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Silicone Sponge Seals — Lightweight, Waterproof, High Compression Sealing for Demanding Applications
Yutian is a vertically integrated manufacturer with three specialized factories spanning silicone raw materials, compounding, and precision foam extrusion. By owning the entire production chain — from material formulation to finished seals — we deliver closed cell silicone sponge sealing solutions with consistent quality, batch-to-batch traceability, and full regulatory compliance. With 20+ years of silicone expertise, 6,800m² of production floor space, and 14+ extrusion lines, we have the scale and capability to support projects from rapid prototyping to high-volume production.
Our silicone sponge seals feature a closed cell structure — water, moisture, and contaminants cannot penetrate, making them fully waterproof and ideal for outdoor, wet, and high-humidity environments. With density as low as 0.3 g/cm³ and compressibility exceeding 50%, they adapt to uneven surfaces and provide superior sealing performance. The material delivers ≥95% rebound and <5% compression set — ensuring long-term sealing integrity even after millions of compression cycles. Operating reliably across -40°C to +200°C, with 5+ years of outdoor service life and excellent UV/ozone resistance. UL94 V-0 flame retardant and FDA/LFGB food-contact grades are available upon request.
Our extrusion + bonding process eliminates expensive molds — producing any profile, any cross-section, any size, with clean bonded joints (≥10kg tensile strength). Available in continuous strips (coils or cut-to-length) or bonded rings (gaskets). We offer full customization — density (0.3–0.8 g/cm³), hardness (10–80 Shore C), profile shape, color, and adhesive backing. From enclosure seals and LED gaskets to drone vibration damping and high-temperature industrial applications — we deliver exactly what your application demands.
↓ Explore our silicone sponge sealing series below — lightweight, waterproof sealing for demanding applications.
Silicone seal for lawn mower
Yutian’s silicone lawn mower seals provide reliable weatherproofing for outdoor power equipment. Engineered to resist oil, UV rays, and extreme temperatures (-40°C to 150°C). IP68-rated to prevent dust/moisture ingress. Compatible with major mower brands. ISO 9001 certified.
Flame retardant foam sealing strip
Our flame retardant foam silicone sealing strips are designed for a wide range of applications including construction, automotive, and industrial uses. These sealing strips not only provide excellent fire resistance but also ensure effective sealing against air, water, and dust. Made from high-quality silicone, they are durable and reliable, making them an ideal choice for enhancing safety and performance in various environments.
Square silicone sealing ring
Our Square Silicone Sealing Ring delivers exceptional sealing performance for various applications. Designed to handle high temperatures and resist chemicals, it’s perfect for automotive engines, industrial machinery, and electronics. Its durable and flexible nature ensures reliable sealing in critical environments, making it a versatile choice for preventing leaks and maintaining efficiency.
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.
Foam silicone sealing strip for doors and Windows
Transform your doors and windows with our superior foam silicone strip. Engineered for superior sealing and insulation, it keeps out drafts, reduces noise, and promotes energy efficiency. Ideal for home improvement projects, it ensures long-lasting weatherproofing and a more comfortable living space.
Silicone foam anti-collision strip
Upgrade your home's safety with our innovative foam anti-collision silicone strip. Designed to protect furniture and appliances from accidental damage, its shock-absorbing capabilities ensure long-lasting durability and peace of mind. Perfect for child-friendly spaces, it adds an extra layer of safety to your everyday living.
Physical Properties — Silicone Sponge Sealing Strips & Gaskets
| Parameter | Standard Range | Custom Range |
|---|---|---|
| Material | Silicone sponge | |
| Curing / Foaming process | Platinum-cured foaming | |
| Density | 0.3 – 0.8 g/cm³ | 0.2 – 0.8 g/cm³ |
| Hardness (Shore C) | 15 – 70 C | 10 – 80 C |
| Compressibility | 50% – 75% | |
| Compression set | <5% | |
| Rebound rate | ≥95% | |
| Temperature range (standard) | -40°C to +200°C | Extended |
| Temperature range (high-temp) | — | Up to +250°C |
| Flame retardancy | — | UL94 V-0 (optional) |
| Water absorption | None — fully waterproof | |
| UV / Ozone resistance | Excellent — 5+ years outdoor | |
| Joint tensile strength (gaskets) | ≥10kg | |
| Tensile strength | ≥0.8 MPa | |
| Elongation at break | ≥200% | |
| Profile shapes | D / P / Rectangular / Bulb / Custom | |
| Form | Strip (coils / cut‑to‑length) / Ring (bonded) | |
| Color | Translucent / White / Black / Any Pantone | |
| Adhesive backing | None / 3M tape | |
| Certifications | ISO 9001, RoHS, REACH · FDA / LFGB (optional) | |
Why Choose Yutian — Your Silicone Sponge Sealing Partner
Vertically integrated · Platinum-cured foaming · 20+ years expertise · 14+ extrusion lines · ISO 9001
Three integrated factories span the entire silicone sponge sealing value chain — from raw material to finished seal. Full in-house control, consistent quality, reliable delivery.
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
Production Facility
14+
Extrusion Lines
90+
Production Team
10+ tons
Daily Capacity
20+
Years of Expertise
Vertically Integrated Manufacturing
Full control from raw silicone to finished sponge seal — three factories, one chain. No external dependencies, consistent quality, batch-to-batch traceability.
Platinum-Cured Foaming — Pure & High Performance
Advanced platinum-catalyzed addition foaming system. Unlike peroxide curing: no toxic residues — odorless, FDA/LFGB available; extremely low shrinkage (<0.1%) with uniform, fine cell structure; no blooming, no yellowing — longer service life; green & eco-friendly — RoHS/REACH compliant.
High Resilience · Low Compression Set
Rebound ≥95% · Compression set <5%. No塌陷 — maintains sealing integrity after millions of cycles. -40°C to +200°C operating range.
Fully Waterproof · 5+ Year Outdoor Life
Closed-cell structure — zero water absorption. UV and ozone resistant — no cracking, no degradation. Outperforms EPDM, PVC, and PU foams. UL94 V-0 flame retardant available.
Global Certifications
ISO 9001 · RoHS · REACH · UL94 V-0 (optional) · FDA/LFGB (optional). Full documentation for compliance, audits, and regulatory filings.
Fast Sampling & Reliable Delivery
3-5 day sampling · 5-7 day production after approval. Low MOQ, free samples for qualified buyers, and on-time delivery you can count on.
Silicone Sponge vs. EPDM Sponge vs. NBR Sponge vs. EVA Foam — Which Foam Material Is Right for Your Application?
Silicone sponge, EPDM sponge, NBR sponge, and EVA foam are among the most common foam materials used in sealing, cushioning, and insulation applications. Each offers distinct performance characteristics that make it suitable for different environments and operating conditions.
Silicone sponge — produced through platinum-cured foaming — delivers the widest temperature range and lowest compression set, making it the top choice for demanding sealing applications. EPDM sponge provides excellent weather and UV resistance at a moderate cost, widely used in outdoor and general industrial sealing. NBR sponge excels in oil and fuel resistance, ideal for automotive and industrial fluid handling. EVA foam is the most economical option for indoor, light-duty cushioning and packaging applications.
| Property | Silicone Sponge (Yutian) | EPDM Sponge | NBR Sponge | EVA Foam |
|---|---|---|---|---|
| Foaming / Curing process | Platinum-cured foaming | Peroxide-cured | Sulfur-cured | Chemical foaming |
| Temperature range | -60°C to +250°C (short-term up to +300°C) |
-40°C to +120°C | -40°C to +100°C | -20°C to +70°C |
| Compression set | <5% | ≤8-10% | Moderate | High |
| Rebound rate | ≥95% | Good | Good | Poor (60-70%) |
| Water absorption | None — fully waterproof | Very low | Low | Low |
| Oil / fuel resistance | ❌ Poor | ❌ Poor | ✅ Excellent | ❌ Poor |
| UV / Ozone resistance | ✅ Excellent 5+ years outdoor |
✅ Excellent | ⚠️ Moderate | ❌ Poor |
| Flame retardancy | ✅ UL94 V-0 available |
⚠️ Modifiable | ⚠️ Moderate | ❌ Low — flammable |
| Density | 0.3 – 0.8 g/cm³ | 0.4 – 0.8 g/cm³ | 0.4 – 0.8 g/cm³ | 0.2 – 0.5 g/cm³ |
| Food / medical grade | ✅ FDA/LFGB available |
❌ Not available | ❌ Not available | ❌ Not available |
| Odor | ✅ Odorless | ⚠️ Slight rubber odor | ⚠️ Rubber odor | ⚠️ Varies |
| Service life (outdoor) | 5+ years | 3-5 years | 2-3 years | 1-2 years |
| Relative cost | Higher | Medium | Medium-High | Low |
Choose Silicone Sponge
Widest temperature range, lowest compression set, food/medical-grade compliance, UL94 V-0 flame retardancy, long-term outdoor durability — enabled by platinum-cured foaming.
Choose EPDM Sponge
Cost-effective outdoor weather sealing, UV resistance, and general industrial applications.
Choose NBR Sponge
Oil and fuel resistance — ideal for automotive, engine, and industrial fluid handling applications.
Choose EVA Foam
Low-cost indoor cushioning, packaging, and light-duty applications.
Where Silicone Sponge Seals Are Used — Applications Across Industries
From enclosures and drones to high-temperature equipment, Yutian silicone sponge seals deliver lightweight, waterproof, high-compression sealing — enabled by platinum-cured foaming and extrusion + bonding technology.
Enclosures & Cabinets
Electrical cabinets, telecom enclosures, and outdoor power distribution units demand reliable sealing against moisture and dust. Our silicone sponge seals — produced via platinum-cured foaming — are fully waterproof with zero water absorption. The extrusion + bonding process delivers any profile, any size, with clean bonded joints. Lightweight 0.3–0.8 g/cm³ density and 50%–75% compressibility adapt to uneven surfaces for a complete seal.
Waterproof50-75% Compression0.3-0.8 g/cm³Extrusion+Bonding
LED Lighting & HVAC
Outdoor LED fixtures, solar inverters, and HVAC units require seals that withstand UV exposure, temperature swings, and moisture. Our platinum-cured foaming process delivers excellent UV/ozone resistance with 5+ years outdoor service life. The seals remain flexible from -40°C to +200°C (up to +250°C with high-temp formulation) and are fully waterproof — protecting sensitive electronics from rain, condensation, and thermal cycling.
UV Resistant-40°C to +200°C5+ Year LifeWaterproof
Lawn Mowers & Outdoor Power Equipment
Lawn mowers operate in harsh conditions — moisture, grass clippings, debris, and constant vibration. Our silicone sponge seals provide vibration damping and soundproofing, reducing engine noise and protecting sensitive components. The high compressibility (50%–75%) adapts to uneven housing surfaces, while platinum-cured foaming ensures rebound ≥95% and compression set <5% — no塌陷, even after thousands of operating hours.
Vibration DampingSoundproofing50-75% Compression≥95% Rebound
Drones & UAVs
Weight is critical in drone design. Our silicone sponge seals offer ultra-low density (0.3–0.8 g/cm³) — adding minimal weight while providing waterproof protection for battery compartments, sensor housings, and camera gimbals. The extrusion + bonding process produces any profile with clean, strong joints, while high compressibility absorbs flight vibrations and protects sensitive electronics.
Ultra-Light 0.3 g/cm³Vibration AbsorptionWaterproofExtrusion+Bonding
Vibration Damping & Shock Absorption
Industrial equipment, compressors, and generators generate significant vibration that can damage components and increase noise. Our silicone sponge seals feature 50%–75% compressibility, effectively absorbing mechanical vibration and impact energy. Platinum-cured foaming ensures compression set <5% and rebound ≥95% — consistent damping performance over millions of cycles, reducing equipment wear and extending service life.
50-75% CompressionShock Absorption≥95% ReboundCompression Set <5%
Soundproofing & Noise Reduction
Noise pollution is a growing concern in industrial, automotive, and HVAC applications. Our silicone sponge seals provide excellent soundproofing — the closed-cell foam structure blocks sound transmission through gaps and seams. Extrusion + bonding ensures a continuous seal with no weak points, while platinum-cured foaming delivers consistent material properties for reliable acoustic performance across -40°C to +200°C.
SoundproofingNoise Reduction-40°C to +200°CExtrusion+Bonding
Thermal Insulation
Low thermal conductivity makes silicone sponge seals ideal for thermal barriers in pipe insulation, appliance heat shielding, and equipment thermal management. Platinum-cured foaming creates uniform, fine cell structures that trap air and resist heat transfer. The material maintains flexibility from -40°C to +200°C (up to +250°C with high-temp formula) while fully waterproof properties prevent moisture absorption that could degrade thermal performance.
Thermal Insulation-40°C to +200°CWaterproofPlatinum-Cured Foaming
High-Temperature & Flame-Retardant Applications
For industrial ovens, drying equipment, exhaust systems, and EV battery packs, our silicone sponge seals deliver high-temperature performance up to +250°C (with specialized formulation). Platinum-cured foaming ensures heat aging resistance — no hardening, no cracking. UL94 V-0 flame retardant is available for fire-safe applications, self-extinguishing within 10 seconds with no flaming drips. Extrusion + bonding produces any profile with clean, strong joints for critical safety applications.
Up to +250°CUL94 V-0Heat Aging ResistantPlatinum-Cured Foaming
Frequently Asked Questions — Silicone Sponge Sealing Strips & Gaskets
Quick answers to the most common questions from engineers, procurement professionals, and quality managers — all in one place.
Materials & Performance
Process & Customization
Samples & Procurement
Certifications & Quality Assurance
Still have questions? We're here to help — reach out to our engineering team directly.
Contact Us →Silicone Sponge Seals — Lightweight, Waterproof, High-Compression Sealing for Demanding Applications.
From enclosures and LED lighting to drones, lawn mowers, and high-temperature equipment — Yutian's platinum-cured silicone sponge seals deliver lightweight, fully waterproof, high-compression sealing across the most demanding applications. Our platinum-cured foaming technology ensures ≥95% rebound and <5% compression set — no塌陷, no degradation, even after millions of cycles.
Backed by 20+ years of silicone extrusion and foaming expertise, ISO 9001, RoHS, REACH, and a vertically integrated supply chain — we don't just make sponge seals. We deliver sealing confidence. From prototype to production, every seal, every batch, every time.
Trust Yutian. Trust the seal.
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with products that are incredibly strong, remarkably flexible, and simple to use.”
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One-Stop Silicone Product Solution — Engineered for Excellence, Delivered with Integrity.
From medical-grade tubing and precision peristaltic pump hoses to solid and sponge sealing strips and gaskets — Yutian serves industries where quality is not optional. Our vertically integrated supply chain spans raw silicone compounding, precision extrusion, platinum-cured foaming, and finished assembly, ensuring consistent quality across every product line. Whether your application demands ISO 13485 medical compliance, FDA/LFGB food-contact safety, or extreme-temperature industrial performance, we deliver solutions engineered to your exact requirements.
With 20+ years of silicone expertise, ISO 9001 certification, and a commitment to innovation recognized as a National High-Tech Enterprise — we don't just manufacture silicone products. We partner with you from concept to production, providing engineering support, rapid sampling, and reliable delivery that you can count on. Because when performance matters, there's no room for compromise.
Trust Yutian. Trust the difference.
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