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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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Closed Cell Silicone Sponge Seal Strip & Gasket / Silicone Foam Seal with Extrusion + Bonding
Yutian manufactures closed cell silicone sponge seal strips and bonded gaskets – fully waterproof, high resilience >95%, low compression set <5%. Extrusion + bonding process – clean joints, ≥10kg tensile, no molds required. Withstands -40°C to +200°C. Custom density, hardness, profiles. Ideal for enclosures, lighting, automotive, and outdoor equipment. Factory direct, wholesale only. Free samples with COA. ISO 9001.
Product Features
• The high temperature resistant silicone sealing strip is an environmentally friendly sealing component, non-toxic and odorless;
• Soft, good elasticity, kink resistance without deformation;
• Strong ozone resistance and insulation performance, the product is not easy to crack in a sealed environment and has a long service life;
• Aging resistance, with higher tear strength and superior electrical performance;
• High and low temperature resistance, can maintain its original high sealing performance between -40° and 200°;
• Silicone high environmental protection grade, non-toxic and tasteless; Materials and products have obtained environmental ROHS (2.0) certification;
Application
| Baby Daily Necessities | State Grid | BS/COM/ESS | Optoelectronics industry |
| mechanical seal | New energy vehicles | Home appliance | Sports equipment |
- Parameters
Product Features
• The high temperature resistant silicone sealing strip is an environmentally friendly sealing component, non-toxic and odorless;
• Soft, good elasticity, kink resistance without deformation;
• Strong ozone resistance and insulation performance, the product is not easy to crack in a sealed environment and has a long service life;
• Aging resistance, with higher tear strength and superior electrical performance;
• High and low temperature resistance, can maintain its original high sealing performance between -40° and 200°;
• Silicone high environmental protection grade, non-toxic and tasteless; Materials and products have obtained environmental ROHS (2.0) certification;
Application
| Baby Daily Necessities | State Grid | BS/COM/ESS | Optoelectronics industry |
| mechanical seal | New energy vehicles | Home appliance | Sports equipment |
Yutian · Factory-direct manufacturer · 20+ years silicone expertise · Three factories one chain
Closed Cell Silicone Sponge Seal Strip & Gasket
High resilience · Waterproof · Lightweight · Extrusion + bonding · Custom profiles
✓ Enclosures & cabinets✓ Lighting & HVAC✓ Automotive & industrial equipment
Fully waterproof – non-absorbentShielding + sealing – one component5+ years outdoor service lifeFree 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 closed-cell foam extrusion and finishing – three integrated factories ensure complete quality control. Not a trader – we control the entire process from raw material to finished seal.
🧪
Guilin Yutian
Silicone raw material · source control
⚙️
Dongguan Huahong
Silicone compounding · foam formulation
🏗️
Dongguan Yutian
Foam extrusion · bonding · finishing
Raw materialCompoundingFoam extrusionBonding & finishing
6,800m² facility14+ extrusion lines90+ production team10+ tons daily capacityISO 9001 certified
Why choose Yutian silicone sponge seals
Closed cell · fully waterproof
Zero water absorption – ideal for outdoor, wet, and high-humidity environments
High resilience >95%
Low compression set<5%– no塌陷 · long-term sealing integrity
Extrusion + bonding
Clean joints · ≥10kg tensile – no molds required · any size
-40°C to +200°C
Wide temperature range – extreme environment ready
5+ years outdoor life
UV & ozone resistant – outperforms EPDM, PVC, PU
Factory direct
Full chain control – no middlemen · consistent quality
Closed cell vs. open cell – why closed cell wins for sealing
| Feature | Closed Cell Silicone Sponge | Open Cell Silicone Sponge |
|---|---|---|
| Water absorption | ✅ None – fully waterproof | ❌ Absorbs water and moisture |
| Sealing effectiveness | ✅ Excellent – complete barrier | ❌ Poor – air and moisture pass through |
| Compression set | ✅<5% – maintains shape | ⚠️ Higher – may deform |
| Dust protection | ✅ Complete barrier | ❌ Particles can enter |
| Outdoor durability | ✅ 5+ years | ⚠️ Limited |
| Best for | Sealing · waterproofing · gaskets | Cushioning · sound absorption |
💡 For sealing applications – door frames, enclosures, outdoor equipment – closed cell silicone sponge is the clear winner.
Key advantages – engineered for sealing performance
🔒
Closed cell structure – fully waterproof & non-absorbent
Zero water penetration · ideal for outdoor & wet environments
Our closed cell silicone sponge seal strip features a non-interconnected cellular structure – each bubble is fully enclosed, with no interconnected passages. Water, moisture, and contaminants cannot penetrate the material, making it ideal for outdoor enclosures, lighting fixtures, HVAC units, and electronic cabinets exposed to rain, humidity, and condensation. Unlike open-cell foams or EPDM sponges that absorb water and degrade over time, our seal remains completely waterproof throughout its service life – no swelling, no deterioration, no loss of sealing performance.
→ Fully waterproof · reliable sealing
🔄
High resilience >95% – low compression set<5%
No塌陷 · long-term sealing integrity
Our silicone sponge seal strip delivers rebound rate >95% and compression set<5%. Even after millions of compression cycles – from repeated door openings, equipment vibration, or thermal expansion – the seal returns to its original shape and maintains its sealing force. This low compression set silicone foam ensures long-term sealing integrity without frequent replacement, significantly reducing maintenance costs.
→ No塌陷 · reduced maintenance
🔗
Extrusion + bonding – clean joints, strong bonds, no molds
≥10kg tensile · no excess adhesive · any size
For silicone sponge gaskets and sealing rings, our extrusion + bonding process eliminates the need for expensive molds. We extrude the profile, cut to length, and bond into a closed ring using automated equipment. The result: clean, professional-looking joints with no visible excess adhesive, and strong bond integrity – each joint is pull-tested to ≥10kg tensile strength. Any diameter – no mold costs – fast turnaround.
→ Clean joints · strong bonds · no molds
🌡️
Wide temperature range – -40°C to +200°C
Extreme environment ready
Our closed cell silicone sponge seal operates reliably from -40°C to +200°C. It remains flexible at low temperatures – no hardening, no cracking – and maintains its shape at high temperatures without softening or degrading. Suitable for extreme environments – from arctic outdoor equipment to high-temperature industrial machinery.
→ Any climate · any environment
☀️
UV & ozone resistant – 5+ years outdoor service life
Outperforms EPDM, PVC, and PU foams
Formulated with advanced UV stabilizers, our silicone sponge seal resists cracking, degradation, and aging from prolonged sun exposure. It also resists ozone – a common cause of rubber degradation in electrical and outdoor equipment. With a 5+ year outdoor service life, it significantly outperforms EPDM, PVC, and polyurethane foams – making it the ideal weatherproof silicone seal for demanding outdoor applications.
→ 5+ years outdoor · weatherproof
📐
Customizable – density, hardness, profile, color
Any spec · any application
We offer full customization: density 0.3–0.8 g/cm³, hardness 15–70 Shore C, profile shapes D, P, rectangular, bulb, or custom, gasket diameter any size (no molds), color any Pantone, and adhesive backing 3M tape or none. OEM/ODM orders welcome – your design, our production.
→ Your spec · our solution
Technical specifications
| Parameter | Standard | Custom |
|---|---|---|
| Material | Closed-cell silicone sponge | |
| Cell structure | Closed cell – non-interconnected pores | |
| Process (gaskets/rings) | Extrusion + bonding – clean joints, ≥10kg tensile | |
| Density | 0.3 – 0.8 g/cm³ | Custom |
| Hardness (Shore C) | 15 – 70 C | 10 – 80 C |
| Rebound rate | ≥95% | — |
| Compression set | <5% | — |
| Temperature range | -40°C to +200°C | Extended |
| Water absorption | None – fully waterproof | |
| UV / Ozone resistance | Excellent – 5+ years | |
| Joint tensile strength (gaskets) | ≥10kg | Higher |
| Tensile strength | ≥0.8 MPa | Custom |
| Elongation at break | ≥200% | — |
| Profile shapes | D / P / Rectangular / Bulb | Any cross-section |
| Gasket form | Strip (coils/cut) / Ring (bonded) | Any diameter |
| Color | Translucent / White / Black | Any Pantone |
| Adhesive backing | None / 3M tape | Custom |
| Certifications | ISO 9001, RoHS, REACH · FDA/LFGB (optional) | |
Silicone sponge vs. EVA vs. PU vs. EPDM – comparison
| Property | Silicone Sponge (Yutian) | EVA Foam | PU Foam | EPDM Foam |
|---|---|---|---|---|
| Rebound rate | ✅ ≥95% | ❌ 60-70% | ❌ 60-70% | ⚠️ 80-85% |
| Compression set | ✅<5% | ❌ High – deforms | ❌ High – deforms | ⚠️ Moderate |
| Temperature range | ✅ -40°C to +200°C | ❌ -10°C to +60°C | ❌ 0°C to +80°C | ⚠️ -20°C to +120°C |
| Water absorption | ✅ None – closed cell | ❌ Absorbs water | ❌ Absorbs water | ⚠️ Low |
| UV / Weather resistance | ✅ 5+ years | ❌ 1-2 years | ❌ 1-2 years | ⚠️ 2-3 years |
| Profile customization | ✅ Flexible extrusion | ❌ Limited | ❌ Limited | ⚠️ Requires molds |
💡 Bottom line: Silicone sponge is the superior choice for sealing applications requiring high resilience, low compression set, wide temperature range, and long-term outdoor durability – particularly in electronics, automotive, and outdoor equipment.
Applications – where closed cell silicone sponge seal excels
📦
Enclosures & cabinets
Electrical cabinets · telecom · server racks · outdoor power
💡
Lighting & HVAC
Outdoor fixtures · LED enclosures · HVAC · solar inverters
🏭
Industrial equipment
Door frames · access panels · machine enclosures
📱
Electronics & appliances
Device housings · appliances · instrumentation
🚗
Automotive & transportation
Vehicle door seals · battery pack covers · EV enclosures
⚡
Vibration damping
Shock absorption · vibration isolation · thermal insulation
Enclosure sealingOutdoor waterproofingVibration dampingAutomotive sealingUV resistant seals
Customization – made to your specification
Density – 0.3-0.8 g/cm³ custom
Hardness – 10-80 Shore C
Profile – D / P / Rectangular / Bulb / Custom
Gasket diameter – any size (no molds)
Color – any Pantone
Adhesive backing – 3M tape / none
Fast sampling – 3-5 days standard / 5-7 custom
Low tooling cost – no mold cost
OEM/ODM – your design, our production
FDA/LFGB – optional food-grade
Case studies – real B2B projects
European electrical cabinet manufacturer – 10,000+ cabinets annually · D-shape seals · >95% rebound ·<5% compression set · -40°C to +200°C · 5+ years · zero sealing failures
US outdoor lighting manufacturer – LED fixture seals · non-absorbent · UV resistant · 5+ years outdoor · zero water ingress · 3+ years partnership
Chinese EV battery pack manufacturer – custom-profile sponge seals · 0.45 g/cm³ · 30 Shore C · vibration absorption · 200,000+ units sealed · zero field failures
Australian industrial equipment manufacturer – 12 custom gasket diameters · extrusion+bonding · clean joints · ≥10kg tensile · 3+ years · zero failures
Certifications & quality – ISO 9001 · RoHS · REACH
ISO 9001
Quality management
CertifiedRoHS / REACH
Environmental compliance
CertifiedFDA / LFGB
Food contact option
Available⭐ National High‑tech Enterprise | 🏭 ISO Class 8 cleanroom | 🏭 20+ years
🎁 Cooperation benefits – for B2B buyers
📦
Free samples
Standard sizes free · Sample with COA · Test before you commit
🎨
Custom development
Sample in 3-5 days · low MOQ · custom density/hardness/profiles
⚡
Fast delivery
Stock 5-7 days · custom 5-7 days · expedite available
Frequently asked questions – for B2B buyers
What is the difference between closed cell and open cell silicone sponge?
Closed cell has non‑interconnected pores – waterproof, non‑absorbent, and provides complete sealing. Open cell has interconnected pores – absorbs water and allows air passage. For sealing applications, closed cell is the superior choice.
What is the rebound rate and compression set?
Rebound rate >95% – returns to original shape after compression. Compression set<5% – no permanent deformation. This ensures long‑term sealing integrity even after millions of compression cycles.
Can you make silicone sponge gaskets and rings?
Yes. We produce silicone sponge gaskets and rings through an extrusion + bonding process. The joint is clean with no excess adhesive and tested to ≥10kg tensile strength. No molds required – any diameter.
What density and hardness should I choose?
Door frame sealing: 0.35‑0.50 g/cm³ (soft). Equipment vibration damping: 0.50‑0.65 g/cm³. Heavy‑duty sealing: 0.65‑0.80 g/cm³ (firm). Hardness: 15‑70 Shore C.
Is it waterproof?
Yes. The closed‑cell structure means no water absorption – water and moisture cannot penetrate. Suitable for outdoor, wet, and high‑humidity environments.
What is the temperature range?
-40°C to +200°C continuously. Remains flexible at low temperatures – no hardening or cracking.
Can you apply adhesive backing?
Yes. We offer 3M tape backing for peel‑and‑stick installation. Also available without backing.
What profile shapes are available?
D‑shape, P‑shape, rectangular, bulb, and custom profiles. Send your drawing – we'll produce the exact profile.
What is the lead time for custom orders?
Samples: 3‑5 days for standard profiles, 5‑7 days for custom. Production: 5‑7 days after sample approval.
Can I get free samples and certification documentation?
Yes. Free samples for qualified buyers, plus COA, ISO 9001 documentation, and RoHS/REACH certificates.
Need closed cell silicone sponge seals for your enclosure, lighting, or automotive application?
High resilience · Waterproof · Extrusion+bonding · Free samples · Custom profiles
🎁 First 10 inquiries → free sample + priority tooling📦 Free sample with COA test report
Request a quote →Dongguan Yutian Silicone Rubber Technology Co., Ltd. | Closed cell silicone sponge seal strip & gasket manufacturer | High resilience · Waterproof · Extrusion+bonding | Custom density · profiles · colors | Factory-direct · Wholesale only · ISO 9001
Tel/Whatsapp: +86 18028921514 | Email: salesmanager@yutiansilicone.com
Tel/Whatsapp: +86 18028921514 | Email: salesmanager@yutiansilicone.com
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INQUIRY
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INQUIRY
Add Successfully
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