Top critical review
3.0 out of 5 starsNOT Class A as described.
Reviewed in the United States on December 26, 2014
At the time of purchase (2014 November 11) this item is being listed as a "Class A Graduated Cylinder" in both the "Product Features" and "Product Description". The item I received from seller "Lake Charles Manufacturing" is clearly Class B, which is NOT a small discrepancy for laboratory glass. One can only hope that it is actually made of borosilicate (Pyrex) as also stated... Whether Class A or B, the ASTM E1272 - 02(2012) Standard does allow "least" graduation marks of 0.2 on a 10 mL cylinder with omission below 1 mL, which is what this item displays.
The glass itself seems to have come from a decent manufacturing process with no obvious burrs, chips, or malformed surfaces on the functional areas. The graduation marks appear to be of a type that will resist a good deal of punishment. The specimen I received performed accurately within Class B specifications (+/- 0.2 mL) when measured on a balance (scale) with 20°C distilled water at 1 mL increments all the way up to the 10 mL mark. With the naked eye, deviation from zero was in the same amount and direction over the entire range, which is a good thing. I was pleasantly surprised by the results, although I will leave it at that since several other reviewers have expressed dissatisfaction with their results in this regard (meaning "your mileage may vary").
Dimensions measured at three points with a digital caliper and averaged:
Cylinder O.D. (Outside Diameter) ~ 16 mm.
Cylinder I.D. (Inside Diameter) ~ 12 mm.
Cylinder wall thickness ~ 2 mm.
Overall height (including the (3) extruded glass nubs/feet on base) ~ 153 mm.
The top/lip of the cylinder is extruded a bit; thickness measures ~ 2.15 mm.
The pour spout extends ~ 1.5 mm making the O.D. at that point ~ 17.5 mm.
