BURETS
42
Serialized Class A / Class B
DWK Life Sciences offers unmatched quality in materials and craftsmanship. Our selection of burets reflects many notable innovations. All have a high resistance to both chemical attack and mechanical shock. Only the finest accurate-gauge or precision-bore heavy-walled tubing is used to insure precise calibration and long service. Colored markings, large numerals and sharp, fine-line divisions make these burets easy to read; markings on scales are permanently fused. Most burets are supplied with KIM-KAP ™ dust caps. Careful study of the complete line will enable you to realize full economy. For example, you may buy general purpose burets without polytetrafluoroethylene (PTFE) stopcock plugs thus permitting a savings. Stopcocks accepting glass plugs have a 1:10 standard taper and satin finished surfaces (ASTM E675). PTFE plugs have a 1:5 taper and are engineered with a mirror finish barrel to assure leakproof seating, smooth turning, and correct alignment (ASTM E911). PTFE plugs are self lubricating, non-contaminating and will not freeze in the stopcock barrel, even after repeated use with strong alkali solutions. When not in use or for prolonged storage, loosen plug to prevent cold flow distortion into the glass barrel. Burets with side filling tubes use 1/4 inch I.D. flexible tubing. Delivery end of pinch clamp style burets accept 5/16 inch I.D. tubing except for 17081 dispensing burets which utilize 3/8 inch I.D. tubing. When you need a buret, DWK Life Sciences has exactly what you need. Stopcocks with polytetrafluoroethylene (PTFE) plugs • Airtight fit to prevent leakage. • 1:5 taper to prevent binding over a wide temperature range. • Smooth barrel finish to provide for easy turning without grease — a source of possible contamination. • Non-freezing feature due to the chemical inertness of PTFE, particularly valuable with alkaline solutions. • Sturdy threads fine enough to permit easy adjustment. • Rubber washer between the PTFE washer and nut to maintain uniform tension. • Stopcocks are designed to comply with ASTM Specification E911.
Buret Types
Funnel Fill Buret
Reservoir Fill Buret
14612F
17054F
Serialized and Certified Class A Burets with Straight Bore PTFE Stopcock Used for general purpose titrations requiring traceable volumetric accuracy.
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Precision bore buret is permanently marked with an individual serial number and is traceable to NIST standards Supplied with a Certificate of Graduation Accuracy Delivery stem of the 10 mL size is 115 mm long to meet requirements of potentiometric titration burets (ASTM D664) Supplied with a chemically-resistant, self- lubricating PTFE stopcock plug and a KIM-KAP™ dust cap Easy-to-read durable white ceramic enamel scale
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Class B Straight Bore Burets with Glass Stopcock Used in general purpose volumetric analysis and titrations where Class B tolerances are appropriate.
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Funnel fill style buret
Replacement 2 mm straight bore stopcock plug is 821001-0002 Designed from ASTM Specification E287, Class A requirements Manufactured to the specifications found in ASTM E694 Calibrated to the accuracy requirements found in ASTM Specification E542 Manufactured from 33 expansion, expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements
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Funnel fill style buret
Replacement 2 mm straight bore glass stopcock plug is 801001-0002 Easy-to-read durable black ceramic enamel scale Designed from ASTM Specification E287, Class B requirements Manufactured to the specifications found in ASTM E694 Calibrated to the accuracy requirements found in ASTM Specification E542 Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements
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Capacity; Tolerance (mL)
Overall Length (mm)
Part Number
Case Qty
17027F-10 17027F-25 17027F-50 17027F-100
10; ±0.02 25; ±0.03 50; ±0.05 100; ±0.10
664 614 745 791
1 1 1 1
Capacity; Tolerance (mL)
Overall Length (mm)
Part Number
Case Qty
17026-50
50; ±0.10
738
1
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