- 100mm diameter plain watch glass/beaker cover
- Fits Griffen Beaker size 250 - 500ml
- High quality inert flint glass
- Heavy Duty Reusable
213H11 Karter Scientific 100mm Plain Watch Glass Beaker Cover (Pack of 10)
($1.00 / Item)
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Specifications for this item
|Number of Items||10|
|Brand Name||Karter Scientific|
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Karter Scientific® is a registered trademark in United States of America. To maintain quality control, authorized permission is required in the resale of our products. Glass Watch Glass with high chemical durability, thus preventing contamination of solutions. They are molded to the same radius of curvature for convenient stacking. The heavy wall and uniform fire-polished edge provide mechanical strength.
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Mine are only 98 mm, but the edges are smooth and I've only broken one (hit the bench just wrong, oopsy--and no, it was the next day....)
All of the glasses still had grinding powder on the and a couple ad chipped edges.
After cleaning with a mild acid and soap, I found most had abrasive surface scratches on them.
They are not Borosilicate glass as some reviewers have said they are plain Flint glass as stated in the description. I have discarded two glasses but the rest are OK for what I am using them for. I will be sure not to use them when heating liquids in a flask. They should be labeled as defective or second use.
I don't know enough about borosilicate watch glass or Karter Scientific to know where the problem lays. I ordered two boxes of 10pcs. They arrived packed in the product's box, inside a padded envelope, surrounded by crumpled paper inside a box, inside another box. Seemed extreme but....
One glass is cracked and is unusable. A few are scratched. Most the glasses have multiple chips around the edges, though most are very small. Mos, if not al, of the glasses some kind of bubbling or flaw appearing on the convex side of the glass. I tried to scrub it off in the case that it was just dirt or some kind manufacturing residue, but I don't seem to be able to remove it.
I've purchased these for crafting purposes and I think their condition is bad enough I won't have a good end piece, but I have decided to keep them to use for learning. I may try to find a lab technician and see if this is normal for the product.
These were more than adequate for my purpose of covering wine glasses after pouring several sample per person for a cognac tasting. YMMV.