An SCBA (Self-Contained Breathing Apparatus) full face mask that conforms to the EN 136 (1998) standard meets specific safety and performance criteria set by the European Standard for respiratory protective devices. Here's a brief overview of what this standard entails:

EN 136 (1998) Standard Overview:

Scope: This standard specifies the minimum requirements for full face masks used as part of respiratory protective devices, including those for SCBA.

Classification: The standard classifies full face masks into three classes:

• Class 1: Low maintenance and lower durability masks.
• Class 2: General-purpose masks with higher durability and performance.
• Class 3: High-performance masks designed for use in hazardous conditions with maximum durability and resistance.

Materials and Construction:

• Masks must be made from materials that do not have any adverse effects on the wearer.
• The construction should provide a good seal, be robust, and resist aging and damage from exposure to normal environmental conditions.

Performance Requirements:

• Field of Vision: The mask must offer a clear and wide field of vision.
• Resistance to Breathing: It should maintain low breathing resistance.
• Leakage: The mask must minimize leakage to prevent contaminants from entering.
• Mechanical Strength: Must withstand impact, temperature extremes, and other mechanical stresses.
• Compatibility: Should be compatible with other equipment such as helmets, hearing protection, and SCBA units.

Testing:

• Includes tests for visual clarity, resistance to impact, resistance to heat and flame, and overall durability under various conditions.

Marking and Information:

• Masks must be clearly marked with the class, standard (EN 136:1998), and manufacturer information.
• Instructions for use, cleaning, maintenance, and storage must be provided.

This standard ensures that the full face masks used in SCBA systems provide reliable protection and performance in hazardous environments.