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PRODUCTS

Specializing in the production of highquality silicone rubber products

PRODUCT

Specializing in the production of highquality silicone rubber products

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Extruded & Bonded Silicone Sealing Ring for Lunch Boxes / Bento Box Silicone Gasket Ring

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Extruded & Bonded Silicone Sealing Ring for Lunch Boxes / Bento Box Silicone Gasket Ring

Yutian manufactures extruded & bonded silicone sealing rings for lunch boxes and bento boxes. Platinum-cured, food-grade silicone. Extrusion + bonding eliminates expensive molds – clean, strong joints withstand 10kg pull. Leak-proof seal, FDA/LFGB compliant, -50°C to +230°C, dishwasher safe. Custom sizes, low tooling cost. Wholesale only. Free samples.

Product Features

High-quality food-grade silicone
Durable and long-lasting
BPA-free, non-toxic, and odorless
Provides a tight, leak-proof seal
Heat and cold resistant
Easy to clean and dishwasher safe
Fits most standard lunch boxes and containers

Application

Baby Daily Necessities	State Grid	BS/COM/ESS	Optoelectronics industry
mechanical seal	New energy vehicles	Home appliance	Sports equipment

Parameters

Product Features

High-quality food-grade silicone
Durable and long-lasting
BPA-free, non-toxic, and odorless
Provides a tight, leak-proof seal
Heat and cold resistant
Easy to clean and dishwasher safe
Fits most standard lunch boxes and containers

Application

Baby Daily Necessities	State Grid	BS/COM/ESS	Optoelectronics industry
mechanical seal	New energy vehicles	Home appliance	Sports equipment

Product Detail

Extruded & Bonded Silicone Sealing Ring for Food Containers – Food-Grade, Platinum Cured, Strong Clean Joints, Factory Direct Manufacturer | Yutian

Yutian · Factory-direct manufacturer · 18+ years silicone extrusion expertise

Extruded & Bonded Silicone Sealing Ring for Food Containers

Food-grade · Platinum cured · Clean bonded joints · No molds required

✓ Lunch boxes & fresh-keeping containers✓ Extrusion + bonding – no mold costs✓ FDA · LFGB certified

Food-grade siliconePlatinum cured-50°C to +230°C10kg joint strengthFDA · LFGB

No mold investment – try any sizeClean joints – no excess glueCustom sizes, colors, hardnessFree samples with COA

✅ Free samples with COA test report✅ Mass production matches sample – guaranteed✅ 1% daily penalty for delayed delivery✅ Engineer 1-on-1 selection guidance

Three factories · Full industry chain synergy

From silicone compounding to precision extrusion to automated bonding – three integrated factories ensure complete quality control at every stage. Raw material to finished sealing ring – fully in-house.

🧪

Guilin Yutian

Silicone raw material

⚙️

Dongguan Huahong

Compounding & auxiliaries

🏗️

Dongguan Yutian

Extrusion & automated bonding

Raw materialCompoundingExtrusionBonding

6,800m² production facility14+ extrusion lines50+ production team300,000m daily capacityISO 9001 certified

Why Yutian

🏭

Integrated manufacturing

Full control from raw silicone to bonded ring – three factories, one chain. No middlemen.

🔧

Extrusion + bonding process

No molds required – any size, any cross-section. Low tooling cost, fast turnaround.

📜

Global certifications

FDA · LFGB · RoHS · REACH – food contact certified.

⚡

Fast turnaround

3‑5 day sampling · 7‑10 day delivery · low MOQ.

🔬

Automated bonding

Clean, strong joints – no excess glue, no misalignment, 10kg tensile strength.

🌍

Export ready

Full documentation – FDA/LFGB certificates, customs clearance, third‑party test reports.

Key advantages

💰

Extrusion + bonding – no expensive molds required

Try any size at low cost

Unlike molded seals that require metal tooling costing thousands of dollars per size, our extruded silicone sealing ring is produced by extrusion – continuous profile production with no mold cost. This means: no mold investment, fast design changes, low MOQ, and cost-effective custom sizes.

→ No tooling cost · any size · any cross-section

🔗

Clean, strong joints – no excess glue, no weak spots

Automated bonding · 10kg tensile strength

Our bonded silicone gasket ring is produced using automated bonding equipment. Every ring features: no visible excess glue – clean, tidy appearance; even, uniform joint line; strong bond tested to 10kg tensile strength; no misalignment; no weak spots – no risk of early failure.

→ Clean joints · consistent quality

🍽️

Food-grade silicone – FDA & LFGB certified

100% food contact safe

Manufactured from 100% food-grade silicone, our silicone sealing ring for lunch boxes is safe for direct food contact. Platinum curing ensures: no peroxide residues, zero odor, no harmful substances. FDA & LFGB certified – compliant with US and European food contact standards.

→ Safe · certified · export ready

🧴

Platinum cured – no odor, no volatiles

High-purity silicone

Unlike peroxide-cured silicone that can leave residues and odor, our rings are platinum cured – the same high-purity process used in medical-grade products. Zero peroxide residues, no taste, no smell. Superior purity – safe for sensitive food contact.

→ Pure · odorless · tasteless

🌡️

Wide temperature range – -50°C to +230°C

Freezer · microwave · dishwasher safe

Our food-grade silicone seal performs reliably across a -50°C to +230°C temperature range. Suitable for freezer storage (remains flexible), microwave heating, dishwasher cleaning, and boiling sterilization – no degradation.

→ All-in-one · freezer to microwave

🔒

Excellent sealing performance – no leaks

Multiple cross-section options

Available in D-shape, O-ring, rectangular, bulb, P-shape, and custom profiles – each designed for specific sealing requirements. The silicone material's high elasticity ensures consistent sealing pressure – even with repeated opening and closing. Long-term resilience – no permanent deformation. Keeps food fresh and prevents spills.

→ Leak-proof · fresh longer

🎨

Customizable – size, color, hardness, cross-section

Tailored to your container

Our custom silicone sealing ring can be tailored to your exact requirements: any ring diameter, any length; any cross-section profile – D-shape, O-ring, rectangular, bulb, P-shape, or custom; hardness 30-70 Shore A; any color, custom-matched. OEM/ODM orders welcome.

→ Your spec · our solution

🏭

Factory direct – wholesale only, no retail

Competitive pricing · OEM/ODM support

As a factory-direct silicone seal manufacturer, we offer competitive wholesale pricing without retail markups. Wholesale only – we do not sell retail. Full OEM/ODM support.

→ Best value · direct from source

Clean joint vs. poor joint – what to look for

Not all bonded joints are created equal. Here's the difference between a quality joint and a poor one.

Feature	Clean Joint (Yutian)	Poor Joint
Excess glue / overflow	✅ None – tidy finish	❌ Visible excess glue squeezed out
Joint line	✅ Even, uniform	❌ Uneven or messy
Surface finish	✅ Smooth to the touch	❌ Raised or rough
Alignment	✅ Perfectly matched ends	❌ Misaligned – not flush
Bond strength	✅ Strong – 10kg tensile	❌ Weak – easy to separate

💡 Our automated bonding equipment ensures every joint meets the 'clean joint' standard – no excess glue, no misalignment, just a tidy, reliable seal.

Technical specifications & custom range

Parameter	Standard	Custom
Material	100% food-grade silicone (platinum cured)
Cross-section	D-shape / O-ring / Rectangular	Bulb / P-shape / Custom profile
Hardness (Shore A)	50±5 A	30 – 70 A
Temperature range	-50°C to +230°C	Extended
Tensile strength	≥7.0 MPa	—
Elongation at break	≥500%	—
Tear strength	≥20 kN/m	—
Joint strength	≥10kg tensile	—
Dimensional tolerance	±0.1mm	Tighter
Color	Translucent / White	Any Pantone color
Certifications	FDA, LFGB, RoHS, REACH
Process	Extrusion + automated bonding

Silicone vs. PVC vs. EPDM – food container seals comparison

Property	Silicone (Yutian)	PVC	EPDM
Food-grade certified	✅ FDA/LFGB	❌ Non-food-grade	❌ Non-food-grade
Platinum cured	✅ No peroxide residues	❌ Contains plasticizers	❌ Not applicable
Odor	✅ None	❌ Strong plastic odor	⚠️ Rubber odor
Temperature range	✅ -50°C to +230°C	⚠️ -10°C to +60°C	⚠️ -20°C to +120°C
Resilience (rebound)	✅ ≥95%	❌ Poor – permanent deformation	⚠️ 80-85%
Lifespan	✅ 5+ years	❌ 1-2 years	⚠️ 2-3 years
Microwave/dishwasher safe	✅ Yes	❌ No	❌ No

💡 Bottom line: Food containers need food-grade silicone. PVC and EPDM are not certified for food contact and can leach harmful substances. Silicone is the only safe, durable choice.

Extrusion+bonding vs. molding – which process wins?

Feature	Extrusion + Bonding (Yutian)	Molding
Tooling cost	✅ None – no molds required	❌ High – expensive tooling per size
Size flexibility	✅ Any size – no limits	❌ Limited – each size needs a mold
Cross-section options	✅ Any profile – quick die change	❌ Fixed – each profile needs a mold
Lead time for new sizes	✅ Fast – days, not weeks	❌ Slow – weeks to months
Dimensional precision	✅ ±0.1mm	⚠️ ±0.3mm
Joint appearance	✅ Clean – no excess glue	✅ No joint (molded as one piece)
Cost for small batches	✅ Low – no tooling cost	❌ High – mold cost amortization

💡 Bottom line: Extrusion+bonding is the smarter choice for custom sizes, non-standard dimensions, and fast product development. No expensive molds, fast lead times, clean joints.

Applications

🍱

Lunch boxes

Bento, meal prep containers

🥗

Fresh-keeping containers

Food storage, leftovers

🧊

Freezer storage

Frozen food containers

🍳

Cookware

Pot lids, rice cookers

🏪

Commercial food service

Bulk storage, deli

⚙️

OEM

Custom container projects

Lunch box sealsFresh-keeping container sealsFood storage gasketsMicrowave-safe sealsDishwasher-safe gasketsFDA silicone seals

Made to your specification

Cross-section – D-shape / O-ring / Rectangular / Bulb / P-shape / Custom

Ring diameter – any size, any container

Hardness – 30-70 Shore A

Color – any Pantone color

Custom packaging & branding

No molds required – low setup cost

Case studies – real projects

European food container brand – 12 different sizes of custom-profile sealing rings · no molds required · samples in 5 days · 200,000+ rings annually · clean joints · consistent quality

Chinese fresh-keeping container manufacturer – switched to Yutian bonded silicone rings · custom D-shape seal provides superior leak protection · platinum-cured silicone ensures no odor transfer to food

US kitchenware brand – custom-color silicone seals for vacuum food storage · color matching precise · automated bonding delivered clean joints – met brand quality standards

Australian food service supplier – bulk food storage containers · -50°C to +230°C range handles freezer and dishwasher · no degradation · no leaks

Certifications & quality

🇺🇸

FDA

Food contact certified

21 CFR 177.2600

🇪🇺

LFGB

German food contact

Certified

🌱

RoHS / REACH

Compliant

Certified

⭐ National High‑tech Enterprise | 🏭 Class 8 cleanroom | 🏭 18+ years

🎁 Cooperation benefits

📦

Free samples

Standard sizes free
Sample with COA test report

🎨

Custom development

Sample in 3‑5 days
Low MOQ for trials

⚡

Fast delivery

Stock 5‑7 days
Custom 7‑10 days

Customer feedback

“We've been using Yutian's extruded & bonded silicone sealing rings for our premium lunch box line for over two years. The clean joints with no excess glue meet our brand quality standards. The extrusion+bonding process allowed us to test 12 different sizes without expensive mold costs. Reliable product, reliable supplier.”

— Product Manager, European Food Container Brand

“We switched to Yutian's silicone seals for our fresh-keeping containers. The custom D-shape seal provides better leak protection than our previous O-rings. Platinum-cured silicone means no odor – our customers noticed the difference. Highly recommended.”

— Procurement Manager, Chinese Container Manufacturer

Frequently asked questions

What is an extruded & bonded silicone sealing ring?

A sealing ring produced by extruding a continuous silicone profile, cutting it to length, and bonding the ends together using automated equipment. The process eliminates expensive molds and allows for custom sizes.

Is the joint clean? Is there excess glue?

The joint is clean and tidy – no excess glue, no misalignment, no gaps. Our automated bonding equipment delivers consistent, clean joints with even joint lines and strong bonds (10kg tensile strength).

Is the silicone food-grade?

Yes – 100% food-grade silicone, platinum cured, FDA and LFGB certified. Safe for direct food contact.

What temperature range can it handle?

-50°C to +230°C – suitable for freezer storage, microwave heating, dishwasher cleaning, and boiling sterilization.

Does it have any odor or taste?

No. Platinum curing leaves no peroxide residues – zero odor, zero taste transfer. Safe for sensitive food applications.

What cross-section profiles are available?

D-shape, O-ring, rectangular, bulb, P-shape, and custom profiles. We can match your drawing – any profile you need.

Can you make custom sizes?

Absolutely. Any ring diameter, any length. No molds required – extrusion allows for any custom size.

What is the lead time for custom orders?

Samples: 3-5 days. Mass production: 7-10 days after sample approval.

Are there tooling costs?

No molds are required for extrusion. There is a small setup fee, but no expensive mold cost. This makes custom sizes economical even for small quantities.

Can I get a free sample?

Yes – standard sizes free for qualified wholesale buyers. Contact us to request a sample for testing.

Need custom extruded & bonded silicone sealing rings for your food containers?

Factory-direct · Wholesale only · Free samples · OEM/ODM welcome

🎁 First 10 inquiries → free sample + priority tooling📦 Free sample with COA test report

Request a quote →

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