Is LocknLock Glass Container dishwasher safe?
Sometimes — the glass body is dishwasher safe, but the plastic lid and silicone gasket should be hand washed to prevent warping and seal degradation.
Quick facts
| Dishwasher safe? | Sometimes — Sometimes — with care |
|---|---|
| Category | Containers |
| Source | AI-reviewed · manufacturer guidance & material science |
| Last checked | 2026-07-28 |
Why
The LocknLock Glass Container body is made of borosilicate or tempered soda-lime glass, which is thermally stable and non-reactive under dishwasher heat (up to ~70°C) and alkaline detergents. However, the lid is typically polypropylene (PP) plastic with a silicone gasket. PP can warp or lose shape over repeated high-heat cycles, and the silicone gasket may degrade, swell, or lose its seal due to prolonged moisture and detergent exposure. The manufacturer recommends top-rack washing for the lid but hand washing for the gasket; the glass body is safe on any rack. Specific failure modes include lid warping (plastic deformation), gasket seal failure (leakage), and possible clouding of the glass if the detergent is too harsh or if the glass is not tempered. Decals or prints on the lid may peel over time.
How do you wash LocknLock Glass Container?
- Disassemble the lid by removing the silicone gasket from its groove.
- Hand wash the silicone gasket with mild dish soap and warm water; rinse thoroughly and air dry.
- Place the glass body on the bottom or middle rack of the dishwasher, away from the heating element.
- Place the plastic lid on the top rack only, ensuring it is secured and not touching the heating element.
- Use a gentle cycle with low heat and avoid the heated dry cycle if possible.
- After the cycle, remove the lid and glass promptly to prevent prolonged steam exposure.
- Reassemble the lid only after all parts are completely dry to prevent mold growth.
What happens if you put LocknLock Glass Container in the dishwasher?
If you put the entire LocknLock Glass Container (including lid and gasket) in the dishwasher, after one wash you may notice the silicone gasket feels slightly softer or looser, but the seal may still hold. After repeated washes (10+ cycles), the lid may begin to warp, especially if placed on the bottom rack near the heating element, causing a poor fit and potential leakage. The gasket can become permanently deformed, losing its ability to create an airtight seal, leading to spills. The glass body itself is durable and unlikely to show damage unless it is a non-tempered type, in which case thermal shock could cause cracking. Over time, the plastic lid may become brittle or develop hairline cracks. The damage is primarily functional (leakage, poor seal) rather than cosmetic, but the lid may also discolor or develop a cloudy appearance.
Frequently asked questions
- Can the glass body go in the microwave?
- Yes, the glass body is microwave-safe as long as it is not subjected to thermal shock (e.g., moving from freezer to microwave). Remove the lid before microwaving.
- Is the container freezer-safe?
- Yes, the glass body and lid are freezer-safe. However, leave some headspace for expansion, and avoid sudden temperature changes.
- How often should I replace the silicone gasket?
- Replace the gasket every 6-12 months or sooner if it becomes loose, cracked, or loses its seal. Hand washing extends its life.
- Can I use the container in the oven?
- No, LocknLock glass containers are not oven-safe unless specifically labeled as such. The plastic lid is not oven-safe.
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Last updated 2026-07-28. General guidance — always check your product’s care label. How we verify · Dishwasher care guides.