Watch Glass (Pack of 12)
Product Code : SCL-CLE-11901
The StemAids Watch Glass is a multipurpose laboratory instrument engineered for weighing, drying, and shielding applications. Its characteristic shallow-concave profile provides a high surface-area-to-volume ratio, making it ideal for the evaporation of small liquid volumes or as a protective cover for beakers. Manufactured from high-clarity Borosilicate or Soda-lime glass and compliant with ISO 9001:2015 standards, this pack of 12 ensures that student stations are fully equipped for fundamental chemical and biological procedures.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Material |
Grade A Borosilicate Glass 3.3 or Chemical-Resistant Soda-lime |
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Diameters Available |
50mm,75mm,100mm,125mm,150mm |
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Shape |
Uniformly concave with a stable fire-polished edge |
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Edge Finish |
Ground and polished to prevent chipping and ensure user safety |
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Thermal Resistance |
High resistance to thermal shock (for Borosilicate models) |
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Quantity |
Pack of 12 units (Classroom standard) |
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ISO Compliance |
Manufactured under ISO 9001:2015 Quality Management Systems |
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HS Code |
7017.90.10 (Laboratory Glassware) |
Key Pedagogical & Laboratory Outcomes
- Evaporation Interface: Facilitates the study of "Solute Recovery." The shallow curve allows for rapid air-drying of precipitates; learners identify the crystal structure of salts after solvent evaporation.
- Mass Quantification: Enables accurate weighing of solids; learners apply the watch glass as a tare-vessel on a digital balance, protecting the weighing pan from corrosive chemicals.
- Protective Analysis: Supports the analysis of "Vapor Containment"; students evaluate how using a watch glass as a beaker cover prevents dust contamination while allowing for the observation of internal reactions.
- Micro-Reaction Evaluation: In biology, allows students to evaluate small-scale specimens (like seeds or insects) under a magnifying glass or stereomicroscope without the constraints of a deep Petri dish.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade, high-density packaging. Each watch glass is interleaved with protective paper and shrink-wrapped in sets to prevent "glass-to-glass" friction and scratching during maritime transit.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and Material Safety Data Sheet (MSDS).
- Durability: The fire-polished edges are specifically designed to resist mechanical stress, significantly reducing the "chipping" rate common in lower-quality laboratory glass.
Direct OEM Sourcing Advantages
Procuring StemAids Watch Glasses directly ensures vertical manufacturing control:
- Optical Clarity: Direct oversight of the glass-forming process ensures a crystal-clear surface with no seeds, bubbles, or striations, allowing for unobstructed observation of specimens.
- Dimensional Uniformity: We ensure that every watch glass in the pack of 12 has an identical diameter and curvature, allowing them to stack perfectly and fit standard beaker sizes.
- Direct Factory Inventory: Guaranteed availability of all sizes, from 2-inch (50mm) to 6-inch (150mm), to support specific departmental needs.
- Quality Assurance: Every batch is inspected for "strain points" in the glass to ensure safety when the watch glass is placed over a heating beaker.