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Two black rubber stoppers, size 10-1/2, conical form factor, matte finish

MIDWEST FASTENER CORP

MIDWEST FASTENER CORP 65903 No 10-1/2 Black Rubber Stoppers 2PK laboratory supply

SKU CH-SSH6-DN6EC

Seals bottle openings with two size 10-1/2 black rubber stoppers for laboratory use

  • Seals bottle openings with a secure fit
  • Black rubber construction resists chemicals and wear
  • Number 10-1/2 size fits standard labware
  • Two stoppers per pack supply a spare
  • Prop 65 notice discloses regulated substances

Laboratory rubber stoppers

These black rubber stoppers are supplied as a two-pack for laboratory use. They fit standard bottle openings to provide a temporary seal during experiments or storage. The stoppers are new and ready for immediate deployment in scientific or educational settings.

Chemical exposure warning

California Proposition 65 notices indicate this product contains a chemical known to the state to cause cancer and birth defects or other reproductive harm. Users should handle the stoppers with appropriate protective equipment and follow institutional safety protocols. The warning applies to the material composition of the rubber itself.

Two-piece capacity limit

The pack contains exactly two stoppers, which covers a single sealing task or provides one spare. Laboratories requiring multiple simultaneous seals will need additional packs. The quantity suits small-scale work but does not scale to high-throughput applications without repeat orders.

How it compares

Measured against everything we stock in Lab Equipment & Supplies, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 96% of the 734 comparable items (median $60.99).

Specifications

Product
Brand nameMIDWEST FASTENER

Questions about this item

Which stopper size fits a No 10-1/2 bottle opening?

The stoppers are sized No 10-1/2 to match that specific bottle opening.

What does the California Proposition 65 warning mean for daily lab use?

The product contains a chemical the State of California identifies as causing cancer and reproductive harm; handle with standard lab precautions.

How does the rubber material perform as a temporary seal?

The black rubber stoppers are designed to temporarily seal bottle openings in laboratory settings.

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