Specific Gravity Bottle
Product Code : SCL-CLE-11916
The StemAids Specific Gravity Bottle, also known as a Pycnometer, is a high-precision glass instrument engineered for the determination of the density and specific gravity of liquids and solids. Calibrated "To Contain" (TC) a precise volume of fluid at a standard temperature (usually 20?C), it utilizes a capillary-bore stopper to ensure that excess liquid is expelled, leaving a perfectly consistent volume for weighing. Manufactured to ISO 3507 standards, it is an essential tool for Physical Chemistry, Petroleum Testing, and Material Science laboratories.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Material |
Grade A Borosilicate Glass 3.3 (Expansion 33) |
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Design |
Pear-shaped or flat-bottomed with a capillary-stopper |
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Capacities |
10ml,25ml,50ml,100ml |
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Stopper |
Precision-ground glass with a central vertical capillary |
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Calibration |
Individual calibration data available for Class A models |
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Temperature |
Standardized for 20?C or 25?C |
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Chemical Resistance |
High resistance to solvents, acids, and fuels |
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ISO Compliance |
Manufactured under ISO 9001:2015 and ISO 3507 standards |
Key Pedagogical & Laboratory Outcomes
- Density Interface: Facilitates student understanding of the relationship between mass and volume. By weighing the bottle empty, full of water, and full of the unknown liquid, learners identify the relative density of substances.
- Volumetric Quantification: Enables high-accuracy measurements; learners apply the pycnometer to calculate Specific Gravity (SG) using the formula:
SG=Mass of equal volume of WaterMass of Liquid
- Purity Analysis: Supports the analysis of "Chemical Identification"; students evaluate the purity of alcohols, oils, or honey by comparing measured density against theoretical standards.
- Solid Displacement Evaluation: Using the "immersion method," students can evaluate the density of small, irregular solids (like sand or metal pellets) by measuring the volume of liquid they displace within the bottle.
Functional Mechanics: The Capillary Principle
The precision of the Specific Gravity Bottle relies on the capillary-bore stopper. When the bottle is filled and the stopper is inserted, excess liquid and air are forced out through the tiny hole. This ensures:
- Zero Air Pockets: Eliminates measurement errors caused by trapped bubbles.
- Constant Volume: The liquid level always stops at the top of the capillary, providing a much higher degree of repeatability than a graduated cylinder.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade, shock-absorbent packaging. Stoppers and bottles are matched and numbered at the factory to ensure a perfect, individual fit; they are secured together to prevent mismatching during transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and an individual Calibration Report for Class A units.
- Durability: The Borosilicate 3.3 glass is resistant to "expansion error," ensuring that the volume remains stable even if the laboratory temperature fluctuates slightly.
Direct OEM Sourcing Advantages
Procuring StemAids Specific Gravity Bottles directly ensures vertical manufacturing control:
- Hermetic Ground Joints: Direct oversight of the diamond-grinding process ensures a leak-proof seal, preventing the evaporation of volatile samples during the weighing process.
- Precision-Bore Capillaries: We ensure the capillary hole is perfectly vertical and consistent in diameter, preventing "dripping" errors.
- Direct Factory Inventory: Guaranteed availability of the standard 25ml and 50ml sizes most commonly used in academic and industrial standards.
- Quality Assurance: Every bottle is gravimetrically tested with distilled water at 20?C to verify that its volume falls within strict ISO tolerances.
