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The Class D Fire Extinguisher (7.5kg) is specifically engineered for combating fires involving combustible metals such as magnesium, aluminum, titanium, sodium, lithium, potassium, and zirconium. Unlike standard extinguishers which can react violently with burning metals, this specialized unit uses a unique sodium chloride-based (NaCl) or copper powder formulation that forms a crust over the burning metal, excluding oxygen and absorbing heat.
| Parameter | Specification |
|---|---|
| Working Pressure | 14 bar (203 PSI) |
| Test Pressure | 25 bar (362 PSI) |
| Agent Composition | NaCl (94%) + Thermoplastic polymer (6%) |
| Melting Point of Agent | 80°C (forms cohesive crust) |
| Maximum Metal Temperature | Up to 1600°C (crust remains intact) |
| Certifications | UL 299, ISO 7165, FM Approved |
| Standards | NFPA 10, EN 3-7, AS 2444 |
The sodium chloride agent flows from the extinguisher in a gentle, non-dispersing stream. When it contacts the burning metal surface:
Class D fire extinguishers require specialized training for effective use. We recommend all personnel handling combustible metals complete our Metal Fire Safety Training Course (available separately).
For optimal safety, commercial extinguishers should be inspected monthly and professionally serviced annually as per strict fire safety standards.
Most dry chemical extinguishers last between 10-12 years if maintained correctly, but the propellant and cylinder integrity must be checked regularly.