Premium Graduated Cylinder Set - 50mL, 100mL & 250mL - ASTM, Class A - Protective Collars, Hexagonal Base - Blue Graduations - Borosilicate 3.3 Glass - Labs

Laboratory grade. Good item when this level of accuracy is required. Meets our needs.

El empaque donde venían los productos fue hecho a la medida de las probetas, por lo que no daba espacio a que se movieran o desplazaran durante el trayecto de entrega. La entrega fue rápida. El producto está muy bien elaborado, la presentación no le pide nada a marcas más reconocidas de cristalería, y para ser escala A el precio es muy económico. Definitivamente las volvería a comprar.

Excellent product, though fragile if tipped over or dropped. The best way to remove alcohol from gasoline is to add an amount of water equal to the alcohol content. Gasoline and alcohol don't mix very well, but water and alcohol just love each other, so when water is added to 10% gasoline (10% ethanol blend), it bonds with the water molecules, and due to its heavier weight, drops to the bottom of the container, forming a distinct line of separation between the water/alcohol blend and the now pure gasoline. So to make sure you get all of the alcohol out of the gasoline you have to make sure you are adding enough water to equal or better the volume of the alcohol. Putting 100ml of 10% gasoline in a test tube, and then adding 20ml more water will cause the contents of the tube to rise to the 120ml line. After 30 or 40 minutes of being undisturbed, you can see the amount of alcohol by looking at where the line of separation is. It is very easy to see. If it is sitting at the 31ml line, then alcohol makes up 11% of the gasoline volume.

Good and fast

Glass 'graduated cylinders'. If you need to measure liquids relatively accurately (these are not calibrated-traceable volumetric flasks) at a decent consumer-level price these are a great value. Borosilicate glass is relatively thick and cleanable without worrying about solvent damage (except HF, of course) so they clean up nicely. I use them for dispensing motorcycle and aquarium fluids. Bonus: packaged well in custom cut soft foam lined box that is great for safe storage.