
3926.90.90.89 |
Other articles of plastics and articles of other materials of headings 3901 to 3914 | General casein buttons, dyed or undyed, not specified elsewhere | Casein Formaldehyde Resin |
3926.90.90.98 |
Other articles of plastics and articles of other materials of headings 3901 to 3914 | Alternative sub-category for plastic buttons if 3926.90.90.89 is restricted in specific jurisdictions |
Casein Formaldehyde Resin |
6217.10.90.00 |
Other made-up clothing accessories | Incorrect for pure plastic casein buttons; only for fabric-based or mixed textile accessories | β Not Applicable |
9606.22.00.00 |
Press studs and press studs parts | Not applicable; buttons are distinct from fasteners like snaps/zippers | β Not Applicable |
9606.21.00.00 |
Buttons of metal | Not applicable | β Not Applicable |
π Key Reminder:
- Casein plastic is chemically defined as a plastic resin. Therefore, it falls under Chapter 39 (Plastics and Articles Thereof).
- It does not fall under Chapter 62 or 63 (Textiles/Accessories) because it is not a textile material.
- It does not fall under Chapter 96 (Miscellaneous Manufactured Articles) for "other buttons" if a more specific plastic heading (3926) exists.
- HS Code3926.90.90.89is the most common classification for plastic buttons not specified in other sub-headings (like optical, electrical, or molded shapes).
π° Part 3: 2026 Latest Tariff Rate Details (Including Surcharges & Policy Add-ons)
β Applicable Country: United States (US)
β Origin: China (CN)
β Effective Date: From November 10, 2025 (for subsequent imports)
π― 1. 3926.90.90.89 ββ Plastic Articles (Casein Buttons)
| Item | Content |
|---|---|
| Base Rate | 5.3% (ad valorem) |
| USITC Surcharge | +25% (from USITC Footnote 9903.88.01 for China-origin plastic articles) |
| IEEPA Surcharge | +10% (for China/HK products, starting Nov 10, 2025) |
| Total Rate | 40.3% |
| Tax Calculation | CIF Value Γ 40.3% |
| De Minimis Eligibility | β Not Eligible (deny_de_minimis) |
| Legal Basis Path | IEEPA:9903.01.25 β IEEPA:9903.01.24 β USITC:3926.90.90.89 β FOOTNOTE:9903.88.01 |
π Explanation:
- "USITC Surcharge 25%": From Section 301 of the Trade Act, targeting Chinese plastic goods.
- "IEEPA 10%": Additional tariff under the International Emergency Economic Powers Act.
- Total 40.3% is a high tariff, significantly impacting profit margins. Must be factored into pricing strategies.π Note on Casein Plastic:
- Despite being "natural" in origin, casein formaldehyde resin is a synthetic polymer in trade classification.
- Some countries may have different treatments for "bio-based plastics," but the US currently treats all plastic articles, including casein, under standard plastic tariffs.
π οΈ Part 4: Customs Clearance Practical Advice (Battle-Tested Pitfall Guide)
β 1. Documentation Checklist (All Must Be Provided)
| Document | Mandatory | Description |
|---|---|---|
| β Product Specification Sheet | βοΈ | Detail composition: "Casein Formaldehyde Resin," no metal cores, no textile threads. |
| β Material Safety Data Sheet (MSDS) | βοΈ | To prove non-hazardous nature; casein buttons are generally non-toxic. |
| β Product Photos (High Resolution) | βοΈ | Show texture, color, and any markings. Must clearly show it is not metal, wood, or fabric. |
| β Commercial Invoice | βοΈ | Must explicitly state "Buttons, Made of Casein Plastic" and HS Code 3926.90.90.89. |
| β Packing List | βοΈ | Confirm weight and quantity. |
| β CertIFICATE of Origin (CO) | βοΈ | Required for tariff calculation; if not China-origin, may reduce surcharge. |
β 2. Declaration Tips (Key Mnemonics)
π₯ "Plastic is Plastic, Don't Call it Textile! Casein is Resin, HS 3926 is the Key!"
| Situation | Correct Declaration | Wrong Practice |
|---|---|---|
| Pure Casein Buttons | 3926.90.90.89 |
Misdeclaring as 6217.10.90 (Textile Accessory) β Higher scrutiny & penalties |
| Buttons with Metal Eyes | Separate declaration or whole article? | If metal eye is integral, may be classified as metal button (9606) or plastic (3926). Consult ruling. |
| Casein Buttons for Medical Use | Same HS Code | No special exemption for medical buttons unless part of a larger device. |
| Bulk vs. Retail Packaging | Same HS Code | Packaging does not change HS code for buttons. |
β οΈ Critical Warning:
- Do not declare as "Clothing Accessories" (6217). Customs may reclassify and apply different duty rates and anti-dumping investigations.
- Do not declare as "Bone or Ivory Imitation" (9606.29). Casein is plastic, not imitation bone. Misclassification leads to delays.
π Part 5: Global Market Customs Comparison (2026 Latest)
| Country/Region | Recommended HS Code | Tariff Rate | Certification Required | Notes |
|---|---|---|---|---|
| πΊπΈ USA | 3926.90.90.89 |
40.3% (China) | FDA (if food-contact, though rare for buttons), CPSIA | High tariff due to Section 301. |
| π¨π³ China | 3926.90.90.89 |
5% | None | Low tariff, no surcharge. |
| πͺπΊ EU | 3926.90.97 |
6.5% | REACH, RoHS | No Section 301 equivalent. |
| π¬π§ UK | 3926.90.99 |
6.5% | UKCA, Post-Brexit rules | Similar to EU but with local certifications. |
| π―π΅ Japan | 3926.90.90 |
8.0% | PSE (if electrical, not for buttons) | Moderate tariff. |
π Conclusion:
- USA is the most expensive market for casein buttons from China due to cumulative tariffs.
- EU & UK offer significantly lower tariffs (6.5% vs 40.3%). Consider supply chain diversification if targeting US.
- China remains the primary manufacturing hub due to low domestic tariffs and production efficiency.
π Part 6: Common Mistakes & Pitfall Guide (Blood & Tears Lessons)
β Mistake 1: Declaring Casein Buttons as "Clothing Accessories" (6217)
π Consequence: Customs may reclassify to 3926, backdating duties + penalties. Risk of seizure if intent is proven.
β Mistake 2: Claiming "Natural Material" to avoid plastic tariffs
π Consequence: Casein is processed into formaldehyde resin, classified as plastic. No exemption. False declaration leads to fraud charges.
β Mistake 3: Ignoring MSDS/Compliance Data
π Consequence: US Customs may hold goods for chemical analysis if composition is unclear. Delays of 2-4 weeks.
β Mistake 4: Not Specifying "Casein" in Invoice Description
π Consequence: If described as "Plastic Buttons," customs may apply general plastic rates (same), but if described as "Textile," error occurs. Be specific.
β Correct Practice:
"Buttons, Made of Casein Plastic (Formaldehyde Resin), Non-Metal, Non-Textile, For Garments, Model XYZ, Complies with REACH/RoHS"
π― Part 7: Conclusion: Professional Declaration, Cost Savings, Efficient Clearance!
π― Remember Mnemonics:
πΉ "Casein is Plastic, Not Fabric! HS 3926 is the Key!"
πΉ "USA Tariff High, 40% to Go! Plan Ahead or Lose Cash!"
πΉ "Be Specific, Be Accurate, Avoid Delays and Fines!"
π Pro Tip:
If your casein buttons are originating from Vietnam, India, or Thailand, you may qualify for lower Section 301 surcharges in the US.
Recommendation: Seek Advance Ruling from US Customs if you have large, consistent shipments. This provides legal certainty on classification and tariff liability.
π£ Immediate Action:
π Contact your customs broker + Provide Material Data Sheet + Apply for HS Code Advance Ruling
π Let your casein buttons pass through customs smoothly, efficiently, and profitably!
β¨ Professional Customs Clearance Starts with Accurate Classification!
πΌ Every Percent of Duty Saved is Pure Profit!
Customer Reviews
About HS Code Classification
The Harmonized System (HS) is an internationally standardized nomenclature developed by the World Customs Organization (WCO) to classify traded products. Over 200 countries use the HS system as the basis for customs tariffs, trade statistics, and import/export regulations.
Each HS code follows a hierarchical structure:
- Chapter (2 digits) β Broad category of goods (e.g., Chapter 84: Machinery and Mechanical Appliances)
- Heading (4 digits) β More specific grouping within the chapter
- Subheading (6 digits) β Internationally standardized breakdown, used by all WCO member countries
- National subdivisions (8-10 digits) β Country-specific extensions for further classification, such as US HTSUS 10-digit codes
Correct HS code classification is essential for smooth customs clearance, accurate duty payment, and compliance with trade regulations. Misclassification can lead to customs delays, overpayment of duties, or penalties.
When importing from CN to US, the applicable tariff rates may include:
- Most-Favored-Nation (MFN) rate β The standard duty rate applied to WTO members
- General rate β Applied to countries without trade agreements
- Trade remedy duties β Additional tariffs such as Section 301 (anti-dumping), Section 232 (national security), or countervailing duties
The information provided on this page is for reference purposes only. For official classification, please consult with your local customs authority or a licensed customs broker.