BOROHOUSE

Borosilicate Glass Airtight Food Storage Containers User

Manual

Ⅰ、Table of Contents Important Safety Warnings

Ⅱ、Step-by-Step Usage Instructions

Ⅲ、 Freezer Storage Guidelines

Ⅳ、Microwave & Oven Heating Operation Specifications

Ⅴ、Cleaning & Long-Term Maintenance

Ⅵ、Troubleshooting & Warranty Instructions

Ⅶ、Product Material Composition Explanation

Figure 1

I. Important Safety Warnings

Figure 1 Prohibited Operations 

• Direct open flame heating
• Induction cooktop heating
• Heating empty containers
• Scraping inner walls with metal utensils
• Unsupervised access by children
• Placing hot glass directly on damp countertops

Glass Container Body (Heat-resistant Borosilicate Glass)

1. Temperature range: -20℃ ~ 510℃; maximum withstandable thermal shock: 120℃. Avoid abrupt extreme temperature shifts, otherwise the glass may shatter.

2. Forbidden heating methods: open flame, direct contact with oven bottom, induction cooktops, charcoal fire and other open heat sources. Only microwave or oven heating is allowed after fully removing the lid.

3. Glass is fragile. Prevent dropping, heavy impact and heavy compression. Keep away from children and infants; do not place within children’s reach.

4. Stop using immediately if glass develops cracks, chips, deep scratches or breakage. Damaged glass may shatter suddenly under temperature change or impact.

5. Do not scrape or tap glass inner walls with metal spoons or hard tools, as permanent scratches will form and weaken glass structural integrity.

6. Do not wipe hot glass with a wet cloth, nor place it directly on damp countertops. Severe thermal shock may cause glass to crack. Handle broken glass carefully to avoid cuts.

7. Fine micro-lines and tiny black spots on glass surfaces are normal production marks and not product defects.

PP Silicone Sealing Lid (Figure 2)

Figure 2

1. Temperature resistance range: -20℃ ~ 120℃. Open the vent valve before microwave heating; fully remove the entire lid before oven baking.

2. The lid cannot achieve absolute airtight sealing. Minor gaps between lid and container caused by dimensional tolerances are normal and not quality defects.

3. Never move the container by holding only the lid after heating. High temperature loosens the lid, and the glass body may slide off, causing scalds from hot liquid. Slight shrinkage of the lid may occur after long-term use.

4. Do not soak the lid in boiling water or bleach. High heat and bleach will age silicone gaskets and deform the lid.

General Safety Risk Reminders

(Figure 3)

1. Risk of liquid bumping & scalding: liquid inside containers may violently bump and splatter hot liquid when taken out of microwave/oven. Keep your face and body away from the container opening when removing.

2. Do not heat empty containers or containers with only a tiny amount of liquid.

3. Foods with shells, peels or membranes (chestnuts, eggplants, whole poultry), and whole raw eggs carry explosion risks when microwaved. Puncture egg yolks before heating; never leave heating unattended.

4. Peel off all stickers and labels on glass and lids before placing in oven or microwave.

5. Container bodies reach extremely high temperatures after heating. Always use heat insulation mats or gloves to carry the full container. Do not place hot containers directly on vinyl tablecloths, plastic or other heat-sensitive surfaces; always use a heat mat underneath.

6. Dispose of discarded products per local municipal waste classification regulations.

II. Step-by-Step Usage Instructions

(Figure 4)

1. First-Time Use

Thoroughly wash the glass container body and lid with neutral detergent and soft sponge before initial use. New silicone gaskets are tight and stiff, leading to slightly stiff snap closure at first — this is normal; sealing will become smoother after repeated opening and closing. Vibration during transportation may dislodge silicone gaskets from grooves, a normal physical occurrence rather than product failure. Reinstall the gasket into the groove following Figure 4 for normal use.

2. Food Storage & Sealing Operations

1. Fully dry the container rim, lid and silicone gasket before sealing to prevent liquid leakage.

2. Open the vent valve to balance internal and external air pressure before opening the lid after hot/cold storage. This avoids lid jamming and damage from pressure differences (See Figure 5).

（Figure 5）

Annotation: ① Lift vent valve to release pressure before opening lid Fasten snaps diagonally to complete airtight sealing ② Release pressure first then open lid; diagonal snap fastening delivers firmer sealing

3. Clean containers promptly after storing strongly colored or pungent foods to prevent permanent pigment staining and residual odors.

III. Freezer Storage Guidelines

（Figure 6）

Annotation: Correct: Reserve 10% expansion gap Wrong: Never fill to full capacity 10% expansion gap Do not fill containers fully before freezing; leave space above liquid and food surfaces

Food expands when frozen, creating pressure on glass that may crack the container. Strictly follow these rules:

1. Reserve a minimum 10% expansion space for all foods before freezing (See Figure 6).

2. Strictly prohibit freezing fully liquid foods: miso soup, broth, clear soup, milk, fruit juice and all beverages.

3. Direct freezing of plain cooked rice and porridge is not recommended due to high water content and large expansion volume.

1. Exception solution: Shape rice into rice balls with gaps and depressions to reserve expansion space before freezing.

4. Curries, meat sauces, tomato paste and thick soups may be frozen, but do not overfill to the point of overflowing the rim.

IV. Microwave & Oven Heating Operation Specifications

1. Open the vent valve before placing in microwave.

2. Fully remove the entire PP silicone lid before oven baking.

3. Wipe all water droplets off glass exterior before heating.

4. Do not heat empty containers or containers with insufficient food/liquid.

5. Carefully read the instruction manual of your personal microwave/oven to match appropriate heating parameters.

6. Do not leave microwave heating unattended; monitor food status throughout to prevent food bursting and soup overflow.

7. After heating, move the full container with a heat insulation mat. Never lift only the lid. Always use a heat mat when placing on countertops (See Figure 7).

（Figure 7 ）

IV. Clening & Long-Term Maintenance

（Figure 8 ）

Annotation: Allowed cleaning tools | Prohibited cleaning methods Soft sponge | Steel wool Abrasive sponge Neutral detergent | Strong acid cleaners Place lids on dishwasher top rack | Soak lids in boiling water Use only soft cleaning tools to avoid scratches and corrosion

Approved Cleaning Practices

1. Glass container body: Dishwasher-safe on top rack (water temperature ≤80℃) or hand wash with soft sponge and mild neutral detergent. Diluted household bleach may be used for heavy stubborn stains; rinse thoroughly with clean water after bleaching.

2. PP glass lid: Dishwasher-safe on top rack (water temperature ≤80℃) or hand wash with neutral detergent recommended.

Strictly Forbidden Cleaning Behaviors

1. Do not use steel wool, abrasive sponges, scouring powder, abrasive cleaners or strong acid cleaners on glass — these will permanently scratch and damage glass surfaces (See Figure 8).

2. Do not soak silicone lids in boiling water or bleach. High heat and bleach deform lids, age silicone gaskets and cause sealing failure.

3. Do not scrub hot glass with cold wet cloths

V. Troubleshooting & Warranty Instructions

VI. Product Material Composition Explanation (FAQs on Plastic Components)

1. Glass container body (pure borosilicate glass, plastic-free).

2. PP plastic lid frame + snap fasteners.

3. Food-grade silicone sealing gasket.

4. Tempered glass top panel (select lid models only).

5. Silicone vent valve (select lid models only).

1. Component Materials & Safety Standards (All BPA-Free)

1. Glass container body: Integrated borosilicate glass construction, 100% plastic-free, BPA-free. Oven-safe, resistant to thermal shock, high and low temperature resistant.

2. Sealing lid assembly (See Figure 12):

①　Lid frame / edge rim: Food-grade polypropylene (PP) plastic, BPA-free, compliant with food contact safety standards.

②　Sealing gasket: Food-grade silicone, BPA-free, phthalate-free, odor-safe.

③　Tempered glass top (select models): Glass surface; outer rim, snap structures are all PP plastic.

2. Plastic-Free Container Sections

The entire interior food-contact surface of the container body is pure glass with no plastic touching food.

3. Reason for Food-Grade Plastic Lids

Plastic material enables tight airtight sealing paired with durable hinge and secure snap design to guarantee fresh-keeping sealing performance and long opening/closing service life. All plastic components of this product adopt BPA-free food-grade plastic to balance functional performance and food safety.

Business Support Contact

BOROHOUSE Customer Care Team

E-mail: contact@borohouse.com 

Tel: +1 302 490 8918

Website: www.borohouse.com