Is Zak Designs cup dishwasher safe?
Sometimes — the Tritan body is top-rack safe, but the lid and silicone gasket should be hand washed.
Quick facts
| Dishwasher safe? | Sometimes — Sometimes — with care |
|---|---|
| Category | Baby |
| Source | AI-reviewed · manufacturer guidance & material science |
| Last checked | 2026-07-28 |
Why
Zak Designs cups are typically made from Tritan copolyester, a BPA-free plastic that is dishwasher safe on the top rack (away from the heating element) because it resists warping and clouding under moderate heat. However, the lid often contains a silicone gasket and a polypropylene spout or straw; silicone can degrade over time from high heat and alkaline detergent, leading to loss of seal or discoloration, while polypropylene may warp or crack. The manufacturer recommends hand washing lids and gaskets to preserve the leak-proof seal. Repeated dishwasher use can cause the silicone to become brittle and the lid's snap-fit to loosen, resulting in leaks. The cup body itself is durable and typically survives machine washing without issue, though decals or prints may peel after many cycles. For best longevity, hand wash all components with mild soap and warm water.
How do you wash Zak Designs cup?
- Disassemble the cup: remove the lid, straw, and silicone gasket.
- Rinse all parts immediately after use to prevent residue buildup.
- Hand wash the lid, gasket, and straw in warm soapy water using a soft sponge.
- For the cup body, either hand wash or place on the top rack of the dishwasher (avoid bottom rack near heating element).
- Use a bottle brush to clean the straw interior thoroughly.
- Air dry all components completely before reassembling to prevent mold.
- Reassemble only when parts are fully dry.
What happens if you put Zak Designs cup in the dishwasher?
If you put the entire Zak Designs cup in the dishwasher, after one wash you may notice slight clouding on the lid or a looser fit of the gasket. After repeated washes (10+ cycles), the silicone gasket can become stiff and cracked, leading to leaks when the cup is tipped. The lid's plastic may warp, causing difficulty in snapping it on or off. The cup body (Tritan) typically remains clear and intact, but any printed designs may start to fade or peel. The straw, if plastic, can become cloudy or develop cracks. These changes are primarily cosmetic for the body but functional for the lid and seal, potentially rendering the cup non-leak-proof. Over time, the risk of bacterial growth in micro-cracks increases. Hand washing preserves the cup's integrity and extends its usable life significantly.
Frequently asked questions
- Can the Zak Designs cup be used for hot liquids?
- No, Tritan copolyester is not designed for hot liquids; it can warp or leach chemicals above 100°C (212°F). Use only for cold or room-temperature beverages.
- Is the cup microwave safe?
- No, the cup body and lid are not microwave safe. The plastic and silicone can melt or degrade in the microwave.
- How often should I replace the silicone gasket?
- Replace the gasket every 3-6 months or sooner if you notice cracks, stiffness, or leaks. Hand washing extends its life.
- Can I freeze the cup?
- Freezing is not recommended as liquid expansion can crack the cup or lid. If you must freeze, leave ample headspace and use a freezer-safe container.
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Last updated 2026-07-28. General guidance — always check your product’s care label. How we verify · Dishwasher care guides.