Ordinary SOT and SMD LED: coated with anti-static black disk (short effect sufficient)
IC products: permanent anti-static discs made of raw materials mixed with carbon black

Principle: Ordinary PS/ABS adhesive discs are sprayed with anti-static liquid on the surface to form a conductive film on the surface
Performance: Short term failure of 3-6 months, coating detachment in friction, collision, high temperature, and dry environments, resistance surge back to insulation; Humidity<40%, anti-static quickly deteriorates, relying on moisture in the air for conductivity