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Thermos FUNtainer F310 food-jar care in six steps

For Thermos FUNtainer F310-family food jars, clean the lid and removable gasket separately, then dry them completely. Learn the top-rack dishwasher rule and precautions against burns.

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Wikimedia Commons · Robert Orzanna / Wikimedia Commons — CC BY-SA 4.0 · CC BY-SA 4.0 ↗

This guide applies the Thermos F310/F410/F411 care guide specifically to the F310 food-jar portion. Models vary, so follow the manual for your exact product. The manufacturer advises not keeping contents longer than 24 hours and cleaning promptly after each use.

Your try-it-at-home checklist

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1. Empty remaining food as soon as possible; do not leave contents for over 24 hours. Dairy and soup may spoil sooner, so never taste food you suspect has spoiled.
2. After the jar and lid have cooled, twist the lid counterclockwise. Hot contents can scald, so children need adult supervision.
3. Following the manual, remove the O-ring gasket from the underside of the lid and any included spoon. Ask the manufacturer about replacements if the seal is loose or torn.
4. Wash each part separately in warm soapy water and rinse thoroughly. Avoid abrasive scrubbers and chlorine-containing bleach or cleaners.
5. The F310-family guide permits the top dishwasher rack, but recommends handwashing for cleaner gasket crevices and to protect the finish. Never generalize this approval to other models.
6. Let all parts dry completely, then fit the gasket with its flat side facing the lid. Check for correct seating and leakage and leave room for the lid when filling.

Thermos Brand10oz FUNtainer Kids Insulated Food Jar ↗Official manufacturer F3101SK6 product page confirms F310-family 10oz wide mouth food jar and top-rack dishwasher allowance.Thermos BrandCare and Use Guide FUNtainer Food Jar and Water Bottle (F310, F410, F411) ↗Manufacturer PDF original checked including rendered page 1: warm soapy washing, separate gasket, handwash preferred, dry fully, no abrasives/bleach; hot food supervision and spoilage warning.Wikimedia CommonsFile:Thermos flask with hot water.jpg ↗Photo copyright holder Robert Orzanna / Orschiro, CC BY-SA 4.0 on file page, HTTPS image opened; only a generic flask reference.Wikimedia CommonsCommons: Reusing content outside Wikimedia - technical ↗Direct image hotlinking explicitly permitted, conditions of each file license still apply.

Your try-it-at-home checklist

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