FoldTier 6 Pcs Borosilicate Glass Tube 12mm OD 2mm Thick Glass Blowing Tubes with Cleaning Brush (Clear,4 Inch)

Superior thermal shock resistance. This borosilicate glass tube is a critical component in my high-temperature chemical processing manifold. It exhibits remarkable thermal stability under rapid temperature cycling, maintaining structural integrity without stress fracturing. The optical clarity remains pristine even after repeated exposure to harsh reagents. Precisely dimensioned and exceptionally durable.

Great product that handles heat very well!

They do not break easily and none were broken when they came in. They were a little thin but it hasn't been a problem for me. Don't let the black spots build up because it will cause cracks and catch fire while you are using them.

I ordered a 5-pack of clear 4 inch glass tubes and was very happy with the product. The price was excellent for the value. They are thick, durable, and good quality. The cleaning brush/tool that was included is not very strong/long/affective, but it was a nice touch and would be excellent if it was made for the length and width of the tubes I was purchasing.

Smaller that expected