Is Plastic measuring cup dishwasher safe?
Sometimes — the plastic body is top-rack safe if made from polypropylene (PP) or Tritan, but the printed measurement markings may peel or fade over time, and any silicone gasket should be hand washed.
Quick facts
| Dishwasher safe? | Sometimes — Sometimes — with care |
|---|---|
| Category | Bakeware |
| Source | AI-reviewed · manufacturer guidance & material science |
| Last checked | 2026-07-28 |
Why
Most plastic measuring cups are made from polypropylene (PP) or Tritan copolyester. PP can withstand up to 120°C (248°F) but prolonged exposure to high heat and alkaline dishwasher detergent can cause warping or stress cracking. Tritan is more heat-resistant but still susceptible to detergent-induced crazing. The printed measurement markings (often ink or decal) are the weakest point: dishwasher heat and moisture cause them to peel, fade, or bubble. The manufacturer (e.g., OXO, Pyrex) typically recommends top-rack washing for the cup but hand washing for any silicone gasket or lid. Repeated machine washing may also cause the plastic to become cloudy or develop a white film (etching) from detergent residue. The handle is generally safe, but if it has a rubberized grip, that material may degrade and become sticky.
How do you wash Plastic measuring cup?
- Rinse immediately after use to prevent residue from drying.
- Hand wash with mild dish soap and a soft sponge, focusing on the inside and measurement markings.
- If using a dishwasher, place the cup on the top rack only, away from the heating element.
- Use a low-temperature, no-heat-dry cycle to minimize thermal stress.
- Remove promptly after cycle ends and air dry completely before storing.
- For cups with silicone gaskets or lids, hand wash those parts separately.
- Avoid abrasive scrubbers or bleach-based detergents that can damage the plastic surface.
What happens if you put Plastic measuring cup in the dishwasher?
After one dishwasher cycle, you may notice the measurement markings appear slightly faded or have tiny bubbles under the print. The plastic body itself will likely look fine. After repeated washes (10+ cycles), the markings will progressively peel or wear away, making the cup less useful for precise measuring. The plastic may develop a cloudy or hazy appearance (etching) from the alkaline detergent, and the cup could warp slightly if exposed to high heat near the heating element. Warping can cause the cup to sit unevenly or the handle to become loose. These changes are primarily cosmetic and functional (loss of markings), but the cup remains usable for approximate measures. If the cup has a silicone gasket, it may become brittle or cracked after repeated washes, leading to leaks.
Frequently asked questions
- Can I use a plastic measuring cup for hot liquids?
- Most polypropylene (PP) cups are safe for hot liquids up to about 120°C (248°F), but avoid boiling water as it may cause warping. Tritan cups can handle higher temperatures, but always check the manufacturer's guidelines.
- Will the plastic leach chemicals if washed in the dishwasher?
- PP and Tritan are generally BPA-free and stable under normal dishwasher conditions. However, high heat and harsh detergents can accelerate degradation, potentially releasing microplastics over time. Hand washing is safer for longevity.
- How often should I replace a plastic measuring cup?
- Replace it when the measurement markings become illegible, the cup warps, or it develops cracks or a persistent cloudy film. Typically every 1-2 years with regular use.
- Can I microwave a plastic measuring cup?
- Only if it is labeled microwave-safe. PP cups are usually microwave-safe for short periods, but Tritan may not be. Always check the bottom of the cup for a microwave-safe symbol.
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Last updated 2026-07-28. General guidance — always check your product’s care label. How we verify · Dishwasher care guides.