Is Glasslock 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, seal degradation, and premature failure.
Quick facts
| Dishwasher safe? | Sometimes — Sometimes — with care |
|---|---|
| Category | Containers |
| Source | AI-reviewed · manufacturer guidance & material science |
| Last checked | 2026-07-28 |
Why
The Glasslock container body is made of tempered soda-lime glass, which is thermally stable and non-porous, making it dishwasher safe under normal heat cycles. However, the lid is typically made of polypropylene (PP) plastic, which can warp or deform under prolonged high heat (e.g., heated drying cycles). The silicone gasket seals the lid; repeated dishwasher exposure can cause the silicone to degrade, lose elasticity, and eventually leak. The manufacturer explicitly states that lids and gaskets are not dishwasher safe and should be hand washed. Machine washing the lid may also cause the plastic to become brittle over time, leading to cracks. The glass body itself is safe and will not cloud or etch because glass is resistant to alkaline detergents. The primary failure modes are lid warping, gasket seal failure, and potential cracking of the lid plastic.
How do you wash Glasslock Glass Container?
- Remove the lid and separate the silicone gasket from the lid.
- Hand wash the lid and gasket in warm water with mild dish soap using a soft sponge.
- Rinse thoroughly and air dry completely before reassembling.
- Wash the glass body in the dishwasher on the top rack, away from the heating element.
- Use a gentle cycle with low heat drying or air dry to minimize thermal stress.
- Avoid abrasive scrubbers on the glass to prevent scratches.
- Reassemble the lid and gasket only when both are completely dry.
What happens if you put Glasslock Glass Container in the dishwasher?
If you put the entire Glasslock container (including lid and gasket) in the dishwasher, after one wash you may notice the lid feels slightly softer or warped, and the gasket may not fit as snugly. After repeated washes, the lid can become permanently deformed, causing it to not seal properly, leading to leaks. The silicone gasket may harden, crack, or lose its shape, compromising the airtight seal. The glass body will remain unaffected. The damage is functional: the container will no longer be leak-proof, and the lid may become difficult to close or may break. Cosmetic issues like clouding or etching do not occur on the glass. The plastic lid may also discolor over time.
Frequently asked questions
- Can the glass body go in the microwave?
- Yes, the tempered glass body is microwave-safe without the lid. Remove the plastic lid before microwaving to avoid warping.
- What is the maximum temperature the glass can withstand?
- The tempered glass can typically withstand temperatures up to 400°F (204°C), but avoid sudden temperature changes (e.g., from freezer to oven) to prevent thermal shock.
- How often should I replace the silicone gasket?
- Replace the gasket every 6-12 months or sooner if it becomes loose, cracked, or no longer seals tightly. Hand washing extends its life.
- Can the lid be used in the freezer?
- Yes, the plastic lid is freezer-safe, but ensure the container is not overfilled to allow for expansion. The gasket may become stiff in extreme cold.
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Last updated 2026-07-28. General guidance — always check your product’s care label. How we verify · Dishwasher care guides.