Glassware

A bubbler, also known as a gas washer or Drechsel flask, is a piece of borosilicate glass laboratory equipment designed for washing or drying gases.

Its main features are:

Material: Made of borosilicate glass, it offers excellent resistance to thermal shock and chemical agents.

Design: It consists of a main flask with a standard ground joint, equipped with two glass tubes. One of the tubes immerses the washing liquid, while the other serves as an outlet for the treated gas.

Use: It is used to bubble a gas through a liquid to purify, dry, or react it.

Capacities: Available in various capacities, such as 100 ml, 250 ml, 500 ml, or 1000 ml, depending on the experimental needs.

A glass Buchner funnel.
Here are its main features:

Material: Made of borosilicate glass, offering high chemical and thermal resistance.

Filter disc: Incorporates a sintered glass disc (or “frit”) instead of a filter paper holder, making it useful when conventional filter papers are attacked by reagents (acids or alkalis).

Vacuum connection: Has a side tube with a connection for a vacuum source (often a water pump) to speed filtration.

Ground joint: Equipped with a ground glass cone, allowing a tight connection to other laboratory glassware such as a vacuum flask.

Use: Mainly used for vacuum filtration in the laboratory, particularly for the separation of solids and liquids.

Laboratory burettes are glassware instruments used for the precise measurement of liquid volumes.

Here is some information for purchasing burettes:

• Burettes are graduated glass tubes made of borosilicate glass such as Pyrex, known for their resistance to thermal shock.
• They are used to deliver a precise volume of liquid, particularly during chemical titrations.
• Capacity: 10 ml, with glass or PTFE stopcocks.

Laboratory burettes are glassware instruments used for the precise measurement of liquid volumes.

Here is some information for purchasing burettes:

• Burettes are graduated glass tubes made of borosilicate glass such as Pyrex, known for their resistance to thermal shock.
• They are used to deliver a precise volume of liquid, particularly during chemical titrations.
• Capacity: 25 ml, with glass or PTFE stopcocks.

The burette stand features the following:

Materials:
Made of high-quality aluminum alloy or plastic for the clamp, and metal (such as iron or aluminum) for the stem and base, providing durability and corrosion resistance.

Functionality:
Designed to securely hold burettes during laboratory titration experiments, particularly on a titration table.

Clamp Design:
The clamp is often a “butterfly” or “double” type, allowing two burettes to be held simultaneously. Its jaws have sufficient elasticity to hold the burettes securely without obscuring the graduations.

Stability:
The heavy base and sturdy stem ensure stability during laboratory manipulations.

Use:
Easy to use for securing and adjusting the position of burettes, making it an essential accessory for science laboratories, schools, and factories.

Burettes – Precision Liquid Dispensing Instruments

(For Titrations & Volumetric Analysis)

1. Key Components

2. Technical Specifications

3. Types & Selection Guide

• Digital Burettes: Motorized, programmable dispensing

• Microburettes: For <1 mL volumes (0.01 mL gradations)

• Automatic Zeroing: Self-refilling designs

4. Proper Usage Protocol

1. Rinsing: Pre-wet with titrant solution

2. Filling: Avoid air bubbles (use funnel)

3. Reading: Eye level at meniscus

4. Delivery: Slow, drop-wise near endpoint

5. Calibration & Maintenance

• Verification: Annual calibration with distilled water

• Cleaning: Chromic acid for stubborn residues

• Storage: Vertical position, stopcock grease applied

A Babcock butyrometer, a laboratory instrument used to determine the fat content of milk and dairy products. Its main features are:

Material: Made of high-quality borosilicate glass, conforming to USP Type I and ASTM E438, Type I, Class A requirements.

Graduation: Features a graduated neck with permanent brown markings for direct measurement of fat percentage, e.g., up to 50% for cream or 0.5% in 0.01% increments for skim milk.

Design: Includes a reaction vessel body.

Use: Designed for use in Babcock testing procedures for determining fat content, with a sample size of 18g.

Compliance: Meets specific standards such as ASTM E1043, Type II A, USP Type I, and ASTM E438, Type I, Class A.

A Cannon-Fenske Opaque Capillary Viscometer.

Its main features are:
Measurement Type: It is designed to measure the kinematic viscosity of transparent and opaque Newtonian liquids.

Conformity to Standards: It is manufactured and used in accordance with international standards such as ASTM D445, ISO 3104, and ASTM D2170.

Design: It is a reverse-flow type U-tube viscometer, allowing the measurement of liquids whose meniscus cannot be easily observed with other types of viscometers.

Sample Volume and Bath Depth: The minimum sample volume required is 12 mL, and the minimum bath depth is 230 mm (9 in).

Calibration: It is supplied with a calibration certificate and an instruction sheet, and both calibrated and uncalibrated versions are available.

Material: It is made of high-quality glass.

Centrifuge tubes have several distinct characteristics:

Material: They are made of glass (often borosilicate glass for thermal and chemical resistance).

Bottom Shape: They come in conical bottoms (to promote pellet sedimentation) or round bottoms (for general applications).

Graduations: These tubes are graduated to allow precise volume measurement, while others are not. The graduations are in milliliters (ml).

Caps/Closures: They are equipped with screw caps for a tight seal, or plain necks without caps.

Strength: Centrifuge tubes are designed to withstand high centrifugal forces (expressed as RCF or xg).

Sterility: They can be supplied sterile, particularly for cell culture.

Volume: They are available in a range of sizes, typically from a few milliliters to 50 ml or more.

A coil is a spiral condenser, also called a serpentine condenser or Graham condenser.

Its main characteristics are as follows:

Form and function: It is a glass tube wound in a helix (solenoid shape) inside an outer shell. It is designed to serve as a refrigerating instrument, primarily in stills or distillation and reflux rigs in chemistry.

Operating principle: A hot gas or vapor passes through the helical tube, while a refrigerant liquid (water) circulates in the outer shell, around the coil. Indirect contact with the cold liquid causes the gas or vapor to condense.

Material: It is made of glass.

Use: It is used to condense vapors during chemical reactions requiring reflux or to separate components by distillation.

The borosilicate glass crystallizing dish has the following characteristics:

Material: Made of borosilicate glass 3.3, it offers high resistance to temperature and thermal shock.

Shape and Design: It is a shallow, flat-bottomed cylindrical container with a pouring spout for easy transfer of liquids.

Use: Ideal for evaporative crystallization in the laboratory.

Resistance: It is resistant to cold alkaline solutions and strong acids (except hydrofluoric acid and concentrated hot phosphoric acid).

Sterilization: It can be sterilized in an autoclave, withstanding high temperatures (up to 500°C).

Stability: Its wide base ensures good stability.

Other Features: It features high purity (SiO2 >99.99%), good light transmission, and excellent thermal shock stability.

A spectrophotometric cuvette, specifically a quartz cuvette suitable for UV analysis (as indicated by the designation “UV -6030-“).
A cuvette is a small, transparent container, usually square or rectangular, used in laboratories to hold samples (most often liquids) during spectroscopic analyses, such as spectrophotometry, fluorimetry, or colorimetry.

Characteristics and Uses:
Material: Cuvettes are made of glass. Cuvettes are suitable for analyses in the ultraviolet (UV) region, in addition to the visible and infrared, thanks to their wide spectral transmission range.

Function: They measure the absorbance or transmission of light through a sample, providing information about its concentration or composition.

Path Lengths: They are available with different optical path lengths.