Lab Glassware Stopper
Solid vulcanized rubber stopper for sealing laboratory flasks and test tubes, resistant to chemicals. HTS 4016.99.1500 for other rubber stoppers/closures.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If bundled with laboratory glassware
Glass laboratory articles include rubber components as sets.
If phenol formaldehyde 'rubber' substitute
Synthetic plastic stoppers in Chapter 39.
If extra-large industrial sizes
Non-standard lab sizes may fall under general rubber articles.
Not sure which classification is right?
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Import Tips & Compliance
• Include chemical compatibility certifications (e.g
• for acids/bases)
• Size standardization documentation prevents 'custom part' reclassification
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