Petri Dish Brush

A Petri Dish Brush is a hand-guided cleaning brush with a round bristle face that matches the working diameter of reusable laboratory Petri dishes. It is intended for manual washing of glass or reusable plastic dishes between uses, not for disposable polystyrene plates that are discarded after one culture.

During use, the operator holds the handle and moves the brush in circular strokes across the dish base, then into the sidewall and rim. The bristle field should contact the full base without forcing the brush against the dish wall. Because the brush head is round and sized to the dish, one tool replaces improvised sponges, cloths, or bottle brushes that bend and miss the flat base.

The brush does not scrape, cut, or abrade the dish surface. It loosens attached residue so it can be rinsed away. In standard practice, dried or gelled media is usually pre-soaked before brushing; the brush then removes the softened film and any remaining particulate. It is part of a cleaning sequence that includes detergent, rinse, inspection, and, where required, further sterilization.

The standard range covers common reusable dish diameters. All values can be adjusted to your dish size and washing process.

• Reusable glass Petri dishes in microbiology and cell culture labs where agar media, broth, or gelatin residues must be removed between sterilization cycles.
• Dish washing stations in quality control, water testing, food safety, and pharmaceutical laboratories that process large numbers of reusable dishes daily.
• Educational laboratories where students clean glass dishes after culturing, and consistent results depend on residue-free, scratch-free surfaces.
• Dish lids and rims where dried media forms a ring that a flat sponge misses.
• Detergent and rinse film removal from dish bases after machine washing, restoring a clear surface for inspection.

Start by measuring the dish. Measure the internal diameter of the bottom dish (not the lid) in millimeters. Choose a brush head 2–5 mm smaller than the internal diameter so it rotates freely without binding against the sidewall while still covering the base. If you use multiple dish sizes, you may need one brush per size or a mid-range head for overlapping uses.

Match bristle stiffness to the residue. Softer, finer bristles (0.15–0.25 mm) remove light film, dust, and detergent residue with maximum gentleness. Medium bristles (0.25–0.35 mm) handle dried media that has been pre-soaked. Firmer bristles (0.35–0.40 mm) work for more tenacious, partially softened agar or deposits on heavily used dishes. If the residue is baked-on, carbonized, or strongly mineralized, a harsher scrubbing brush or a chemical soak may be more effective than any laboratory dish brush.

Consider the washing environment. If the brush will be used with bleach solutions or acidic cleaners, ask for PBT bristles and a metal-free or chemical-resistant handle. If the brush must survive autoclave cycles, request a heat-rated handle and confirm the exact temperature and frequency. If operators work at a deep sink or with wet gloves, choose a longer handle or an ergonomic grip.

For disposable plastic Petri dishes, a brush is rarely used because the dish is discarded after use. For very small dishes (under 35 mm) or dishes with deep concave bottoms, a custom small-diameter head or a detail brush may be more suitable. For optical-grade dishes where any bristle contact is a concern, consider a lint-free wipe or swab.

Because the brush must fit a specific dish and washing process, we build each order around your laboratory’s needs. Provide the internal dish diameter, dish depth, residue type, wash chemicals, temperature, and handle preference. A sample dish or drawing speeds up the fit confirmation.

• Head diameter — any size from 35 mm to 150 mm, matched to your dish ID
• Bristle material — nylon PA6/6 or PBT, with stiffness controlled by bristle diameter and trim length
• Bristle density — standard, medium, or dense fill for heavier or lighter residues
• Handle — length, straight or ergonomic shape, polypropylene, HDPE, stainless steel, or overmolded grip
• Metal-free construction — no metal staples, ferrules, or core for chemical wash environments
• Color coding — natural, white, blue, or custom colors to separate brushes by dish size, media type, or lab zone
• Marking — molded or printed identification on the handle or ferrule
• Packaging — bulk, individually wrapped, or project-specific packaging

If your project requires material documentation, third-party testing, or inspection support for cleanroom or GMP use, we can assist with those requirements during the customization process.