Overview
ASTM E1095-99(2022), titled Standard Specification for Common Laboratory Glass Funnels, is a globally recognized ASTM standard addressing the requirements for glass funnels used in laboratories. This specification ensures quality and performance for a variety of laboratory glass funnels, including both filter funnels and filling or powder funnels. The standard supports the consistent manufacturing, classification, and usage of laboratory glassware, contributing to safety and efficiency in laboratory environments.
The scope of ASTM E1095-99(2022) covers general laboratory glass funnels, detailing their material, dimensional, and design requirements, and aligns with international standardization principles as endorsed by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Key Topics
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Types and Classes of Funnels
ASTM E1095-99(2022) classifies laboratory glass funnels into four main types, each designed for different applications:
- Type 1: Common laboratory funnels with a smooth inner surface, further divided into:
- Class A – Short stem
- Class B – Long stem
- Class C – Without stem
- Type 2: Laboratory funnels with a fluted inner wall (grooved design), divided into:
- Class A – Short stem
- Class B – Long stem
- Type 3: Ribbed inner wall funnels with raised ribs extending from the rim toward the stem, also divided into Class A and B.
- Type 4: Filling or powder funnels with short, wide-diameter stems for rapid transfer of powders or granules.
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Material and Thermal Performance
Funnels must be manufactured from laboratory-grade glass meeting ASTM E438 specifications and must conform to maximum permissible thermal residual stress requirements per ASTM E671.
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Dimensional and Design Criteria
The standard specifies dimensions for funnel body, stem length, diameter, and wall thickness, ensuring compatibility and interchangeability in laboratory settings. Each funnel must have a securely sealed bowl and stem, and designs must prevent flow restrictions during use.
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Marking and Identification
Each funnel must be permanently marked with the manufacturer's name or trademark, ensuring traceability and quality assurance.
Applications
ASTM E1095-99(2022) laboratory glass funnels are widely used for:
- General Liquid Transfer: Ensuring safe and accurate pouring of liquids into containers with narrow openings.
- Filtration: Used with filter paper to separate solids from liquids in analytical and preparative laboratory procedures.
- Powder and Granular Transfers: Type 4 funnels specifically facilitate the handling and decanting of powders and granules without spillage.
- Sample Preparation: Essential in analytical laboratories, clinical labs, research institutions, and educational laboratory environments for preparing samples and reagents.
The standard supports laboratory glassware procurement and quality control processes by providing requirements for performance, design, and packaging. Laboratories, manufacturers, and suppliers rely on ASTM E1095-99(2022) to ensure compatibility, safety, and durability of glass funnels in scientific workflows.
Related Standards
For organizations seeking comprehensive laboratory glassware management, these related ASTM standards are frequently referenced alongside ASTM E1095-99(2022):
- ASTM E438: Specification for Glasses in Laboratory Apparatus
- ASTM E671: Specification for Maximum Permissible Thermal Residual Stress in Annealed Glass Laboratory Apparatus
- ASTM E920: Specification for Commercially Packaged Laboratory Apparatus
- ASTM E921: Specification for Export Packaged Laboratory Apparatus
- ASTM E1133: Practice for Performance Testing of Packaged Laboratory Apparatus for United States Government Procurements
- ASTM E1157: Specification for Sampling and Testing of Reusable Laboratory Glassware
By adhering to ASTM E1095-99(2022) and related standards, laboratories can achieve reliable performance, consistent laboratory operations, and facilitate compliance with international laboratory best practices.