Hazardous Area Static and Dust Control

The task is to remove Combustible Dust/Electrostatically Attracted Particles while controlling surface damage, residue carryover, brush shedding and chemical or temperature degradation.

The work happens in hazardous and explosion-protected area against combustible dust and electrostatically attracted particles.

The part people get wrong: the residue tells you the filament, but the access opening tells you the construction. Get them in that order and the shortlist is short.

5 targets, each with its own opening, residue and contact requirement.

The dimensional envelope those targets impose on the brush:

Select hand, tube, strip, roller, disc or machine-mounted geometry from access and motion.

Three hand brushes bonded to ground, one driven roller on a moving web, one fixed strip at a transfer point. Every one needs a measured bond, not an antistatic label.

In practical brush terms: reach first, then residue. A brush that fits but is too soft can be stiffened; a brush that does not fit is simply the wrong tool.

Conductive nylon or carbon fibre with a measurable path to ground — in an explosion-protected area an ordinary anti-static fill is not enough; the brush has to discharge, not merely resist charging.

The constraints this application puts on the filament:

Start with soft-to-medium fill, an 80°C ceiling and no added medium, and settle the zone classification, resistance value and grounding path before anything else.

Work through it in this order:

1. Identify the target part and measure the access opening or clearance
2. Describe the residue: what it is, how thick it sits, and how strongly it holds
3. Choose the construction that can physically reach that target
4. Set the filament from surface risk, working temperature and cleaning chemistry
5. Fix filament diameter, free trim length and density for the contact pressure you need
6. Run one cycle and check the result before committing to a production quantity

Before you commit to a quantity, send the zone classification, the resistance value required, and the grounding path the brush will connect to.

In a classified zone the primary controls are containment, inerting and grounded extraction, with a brush at best a supporting element. Any brush without a documented resistance and grounding path is an ignition source, and then no brush is the correct answer.

• Ordering a brush before the zone classification, resistance requirement and grounding path are settled
• Changing the filament while leaving excessive engagement, poor alignment or no discharge path unchanged
• Copying a worn brush without first recording its motion, direction, mounting and original working diameter

When a brush is running but not cleaning, start here rather than adding pressure: