Lab cap plugs: top picks

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AI-generated summary · updated October 26, 2026 · verify details before purchase.

1. 

   1 Best overall Pyrex

   Corning PYREX Stopper, Glass, Size 8

   ★★★★☆4.5/5 $51.39

   High-quality borosilicate glass stopper, durable and heat-resistant, ideal for lab flasks.

   • Durable glass
   • Heat resistant
   • Good seal

   • Fragile if dropped

   View on Amazon manufacturer site
2. 

   2 Best value SP Scienceware

   Bel-Art Scienceware Polypropylene Lab Cap, Size 1

   ★★★★☆4.3/5 $28.79 Only 16 left

   Affordable polypropylene cap, lightweight and chemical-resistant, fits standard flasks.

   • Low cost
   • Chemical resistant
   • Lightweight

   • Not autoclavable

   View on Amazon manufacturer site
3. 3 Best chemical resistance

   Sigma-Aldrich PTFE (Teflon) Lab Cap, Size 2

   ★★★★★4.7/5 $20-$35

   PTFE cap offers excellent resistance to aggressive solvents and high temperatures.

   • Superb chemical resistance
   • High temp tolerance
   • Non-stick

   • Expensive

   View on Amazon manufacturer site
4. 

   4 Best for bottles Nalgene

   Thermo Scientific Nalgene Polypropylene Cap, 38-430

   ★★★★☆4.4/5 $168.32

   Reliable polypropylene cap with wide thread, perfect for Nalgene bottles.

   • Good fit
   • Leak-proof
   • Autoclavable

   • Limited size range

   View on Amazon manufacturer site
5. 

   5 Best for precision Generic

   DWK Life Sciences Kimble Glass Stopper, Size 4

   ★★★★☆4.2/5 $695.72

   Ground glass stopper provides tight seal for volumetric flasks, precision ground.

   • Precision fit
   • Tight seal
   • Durable glass

   • Requires grease

   View on Amazon manufacturer site
6. 

   6 Best budget pick United Scientific

   United Scientific Supplies Polyethylene Cap, Size 0

   ★★★★☆4.0/5 $25.80 Only 10 left

   Low-cost polyethylene cap, suitable for general lab use with simple solutions.

   • Very cheap
   • Disposable option
   • Lightweight

   • Limited chemical resistance

   View on Amazon manufacturer site
7. 

   7 Best for storage SP Scienceware

   SP Bel-Art HDPE Lab Cap, Size 5

   ★★★★☆4.3/5 $190.25

   HDPE cap is sturdy and provides good seal for storage bottles, autoclavable.

   • Sturdy
   • Good seal
   • Autoclavable

   • Brittle at low temps

   View on Amazon manufacturer site
8. 

   8 Best flexible cap EISCO

   Eisco Labs Silicone Rubber Lab Cap, Size 3

   ★★★★☆4.1/5 $21.59 Currently unavailable

   Flexible silicone cap, reusable and heat-resistant, easy to fit.

   • Flexible
   • Reusable
   • Heat resistant

   • May slip off

   View on Amazon manufacturer site

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