SIST EN 148-2:1999

Overview

EN 148-2:1999 is a CEN (European Committee for Standardization) standard that specifies requirements for centre thread connections used on facepieces of respiratory protective devices. The standard covers the design intent and applicability for threaded facepiece fittings, ensuring safe, reliable mechanical and sealing interfaces between masks and filters or breathing hoses. It explicitly excludes diving equipment and positive pressure demand breathing apparatus.

Key Topics

The standard addresses essential technical topics for centre thread connections without prescribing specific proprietary designs. Topics typically covered include:

• Thread geometry and form: standardized thread profiles and mating interfaces to ensure interchangeability between compatible facepieces and accessories.
• Mechanical performance: strength, durability and resistance to wear under normal use conditions.
• Sealing and leakage control: requirements to maintain airtight connections between facepiece and attached components.
• Materials and corrosion resistance: suitable material properties for threads and threaded fittings to maintain performance and safety.
• Dimensional tolerances and fit: tolerancing rules to ensure consistent mating across different manufacturers.
• Marking and documentation: identification of compliant components and relevant information for users and procurement.
• Testing and conformity: test methods to verify compliance with mechanical, sealing and dimensional requirements.

Note: EN 148-2 sets the framework and performance expectations for centre thread connections; it does not list numeric thread sizes or operational limits in this summary.

Applications

EN 148-2 is practical for organizations and roles involved in the design, manufacture, testing, procurement and use of respiratory protective equipment:

• PPE manufacturers and designers: to design facepieces and connectors that are compatible and conformant with European requirements.
• Test laboratories and certification bodies: to assess thread connections for compliance and safety approvals.
• Occupational health and safety professionals: to specify compatible respiratory equipment for workplaces.
• Procurement teams: to ensure purchased respirators and filters are interoperable and meet recognized standards.
• Maintenance and repair: guidance for replacement parts and ensuring continued compatibility.

Related Standards

EN 148-2 is part of the EN 148 series addressing threads for facepieces. For complete system compliance, users should consult the broader EN 148 series and other respiratory protective device standards (e.g., standards covering complete facepieces, filters, and performance testing).

Keywords: EN 148-2, respiratory protective devices, centre thread connection, facepiece threads, CEN standard, PPE, thread interchangeability, respiratory connector standard.