Fukuro Malaysia
FREQUENTLY ASKED QUESTION (FAQ)
Glass Container
What does “borosilicate glass” mean?
Borosilicate glass is a heat-resistant type of glass designed to withstand temperature changes better than ordinary glass.
Is cloudy glass a sign of damage?
No. Cloudiness is usually caused by mineral residue from hard water or detergent buildup, not by structural damage to the glass.
Why did my glass container crack after washing?
Glass can crack if it experiences sudden temperature changes. Placing hot glass directly under cold water creates thermal stress that may cause cracking.
Can I put glass containers directly into the microwave/ steamer/ oven from the fridge?
No. Always place the glass container at room temperature for a few minutes before putting it into the microwave, steamer or oven to prevent thermal shock caused by sudden temperature changes.
Can all Fukuro Glass Containers be used safely in the freezer?
Yes, Fukuro Yoki Glass Containers can be used in the oven without the lid. Oven temperatures typically exceed lid heat limits, so the lid must always be removed before oven use.
Glass only (without lid): –30°C to 450°C
Glass with lid: suitable up to 180°C (not recommended for oven use)
⚠️ Always remove the lid before placing the container in the oven and avoid sudden temperature changes to prevent thermal shock.
Is it okay to stack glass containers when storing them?
Yes. However, avoid stacking without lids or protective padding, as direct glass-to-glass contact may cause rim chipping over time.
Can I store fermented foods like kimchi and yogurt in glass containers?
Yes. Glass is ideal for fermented foods because it is non-reactive and does not absorb odors, acids, or flavors.
Are glass containers BPA-free?
Yes, glass itself is naturally BPA-free. This is a major reason health-conscious consumers choose glass.
Can Fukuro Yoki Glass Containers be used in the oven?
Yes, Fukuro Yoki Glass Containers can be used in the oven without the lid. Oven temperatures typically exceed lid heat limits, so the lid must always be removed before oven use.
Glass only (without lid): –30°C to 450°C
Glass with lid: suitable up to 180°C (not recommended for oven use)
⚠️ Always remove the lid before placing the container in the oven and avoid sudden temperature changes to prevent thermal shock.
Can glass containers explode in the microwave?
No, unless the container is sealed airtight. Always remove or vent the lid before microwaving to allow steam to escape safely.
Can glass containers go into the dishwasher daily?
Yes. Glass containers are dishwasher-safe and can be washed daily using normal household cycle such as eco, normal, or glass settings. These settings will not scratch or damage the glass surface.
Glass is highly resistant to scratching. However, avoid abrasive detergents, steel wool, or hard objects knocking against the container during washing to maintain long-term clarity.
Is glass suitable for storing baby food?
Yes, glass is one of the safest options for baby food storage. It is chemical-free and easy to sterilize.
Why does the lid feel hard to open after cooling?
Cooling creates a vacuum seal. All Fukuro Yoki glass container has air vent. You can open the air vent to release the pressure.
Can I use steel wool on glass containers?
No. Steel wool and other abrasive tools can cause micro-scratches on the glass surface, which may affect clarity and long-term durability.
