Best 3way Stopcock

Eisco Labs Borosilicate Burette w/PTFE Stopcock - 100mL Cap, 0.2mL Grad, Class B

CLASS B || ± 0.10mL tolerance & 0.20mL graduations as per DIN/ISO 385.
STOPCOCK || Includes an attached PTFE straight bore stopcock.
INDUSTRIAL QUALITY || Burette is made of precisely bore, high-quality, heavy-duty Borosilicate 3.3 glass.
BLUE PRINTING || Features chemical resistant blue printing.

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CLASS B || Class B, ± 0.10mL tolerance as per DIN ISO 385 standards for precision.
EASY-TO-READ || Burette has chemical-resistant blue printed scale in 0.10mL graduations.
PTFE KEY STOPCOCK || Includes an attached PTFE straight bore stopcock.
DURABLE & STURDY || Made of high quality acrylic.
tolerates most dilute minerals, acids, and bases.

Glass Stopcock with PTFE Plug Glass PTFE Stopcocks allow the user to connect a valve inline to a system and allows the user to connect a flexible rubber hose to the stopcock..
There are 2 sizes available with 8mm OD and 2mm bore sizes and 10mm OD and 4mm bore size. 30 days Limited Warranty (defects and craftmanship) ***Notice to Customers: All units are inspected for broken glass or parts before unit is shipped..
30 days Limited Warranty (defects and craftmanship) ***Notice to Customers: All units are inspected for broken glass or parts before unit is shipped..

Materials: acrylic body with a polymethylpentene tip, and a PTFETFE stopcock and plug.
Stopcock is leakproof, with self-lubricating PTFETFE plug.
levels of colorless liquids are easily read through the crystal-clear body.
Excellent for general use, schools, industrial labs and field use.
unaffected by dilute mineral acids and bases except hydrofluoric acid and ammonium hydroxide.
pH range of 1-14 is ideal and up to 5% wt/wt of acids or 30% bases can be used.
not designed for exposure to alcohol and organic solvents.

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50ML / 2000ML || Automatic zero burette with 50ml capacity mounted on a 2000ml reservoir - Includes automatic zero facility.
CLASS B || Class B with 34/35 joint size, 0.10±ml tolerance and 0.10ml sub. divisions - Accurate as per ISO 385.
SCHELLBACH + STOPCOCK || Unique features of Schellbach auto zero burettes include a vertical white stripe with central blue ribbon to facilitate accurate reading of the meniscus and an intermediate PTFE stopcock which facilitates the complete drainage of excess liquid back into the reservoir.
DURABLE & STURDY || Both burette and reservoir are made of precisely bore high quality, heavy duty Borosilicate 3.3 glass - Built to last.
PREMIUM QUALITY || Features chemical resistant blue printing - Individually calibrated to deliver (TD) precise volume - With custom foam packaging for safe transport and storage - All contents are included in a single package.

DESIGN----This schlenk flask is comprised of a single neck round bottom flask which can be heated directly in an open flame or heating mantle,ideal for reflux reaction in air-sensitive chemistry.With 2mm glass stopcock having a constant pressure retention device.With a standard taper joint on the single neck attaching to lab glassware for adding ,transferring or reflux..
USE----This schlenk flask with glass stopcock is usually used as a reaction flask in air-sensitive chemistry.The 7mm glass stopcock connects to the schlenk line allowing the flask to be evacuated or filled with gases (usually inert gases).The taper joint at top permits easy transfer of liquids or solids,it may attach an addition funnel ,reflux condenser, magnetic stirring shaft, vacuum flow control adapter to assemble a reaction setup..
DIMENSIONS----This round bottom flask is designed with 2mm glass stopccok on side-arm ,with 24/40 standard taper joint,which can be stopped by a glass topper or 14# rubber septum.Capacity of 100mL..
HEAVY WALL ---This schlenk flask is heavy-wall designed , made by hand-blowing according to ASTM E438 ,made of high-quality borosilicate glass and annealed at 806 degree Celsius ,can be heated directly in an open flame and can withstand typical laborator....

DESIGN----The pressure equalizing funnel is a special type of dropping funnel .Comparing to the ordinary cylindrical dropping funnel and pear-shaped separatory dropping funnel,it is designed with an additional glass tube at side from the top of cylindrical body to the tube between the stopcock and lower male joint.The funnel features a graduated cylindrical tube as main body,with standard joints at top and bottom,a PTFE stopcock above the lower joint..
ADVANTAGE---A pressure equalizing funnel is used to add exact amounts of liquid to the receiving flask slowly and smoothly.With the side narrow-bore tube,the liquid form the funnel drops smooth without having to remove the glass joint stopper.In a reflux reaction,the funnel will be attached to one neck of the receiving flask,while the reflux condenser will be placed on the other neck.It is also ideal to handle air-sensitive reagents in a sealed,inert-gas environment..
DIMENSIONS------This graduated addition funnel has a capacity of 250mL,with 24/40 top and bottom joints, with a 4mm PTFE stopcock above the lower male joint..
HEAVY WALL ---This dropping funnel is heavy-wall designed , made by hand-blowing according to ASTM E438 ,made of high-quality borosilicate glass and annealed at 800 degree Ce....