Overview
ISO 11040-3:2012 specifies requirements for seals (elastomeric discs and aluminium caps) used in dental local anaesthetic cartridges for single use. The standard defines acceptable shape, dimensions, materials, performance tests and labelling for these seals, ensuring compatibility with prefilled syringes and safeguarding medicinal product integrity during manufacture, sterilization and storage.
Key topics and technical requirements
- Scope & classification
- Applies to seals for dental local anaesthetic cartridges intended for single use only.
- Two types: Type A (mono‑layer disc) and Type B (double‑layer disc). Thickness ratio for Type B is agreed between supplier and user.
- Shape & dimensions
- Nominal dimensions and tolerances are specified (see figures/tables in the standard); disc diameter must ensure a secure press‑fit in the aluminium cap.
- Materials
- Aluminium caps: conform to ISO 8872 and must be anodized or suitably lacquered.
- Elastomeric discs: made from the formulation approved by the end user; manufacturer must ensure batch conformance to type sample.
- Elastomer must withstand two autoclave cycles at (121 ± 2) °C for 30 min without functional impairment; other sterilization methods require evaluation.
- Performance & testing
- Hardness: nominal hardness ±5 Shore A (ISO 7619‑1) or ±5 IRHD if tested per ISO 48.
- Fragmentation: test per ISO 8871‑5 using a 0.4 mm needle conforming to ISO 7885 butt‑end requirements.
- Leakage test (Annex A): prepare 10 water‑filled cartridges, apply (30 ± 1) N for 1 min, inspect for leakage; record results.
- Ageing & shelf life: seals must maintain performance through the medicinal product’s shelf life; storage guidance referenced in ISO 2230.
- Labelling & designation
- Seals can be labelled “Seal ISO 11040‑3 - A” (or B) when compliant.
Applications and who uses it
ISO 11040-3 is essential for:
- Manufacturers of dental cartridge seals and aluminium caps
- Pharmaceutical and medical device companies producing prefilled dental anaesthetic cartridges
- Quality assurance, validation and regulatory teams responsible for primary packaging compliance
- Test laboratories performing hardness, fragmentation and leakage testing
- Procurement and suppliers specifying compatible seals for dental syringes
Adoption helps ensure product safety, sterility maintenance, and regulatory conformity for dental injectable products.
Related standards
Keywords: ISO 11040-3:2012, prefilled syringes, seals, dental local anaesthetic cartridges, elastomeric seals, leakage test, autoclave, cGMP.
