Ask a research-administration question
Answers are drawn from CASRAI and the rest of the CASRAI corpus, with a link to every source.
Answers are AI-generated from CASRAI’s own published pages and can be wrong, so check the linked sources before relying on one; your question is logged without personal data — never sold, never used to train a third-party model — to show us what CASRAI is missing, so please do not type personal or confidential details. How we use this
CASRAI is the reference for research administration — bookmark it for the next question.
USA Lab
USA Made 1 Neck Spherical Round Bottom Flask - 35/20
$79.00 - $149.00
In stockPrice varies by Size.
USA-made single-neck spherical round bottom flask with an S35/20 joint, in 1 L and 2 L. The spherical joint allows some flexibility in mating angle.
Choose Size to continue.
Buying through procurement?
Generate a formal quotation for 1 × this item, plus our W-9 — everything your finance department needs to raise a purchase order.
Choose Size to continue.
Description
The Made in USA S35/20 Round Bottom Spherical Flask is your classic RBF, except its made of one of the highest rated glasses in America.
The spherical joining method allows some flexibility in the mating angles of the pieces being joined, which can be particularly important with heavy flasks or long pieces of glassware that would otherwise be difficult to support and potentially snap under bending loads.
Frequently asked questions
What sizes are available?+
1000 mL (1 L) and 2000 mL (2 L).
What is the joint?+
S35/20 spherical. USA Lab note the spherical joining method allows some flexibility in the mating angles, unlike a taper joint.
Related products
Round Bottom Flask - 1 neck 24/40 - Various Sizes
Single-neck round bottom flask with a 24/40 standard taper ground glass joint, available in 250 ml, 500 ml, 1000 ml, 2000 ml and 5000 ml. The 24/40 joint mates directly with 24/40 rotovap adapters, condensers and stoppers, including the 2L rotovap bump trap adapter listed separately.
2-Neck Round Bottom Flask – Borosilicate 3.3 Glass
Two-neck round bottom flask in 3.3 borosilicate glass, listed in nine size and joint combinations from 250 mL to 10 L. Smaller sizes are listed at 24/40; the 2 L, 5 L and 10 L options pair a 34/45 or 45/50 centre joint with a 24/40 side joint.
