Conductive Casters VS Anti-static Casters (1)

In scenarios such as electronic semiconductors, precision instruments, petrochemicals, and dust workshops, static electricity accumulation can cause two types of problems: one is the breakdown of sensitive components by electrostatic discharge (ESD), and the other is the risk of ignition in flammable and explosive environments. Both conductive casters and anti-static casters are used for “charge management”, but the goals and implementation methods are different. Choosing the wrong one can lead to the failure of risk control.
First, let’s give a conclusion: how to choose the right one at a glance?
When it comes to flammable and explosive (solvent, oil and gas, dust explosion risks) or ultra clean/chip level ESD risks, priority should be given to “conductive casters” (which require rapid charge dissipation).
Mainly to reduce electrostatic suction and avoid minor discharge interference (usually in electronic factories and instrument transportation): choose “anti-static casters” (to allow charges to dissipate slowly).
Regardless of which one is chosen: always check if the ‘grounding link’ is complete, otherwise even the best parameters may fail.
1.  Core difference: Different goals → Different resistance ranges → Different release speeds
1) Conductive Caster
Goal: Quickly dissipate the charges generated by the device/human body, avoiding instantaneous discharge after accumulation.
Implementation: By forming a low resistance path between conductive materials and metal structures, charges are introduced into the ground/grounding system.
Typical resistance: The circuit resistance is usually ≤ 10 ⁴ Ω (different standards/measurement methods may vary, please refer to the test report for accuracy).
Release speed: fast (closer to “immediate release”).
2) ESD/Dissipative Caster
Objective: To suppress charge accumulation, control electrostatic potential within a safe range, and reduce micro discharge and dust collection issues.
Implementation: Use dissipative materials/coatings to allow charges to “slowly release” rather than pursuing extremely low resistance.
Typical resistance: mostly in the range of 10 ⁵ -10 ⁹ Ω (commonly in the level of 10 ⁶ -10 ⁸ Ω, still subject to the test report).
Release speed: slow (dissipative type).
2. Materials and Structure: Conductivity requires a “path”, anti-static requires a “controllable resistance”
1). Common methods for conductive casters:
Wheel body: Conductive rubber/conductive PU/metal wheel (rare), usually achieved with low resistance through conductive fillers such as carbon black.
Bracket and connector: Metal brackets are more likely to form a conductive main path, and some will be designed with grounding contacts to ensure contact with the conductive ground.
Key points: The wheels, brackets, equipment, and ground must be connected (contact resistance must not be “off”).
2). Common methods for anti-static casters:
Wheel body: dissipative PU/rubber/PP, etc., stabilizing the resistance in the medium range through anti-static agents or dissipative fillers.
Bracket: Usually no additional conductive design is required, but insulation partitions (such as plastic pads, thick paint films, insulated shaft sleeves, etc.) should still be avoided.
Key point: It’s not that the more conductive the material, the better, but rather that the resistance should be controlled within a range that can discharge without too fast.