Overview
EN ISO 9100-2:2005 - Glass containers - Vacuum lug finishes - Part 2: 33 medium (ISO 9100-2:2005) specifies the dimensional and design requirements for a vacuum lug finish with a nominal size of 33 mm medium intended for wide-mouth glass containers. The document defines the finish geometry, sealing area, lead and thread form, and references general tolerances to ensure interchangeability and reliable vacuum closure performance.
Key topics and technical requirements
- Scope: Dimensions and design for the 33 mm medium vacuum lug finish for wide-mouth glass containers.
- Dimensional data: Figures and Table 1 in the standard provide the precise numeric values for key diameters and features. For example, the finish includes an E diameter of 28.65 ± 0.30 mm and a T diameter of 31.15 ± 0.30 mm, with a defined C diameter and sealing envelope shown in the drawings.
- Sealing surface quality: The sealing surface shall be free of checks, dips, crizzles and other defects that could compromise vacuum performance.
- Thread and lead geometry: Thread construction, lead start/end definitions and cutter inclination are specified; stop faces on leads act as cap stops and must be sharp-edged and nearly perpendicular to the E-wall.
- Concentricity and ovality: The standard advises minimizing ovality and keeping E and T diameters concentric to ensure reliable closure seating.
- Tolerances: General tolerances for unspecified linear and angular dimensions are applied in accordance with ISO 2768-1.
- Drawings and table-driven values: Figures 1 and 2 show cross-sections and finish contours; Table 1 lists cutter angles, pitch/threads-per-inch parameters and minimum dimensions for cutters and leads.
Applications and who uses it
- Glass container designers and manufacturers: Use this standard when specifying neck finishes for jars and wide-mouth containers to achieve consistent vacuum lug form and cap compatibility.
- Closure and cap producers: Ensure caps and vacuum closures match the lug geometry for reliable sealing and cap-stopping performance.
- Mould/tooling engineers: Apply the cutter angles, lead profiles and stop-face requirements when designing and maintaining mould cavities.
- Quality assurance and inspection teams: Verify diameters, concentricity, surface condition and lead/stop features to comply with EN ISO 9100-2:2005.
- Packaging engineers and procurement: Specify the standard in procurement documents to guarantee interchangeability across suppliers and markets.
Related standards
- ISO 2768-1 - General tolerances for linear and angular dimensions (referenced for unspecified tolerances).
- ISO 9100 series - Other parts cover additional vacuum lug sizes (Parts 1, 3–14), useful when working across multiple neck finishes.
Keywords: EN ISO 9100-2:2005, glass containers, vacuum lug finishes, 33 medium, wide-mouth, finish dimensions, sealing surface, ISO 2768-1, thread parameters, packaging standards.
