Borosil Measuring Cylinder
Description
Technical Parameters
As a basic measuring instrument in the laboratory, the core function of borosil measuring cylinder is to achieve accurate quantitative measurement of liquid volume through the scale markings on the glass container wall. Its design follows the ISO 4788 international standard and adopts a vertical cylindrical structure. The bottom is equipped with a wide legged base to ensure stability, and the upper edge is designed with a single-sided eagle beak diversion port to optimize the liquid pouring operation. This instrument plays a crucial role in fields such as chemical analysis, environmental monitoring, and biopharmaceuticals, and its measurement accuracy directly affects the reliability of experimental data.
In the laboratory system, it forms a three-level measurement system with pipettes and burettes. Pipettes are suitable for precise transfer of fixed volumes, burettes are used for dynamic volume control, and borosilicate measuring cylinders cover a wide range of 5mL to 5000mL, making them particularly suitable for scenarios such as solution preparation and reagent dispensing that require flexible volume adjustment. Its transparent glass material and millimeter scale lines allow experimenters to visually observe the position of the liquid meniscus, ensuring accurate readings.
Parameter
Material characteristics and technological breakthroughs
Modern borosilicate measuring cylinders commonly use the German Schott DURAN ® Or domestically produced Boro 3.3 standard high borosilicate glass, with a chemical composition of SiO ₂ content of over 80% and B ₂ O3 accounting for 12% -13%. This ratio endows the material with excellent physical properties:
Thermal stability: The coefficient of linear expansion is only 3.3 × 10 ⁻⁶/℃, which can withstand extreme temperature differences from -70 ℃ to 500 ℃, avoiding the risk of explosion caused by thermal shock.
Mechanical strength: The Mohs hardness reaches 6.5, and the impact resistance is three times that of ordinary soda lime glass. With a thickened wall thickness design, it can withstand daily laboratory collisions.
Chemical inertness: Highly resistant to concentrated sulfuric acid, hydrofluoric acid (excluding), organic solvents, etc., does not undergo chemical reactions within the pH range of 0-14, ensuring the service life of the measuring cylinder.
Precision manufacturing process system
Forming technology: Using vertical tube pulling method combined with CNC spinning process, the thickness error of the cylinder wall is controlled within ± 0.1mm, ensuring the perpendicularity of the scale line and the cylinder axis.
Scale printing: Mainstream manufacturers use Marabu imported ink from Germany, which is sintered at high temperature of 600 ℃ to form a glazed scale layer. Borosil measuring cylinder acid and alkali corrosion resistance reaches Grade A of GB/T 6582 standard, and the scale clarity retention rate is greater than 98% after continuous cleaning for 500 times.
Edge treatment: The eagle beak mouth adopts CNC numerical control grinding technology, and the chamfer radius is controlled at 0.3-0.5mm, which ensures stable liquid flow rate and avoids the risk of scratching by experimental personnel during operation.
Product classification and functional characteristics
The regulation of the grinding process by key parameters
Classic round bottomed measuring cylinder
The specification covers 5mL-2000mL, and the minimum division value expands with the increase of capacity
Typical applications: Middle school chemistry experiments, conventional solution preparation
Representative product: Tianbo SP-TBLT series, with a 250mL measuring cylinder wall thickness of 3.2mm and a compressive strength of 0.4MPa
Hexagonal base measuring cylinder
DURAN ® Patent design enhances anti overturning ability through hexagonal base
Stability test data: The verticality deviation can still be maintained at a 15 ° tilt table with a deviation of less than 0.5 °
Applicable scenarios: dynamic environments such as feeding large reactors and field sampling
Stoppered measuring cylinder
The frosted glass stopper forms an airtight structure with the cylinder, with a leakage rate of less than 1 × 10 ⁻⁹ Pa · m ³/s
Typical applications: Packaging of volatile reagents, preservation of standard solutions
The product of Jiangsu Runhong Science and Education Equipment Co., Ltd. has a tolerance of IT6 for the fit between the plug body and the cylinder mouth
Measuring cylinder
Adopting a full capacity scale design, in compliance with ISO 648 standard
Accuracy index: A-level measuring cylinder has a capacity tolerance of ± 0.1mL (100mL specification) at 20 ℃
Mainly used for standard solution calibration and capacity analysis
Laser graduated cylinder
Femtosecond laser engraving technology achieves a scale accuracy of 0.01mm
Compared to traditional printing techniques, the wear-resistant life of the scale is increased by 10 times
Representative product: ERTAREE Class A+series, certified by CNAS laboratory
RFID tracking cylinder
Built in NFC chip for full lifecycle management
Functional modules: Usage record traceability, calibration cycle reminder, damage warning
Typical applications: GMP workshops in pharmaceutical companies, third-party testing laboratories
Application scenarios and operational standards
Typical application areas
chemical analysis
In acid-base titration, use a 25mL graduated cylinder with a pipette to achieve three-stage dilution
In the field of environmental monitoring, a 500mL borosil measuring cylinder is used for reagent packaging in COD determination
biopharmaceuticals
When preparing cell culture medium, use a 1000mL graduated cylinder to mix large volume solutions
GMP workshop requires the use of measuring cylinders with RFID chips to achieve traceability of the culture medium preparation process
Food Testing
In pesticide residue analysis, a 50mL volumetric flask is used for volume control of organic solvent extraction solutions
When testing the sugar content of beverages, a 250mL graduated cylinder is used in conjunction with a refractometer
Standard Operating Procedure
Pre use inspection
Implement the "three checks" system: check for appearance defects, check for clarity of markings, and check for the validity period of measurement certificates
Typical case: A pharmaceutical company caused a culture medium contamination accident due to failure to inspect the cracks in the measuring cylinder
Reading standards
Following the principle of "three lines in one": the line of sight, the lowest point of the meniscus, and the scale line are on the same horizontal plane
Error analysis: A 1 ° viewing angle deviation can lead to a 0.4% volume reading error
Cleaning and maintenance
Recommended procedure: Rinse with pure water → Soak in chromic acid solution (non plastic measuring cylinder) → Rinse with pure water three times → Dry
Prohibited List: It is prohibited to use steel wire balls or strong alkaline solutions to clean high borosilicate glass
Superiority
The superiority of borosilicate volumetric cylinder material is mainly reflected in its unique properties of high borosilicate glass, which performs well in thermal stability, chemical stability, mechanical strength, transparency, etc., providing reliable guarantee for laboratory measurements. The following is a detailed analysis of its superiority:
Extremely low thermal expansion coefficient: The linear expansion coefficient of high borosilicate glass is (3.3 ± 0.1) × 10 ⁻⁶/K, which is only one-third of that of ordinary glass. Under extreme temperature differences ranging from -20 ℃ to 500 ℃, its size changes are minimal, avoiding the risk of rupture caused by thermal stress. For example, after high-temperature sterilization, direct immersion in cold water for cleaning can still maintain structural integrity.
Thermal shock resistance: According to the ISO3587 standard, borosilicate glass products with a diameter less than 100mm shall have a thermal shock resistance temperature of not less than 120 ℃. This characteristic gives it significant advantages in experimental scenarios that require repeated heating or rapid cooling, such as the rapid cooling step in solution preparation.
Acid and alkali corrosion resistance: High borosilicate glass has high resistance to strong acids (such as concentrated sulfuric acid, hydrochloric acid), strong bases (such as sodium hydroxide solution), and various organic solvents. Its acid resistance can reach level 1 of the International Organization for Standardization 195 standard, and its water resistance can reach level 1 of the 719 standard. It can store corrosive reagents for a long time without undergoing chemical reactions.
Chemical resistance: When exposed to chemical reagents for a long time, the surface of high borosilicate glass will not dissolve or precipitate, ensuring the measurement accuracy and service life of the measuring cylinder. For example, in the long-term storage of heavy metal ion solutions, the concentration measurement error can be controlled within ± 0.05%.
High strength and hardness: The tensile strength of high borosilicate glass reaches 40-120N/mm ², the Mohs hardness is 6.5, and the impact resistance is three times that of ordinary soda lime glass. Combined with thickened wall thickness design (such as 3.2mm or more), it can withstand daily laboratory collisions without damage.
Anti fracture properties: When fracture occurs, high borosilicate glass will form large cracks instead of crushing into particles, reducing the risk of injury to experimenters. Its ultimate tensile strength reaches 35-100N/mm ², and it can maintain structural integrity under external impact.
High transmittance: The transmittance of 2mm thick high borosilicate glass can reach 92%, and with the millimeter scale markings etched by laser, experimental personnel can clearly observe the position of the liquid meniscus. In the volume measurement of low concentration solutions, the reading error can be controlled within ± 0.02mL.
Low dispersion characteristics: The refractive index of high borosilicate glass is 1.47, and the glass stress optical constant is 3.8 × 10 ⁻⁶ mm ². Borosil measuring cylinder can reduce chromatic aberration interference and improve the accuracy of volume measurement when observing colored liquids.
Precision molding process: By using the vertical tube pulling method combined with CNC spinning technology, precision control of the cylinder wall thickness error within ± 0.1mm can be achieved. Laser engraving technology achieves a scale accuracy of 0.01mm and a wear resistance life that is 10 times longer than traditional printing processes.
Easy to clean features: The smooth glass surface has no dead corners, and with a chemically resistant glaze scale layer, it can be deeply cleaned using chromic acid solution or organic solvents without damaging the surface. After 500 consecutive washes, the clarity retention rate of the scale is still greater than 98%.
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