In science, a spatula is a handheld tool used to transfer, scoop, and distribute solid chemicals and samples. Its most common job is moving dry powders and granular materials onto a balance for weighing, where it lets you add tiny amounts at a time for precise measurements. But spatulas show up across chemistry, biology, medicine, and pharmaceutical quality control, each field relying on slightly different designs for specific tasks.
Core Uses in Chemistry Labs
The everyday workhorse task for a lab spatula is transporting dry chemical compounds from their storage containers to a weighing vessel on a balance. Because spatulas have thin, flat or slightly curved ends, you can scoop up very small quantities of a powder and tap them out gradually. This matters when you need, say, exactly 0.25 grams of a reagent and overshooting by even a fraction would throw off your experiment.
Beyond weighing, spatulas are used to mix small amounts of solids, scrape residue from the walls of beakers or flasks, and dislodge material that has caked inside a container. If you’ve ever tried to pour a fine powder directly from one vessel to another, you know how easy it is to lose control. A spatula gives you that precision.
Types of Lab Spatulas
Not all spatulas look the same. The type you reach for depends on the size of the sample and the container you’re working with.
- Microspatulas: Thin tools with pointed ends, designed to transfer materials into small test tubes, microcentrifuge tubes, or microplates. These are the go-to for tiny quantities.
- Double-ended spatulas: Feature two different working ends, often one flat and one bent, or one rounded and one tapered. This gives you flexibility without switching tools.
- Spatula-scoops: One end is a flat spatula blade, the other is a small spoon or scoop. Useful when you need to both scrape and transfer material in the same step.
- Trough-shaped spatulas: Have a curved, channel-like profile with one rounded and one pointed end, good for loosening compacted material inside containers.
Most reusable lab spatulas are made from stainless steel, which resists heat, cold, acids, bases, and common solvents. Some are coated in PTFE (the same nonstick material found on cookware), which adds chemical resistance and prevents sticky samples from clinging to the surface. Disposable plastic or paper spatulas also exist for situations where cross-contamination between samples is a concern, since even thorough cleaning of a reusable spatula can leave traces behind.
Uses in Biology and Medicine
Spatulas aren’t limited to chemistry benches. In microbiology, they help spread bacterial cultures across agar plates or scrape colonies for transfer. In cell biology, specialized flat spatulas called cell scrapers detach adherent cells from the bottom of culture dishes.
Medicine has its own versions. In cervical screening (Pap tests), specially shaped plastic spatulas collect cell samples from the cervix. One design, the Szalay spatula, has an elongated narrow tip that reaches further into the cervical canal. Studies published in the Journal of Cytology found that this long-tipped design produced a higher proportion of satisfactory cell samples and caused significantly less contact bleeding compared to the traditional shorter-tipped Ayre spatula.
Pharmaceutical and Industrial Sampling
In pharmaceutical manufacturing, spatulas and scoops are standard tools for quality control sampling. When inspectors need to test a batch of powdered or granular product, they use a spatula to collect small portions from containers. Those portions are then blended together to create a representative sample of the whole batch. The World Health Organization includes spatulas in its official guidelines for sampling pharmaceutical products, specifying them for powdered and granular solids alongside scoops for larger volumes. V-shaped spatulas with pointed ends are also used to pierce packaging and collect samples from sealed products during pre-production or post-production testing.
Cleaning and Sterilization
A dirty spatula can ruin an experiment or contaminate a sample. The standard practice is to clean a spatula thoroughly between every use, especially when switching between different chemicals. In sterile laboratory environments, stainless steel spatulas are autoclaved, a process that uses pressurized steam to kill all microorganisms. UC San Diego’s biosafety protocols list spatulas among the items suitable for a basic gravity autoclave cycle alongside glassware and stir bars.
For situations where full sterilization isn’t practical between steps, wiping the spatula tip with 70% ethanol is effective. Research on decontamination techniques found that four to five firm wipes with an ethanol-soaked gauze eliminated tested microorganisms from spatula tips. This quick friction method is commonly used in clinical and dental settings where the same spatula contacts material repeatedly during a procedure. When even that level of risk is too high, disposable single-use spatulas eliminate the problem entirely.