How to clean chemistry glassware
Cleaning chemistry glassware turns out to be a complex, sometimes hazardous process involving everything from alkaline base baths and specialized detergents to extreme reagents like hydrofluoric acid and aqua regia. Commenters trade lab war stories, emphasize strict safety practices and waste handling, and contrast elegant chemical solutions with mundane mechanical scrubbing—even for household cookware and bongs. The exchange highlights why lab glassware is reused and meticulously cleaned despite the risks: it’s expensive, often custom-made, and even brand-new pieces can require rigorous decontamination for sensitive experiments.
Extreme Hazards in Glassware Cleaning
- Concentrated hydrofluoric acid (HF) is repeatedly described as a “do not touch” reagent: causes severe burns, long, painful deaths, and can etch glass itself. Several labs refuse to handle legacy bottles; one fatal accident (Australia) is discussed.
- Piranha solution (acidic peroxide) is noted as able to destroy nearly all organics and used for wafers / nanotubes, but considered “piranha-class terrors” and strongly discouraged for things like cookware.
- Aqua regia is described as standard in some labs for deep cleaning, but also terrifyingly corrosive; anecdotes include destroyed clothing and bugs dissolving almost instantly.
Common Lab Cleaning Methods
- Many labs rely on “base baths”: saturated KOH (in water or isopropanol) in large PTFE or plastic containers, with 24–36 hour soaks and careful changeout.
- Additional steps in some workflows: detergent scrub, DI water rinse, acid rinse (e.g., 1N HCl to neutralize basic glass surfaces), then alcohol rinse and drying.
- Specialized detergents (Alconox, Tergazyme, Citranox, Alcojet) are praised for effectiveness when extreme oxidizers are not needed.
Safety, PPE, and Vagueness of Instructions
- Commenters criticize vague phrases like “wear appropriate gloves” and prefer explicit materials (e.g., butyl for strong acids).
- Discussion highlights that different glove materials (nitrile, butyl, etc.) have very different resistance profiles; no single “universal” glove.
- Some argue that vague guidance is partly due to product availability and the need to consult up‑to‑date compatibility charts.
Waste Handling and Environmental Impact
- Labs typically segregate waste (aqueous, organic, ether) in large barrels; reactive baths like KOH are neutralized slowly before disposal.
- Some waste streams are recycled: heavy metals recovered, organics incinerated.
- Detergents with phosphates raise environmental concerns despite being labeled biodegradable.
Cost and Reuse of Glassware
- Multiple comments push back on the idea of single‑use glassware: lab glass is expensive, often hand‑blown, and sometimes custom and backlog‑limited.
- Even new glass often requires thorough cleaning before high‑precision or sensitive work.
Domestic Offshoots and Miscellany
- Long subthread on cleaning burnt cookware: suggestions include oven cleaner, abrasives, electrolysis, high‑heat self‑clean cycles, and milder chemistry—most caution against exotic lab reagents for food-contact items.
- Others mention frustrations with fritted filters, extreme odors from thiols, and the appeal of “oddly satisfying” cleaning videos.
- For consumer glass (e.g., bongs), suggested methods are isopropyl or ethanol with salt as abrasive, orange-oil cleaners, and ultrasonic baths.