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CR Scientific



Stoppers for laboratory glassware.

Imported, may be either blue or black rubber*.
Top & Bottom Diameters give some guide as to what the stopper will fit. There may be slight variation between lots.

Ideally, the inside diameter of the flask or test tube should be about halfway between the top and bottom diameter of the stopper. Test tubes sizes (e.g., 18 mm) are outside diameters. To select a stopper, measure the I.D. with a vernier caliper.


IMPORTANT:  Please contact us to verify availability of stoppers before you finalize your order.   Many stoppers we've been receiving had to be discarded due to oil, grime, or lack of compressibility.  This seems to be an ongoing issue with more than one factory.  It has made it futile to try to order large quantities of stoppers to keep in stock.  Therefore, we may not have all sizes in stock at any given moment. 



#000 Stoppers, Solid, 1 dozen....................$1.40
Top dia.=12.8 mm; Bottom dia.= 9 mm.
Fits 12 and 13 mm test tubes


Quantity:


#00 Stoppers, Solid, 1 dozen......................$1.50
Top dia.=15 mm. Bottom dia.=10 mm.
Fits 15 and 16 mm test tubes


Quantity:


#00 Stoppers, One-Hole, 1 dozen......................$2.00
Top dia.=15 mm. Bottom dia.=10 mm.
Fits 15 and 16 mm test tubes


Quantity:


#0 Stoppers, Solid, 1 dozen.............................$2.50
Top dia.= 17 mm ; Bottom dia.=13.1 mm.

Quantity:


#1 Stoppers, Solid, 1 dozen........................$2.80
Top dia.=18.6 mm; Bottom dia.=14.4 mm; will fit 18 mm test tubes

Quantity:


#1 Stoppers, One-Hole, 1 dozen......................$3.00
Top dia.=18.6 mm; Bottom dia.=14.4 mm; will fit 18 mm test tubes

Quantity:

#1 Stoppers, Two-Hole, 1 dozen......................$3.30
Top dia.=18.6 mm; Bottom dia.=14.4 mm; will fit 18 mm test tubes

Quantity:

#2 Stoppers, Solid, 1 dozen.......................$3.20
Top dia.=20.4 mm; Bottom dia.=15.2 mm

Quantity:


#2 Stoppers, One-Hole, 1 dozen....................$3.50
Top dia.=20.4 mm; Bottom dia.=15.2 mm

Quantity:


#2 Stoppers, Two-Hole, 1 dozen....................$3.80
Top dia.=20.4 mm; Bottom dia.=15.2 mm

Quantity:


#3 Stoppers, Solid, 1 dozen.........................$3.50
Top dia.=24 mm; Bottom dia.=18.4 mm

Quantity:


#3 Stoppers, One-Hole, 1 dozen.........................$3.80
Top dia.=24 mm; Bottom dia.=18.4 mm

Quantity:


#3 Stoppers, Two-Hole, 1 dozen....................$4.10
Top dia.=24 mm; Bottom dia.=18.4 mm

Quantity:


#4 Stoppers, Solid,
Top dia.=25.6 mm; Bottom dia.=19 mm. Fits 25 mm test tubes.

1/2 doz. (6 pcs).........................$2.40
Quantity:


#4 Stoppers, One-Hole, 1/2 doz. (6 pcs)..........................$2.50
Top dia.=25.6 mm; Bottom dia.=19 mm. Fits 25 mm test tubes.

Quantity:


#4 Stoppers, Two-Hole, 1/2 doz. (6 pcs)....................$2.60
Top dia.=25.6 mm; Bottom dia.=19 mm. Fits 25 mm test tubes.

Quantity:


#5 Solid, 1/2 doz. (6 pcs)........................$2.70
Top dia.=27.1 mm; Bottom dia.=23.5 mm

Quantity:


#5 One-Hole, 1/2 doz. (6 pcs)....................$2.85
Top dia.=27.1 mm; Bottom dia.=23.5 mm

Quantity:


#5 Two-Hole, 1/2 doz. (6 pcs)....................$3.00
Top dia.=27.1 mm; Bottom dia.=23.5 mm

Quantity:


#6 Solid, 1/2 doz. (6 pcs)..................$3.25
Top dia.=32.6 mm; Bottom dia.=25 mm.

Quantity:


#6 One-Hole, 1/2 doz. (6 pcs).................$3.60
Top dia.=32.6 mm; Bottom dia.=25 mm.

Quantity:


#6 Two-Hole, 1/2 doz. (6 pcs)...........................$3.85
Top dia.=32.6 mm; Bottom dia.=25 mm.

Quantity:


#6.5 Solid, 1/2 doz. (6 pcs).............$3.99
Top dia. ; Bottom dia.

Quantity:


#6.5 One-Hole, 1/2 doz. (6 pcs)............$4.29



#6.5 Two-Hole 1/2 doz. (6 pcs)................$4.59



#7 Solid, 1/2 doz. (6 pcs)................$4.79
Top dia. 36.3 mm; Bottom dia. 29.3 mm; Height 30 mm.

Quantity:


#7 One-Hole, 1/2 doz. (6 pcs)..............$4.96
Top dia. 36.3 mm; Bottom dia. 29.3 mm; Height 30 mm; Hole dia. 4.2 mm

Quantity:


#7 Two-Hole, 1/2 doz. (6 pcs).............$5.29

Quantity:


#9 Solid, sold individually............................$2.29 each
Top dia. ~46.4 mm; Bottom dia. ~38.6 mm; Height ~30.5 mm

Quantity:


#10 Solid, sold individually.........................$2.99 each
Top dia. approx. 49.3 mm; Bottom dia. approx. 41.4 mm

Quantity:



#11 Solid, sold individually........................... $3.29 each
Top dia. approx. 55.6 mm; Bottom dia. approx. 47 mm

Quantity:


#11 One-Hole, sold individually....................$3.39 ea.

Quantity:


*We have only a small number of blue stoppers still in stock.  The rest are black.  Depending on the size and whether we have any blue ones left, you may receive blue, black, or a mix of both colors.

Allergy warning: these stoppers may contain natural rubber and could aggravate a latex allergy.

Rubber stoppers can be attacked by nitric acid at room temperature or by other acids (acetic, hydrochloric, sulfuric, etc) at elevated temperature. The rubber does appear to contain some sulfur which may come out as H2S with prolonged exposure to boiling acid vapors.

Certain organic solvents (acetone, xylene, methylene chloride, etc) will also attack rubber.

This item is for general teaching use. It is not for food, drug, or household use. We do not recommend these stoppers for precise analytical work, as they may contaminate samples with mould-release compounds / oils. It is up to the buyer to test a batch to determine suitability for his / her particular application.




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IMPORTANT:  Please contact us to verify availability of stoppers before you finalize your order.   Many stoppers we've been receiving had to be discarded due to oil, grime, or lack of compressibility.  We may not have all sizes in stock at any given moment. 








Catalog
Glass Tubing, Borosilicate - 5, 6, and 7 mm diameters are usually in stock. For use in 1- or 2-hole stoppers. Available by clicking here.

Glassware
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1.)  These stoppers contain natural rubber, which can aggravate latex allergies.


2.)  Never heat a closed container (e.g., a test tube that's been plugged with a solid stopper).


3.)  These are Economy / Student grade stoppers.  They may not be suitable for certain applications.

They are not intended for food, drug, or household use.



4.)  Measurements are APPROXIMATE.  They were taken from stoppers we had in stock at the time.

Measurements may vary slightly between lots (i.e., these may not be suitable for precise engineering uses).  Please see note #3, above.