Is over-pressured fire extinguisher can be used safely?

No, an over-pressured fire extinguisher should not be used safely. When a fire extinguisher is over-pressurized, it can pose a risk of bursting or malfunctioning, which may lead to injury or ineffective fire suppression. It's crucial to have extinguishers regularly inspected and maintained to ensure they are within the recommended pressure range. If an extinguisher is found to be over-pressurized, it should be serviced or replaced immediately.