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Specializing in the production of highquality silicone rubber products
PRODUCT
Specializing in the production of highquality silicone rubber products
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Steel-Reinforced Silicone Sealing Strip for EV Battery Packs / Metal-Insert Battery Enclosure Seal
Yutian manufactures steel-reinforced silicone sealing strips for EV battery packs and new energy vehicles. Metal insert embedded – clips onto enclosure edges with strong grip, no adhesives needed. Withstands -40°C to 300°C, high resilience, low compression set, IP67 waterproof. Ideal for battery enclosures, energy storage, and automotive sealing. Custom profiles and grip force. Factory direct, wholesale only. Free samples. ISO 9001.
- Composite Structure: Made with embedded steel wire and dual-density silicone for enhanced strength and sealing performance.
- Superior Sealing: Low hardness silicone ensures tight sealing, reducing cold air leakage and improving energy efficiency.
- Anti-Deformation: High hardness silicone + steel reinforcement provides excellent support and prevents shape distortion.
- Extreme Temperature Resistance: Performs reliably in low temperatures down to -60℃, ideal for cold storage and medical freezers.
- Food-Grade Safety: Platinum-cured silicone, non-toxic, odorless, and compliant with FDA standards.
- Long Service Life: Offers better durability and sealing effect than traditional silicone strips, reducing maintenance needs.
Product Features
Application
| Baby Daily Necessities | State Grid | BS/COM/ESS | Optoelectronics industry |
| mechanical seal | New energy vehicles | Home appliance | Sports equipment |
- Parameters
- Composite Structure: Made with embedded steel wire and dual-density silicone for enhanced strength and sealing performance.
- Superior Sealing: Low hardness silicone ensures tight sealing, reducing cold air leakage and improving energy efficiency.
- Anti-Deformation: High hardness silicone + steel reinforcement provides excellent support and prevents shape distortion.
- Extreme Temperature Resistance: Performs reliably in low temperatures down to -60℃, ideal for cold storage and medical freezers.
- Food-Grade Safety: Platinum-cured silicone, non-toxic, odorless, and compliant with FDA standards.
- Long Service Life: Offers better durability and sealing effect than traditional silicone strips, reducing maintenance needs.
Product Features
Application
| Baby Daily Necessities | State Grid | BS/COM/ESS | Optoelectronics industry |
| mechanical seal | New energy vehicles | Home appliance | Sports equipment |
Yutian · Factory-direct manufacturer · 18+ years silicone extrusion expertise · 6,800m² · 14+ lines
Steel-Reinforced Silicone Sealing Strip for EV Battery Packs
Metal-insert · Vibration-proof · -40°C to 300°C · Custom profiles · IP67
✓ EV battery pack enclosures · IP67/IP68✓ Co-extruded steel + silicone – no delamination✓ Clip-on · no adhesives · reusable
Co-extruded steel + silicone – bonded for lifeMechanical grip – won't loosen under vibrationCustom profiles · grip force adjustableFree 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 steel insertion and precision co-extrusion – three integrated factories ensure complete quality control at every stage. Steel and silicone are bonded during co-extrusion – not post-inserted – ensuring no delamination, no separation, and long-term reliability.
🧪
Guilin Yutian
Silicone raw material · source control
⚙️
Dongguan Huahong
Compounding & auxiliaries · cost optimization
🏗️
Dongguan Yutian
Steel-reinforced co-extrusion · NEV sealing
Raw materialCompoundingCo-extrusionFinishing
6,800m² production facility14+ extrusion lines90+ production team10+ tons daily capacityISO 9001 certified
Why EV battery pack manufacturers choose Yutian
Co-extrusion technology
Steel + silicone co-extruded – not post-inserted. No delamination, no separation.
Custom profiles & grip force
U/D/P/custom shapes · grip force adjustable for 1-5mm sheet metal.
Extreme temperature performance
-40°C to 300°C · >95% rebound · low compression set.
NEV industry focus
Specialized in EV battery packs, energy storage, automotive sealing.
Integrated manufacturing
Full control from raw silicone to steel-reinforced seal – three factories, one chain.
Global certifications
ISO 9001 · RoHS · REACH · UL94 V-0 (optional)
Engineered for EV battery packs
🔗
Steel-reinforced – strong grip, no adhesive failure
Galvanized steel or stainless steel · co-extruded
Our steel-reinforced silicone sealing strip embeds a steel band or wire inside the silicone profile during co-extrusion – not post-inserted. The steel provides stable clamping force that grips the battery pack enclosure edge securely – solving the common problem of adhesive-backed seals peeling off under vibration. Clamping force adjustable to match your enclosure sheet metal thickness (1-5mm).
→ Stays put · no adhesives · vibration-proof
🔩
U-shape clip-on – no adhesives, no screws
Clips directly onto enclosure edges · reusable
The U-shaped design allows the seal to be clipped directly onto the battery pack enclosure edge – no glue, no tape, no screws. Installation is fast and requires no curing time. Removable and reusable – ideal for battery pack maintenance and service access. No adhesive residue, no clean-up.
→ Faster assembly · lower labor cost · maintenance-ready
🌡️
Silicone outer – elastic sealing, extreme temperature
-40°C to 300°C · >95% rebound · low compression set
The platinum-cured silicone outer layer delivers exceptional elasticity and sealing performance across a -40°C to 300°C temperature range. >95% rebound rate – returns to shape after compression. Low compression set – compensates for thermal expansion and contraction. Ideal for battery packs that experience wide temperature swings during charging, discharging, and extreme weather.
→ Seals reliably · extreme heat and cold
🛡️
IP67/IP68 waterproof – protects against water and dust
Mechanical grip + elastic seal = IP67/IP68 compliance
Battery packs must meet specific IP ratings to ensure protection against water and dust. Our steel-reinforced silicone sealing strip provides a waterproof and dustproof barrier, reducing risks of damage caused by humidity or airborne particles. IP67 compliance is verified through standardized testing defined under IEC 60529.
→ Waterproof · dustproof · worry-free
🔥
Fire-retardant – a safety barrier
Inherently fire-retardant · low smoke / toxic fume emissions
Silicone is inherently fire-retardant, and when it does burn, emissions of smoke or toxic fumes are very low. This makes our steel-reinforced silicone sealing strip an important safety barrier in the event of battery thermal runaway – providing critical time for thermal management and evacuation.
→ Safety barrier · thermal runaway protection
🏗️
Steel + silicone co-extruded – no delamination
Bonded during extrusion – not post-inserted
Unlike competitors who insert steel after extrusion (prone to separation), our steel and silicone are co-extruded – the steel is embedded during the extrusion process, creating a permanent chemical and mechanical bond. No delamination, no separation, no risk of the steel slipping out. Long-term reliability for EV battery pack applications.
→ Built to last · no separation
📐
Customizable – profile, steel type, grip force
Any shape · any spec · your design
Choose from galvanized steel (cost-effective for indoor/energy storage) or stainless steel SUS304 (corrosion-resistant for EV battery packs). Customize profile shape – U-shape, D-shape, P-shape, or any cross-section. Grip force adjustable to match your enclosure sheet metal thickness (1-5mm). Send your drawing – we'll produce the exact seal you need.
→ Your spec · our production
Steel insert types – choose the right one for your application
| Steel Type | Best For | Key Benefit |
|---|---|---|
| Galvanized steel | Indoor energy storage cabinets, stationary battery systems | Cost-effective · good corrosion resistance for indoor use |
| Stainless steel (SUS304) | EV battery packs, outdoor enclosures, marine, automotive | Superior corrosion resistance · salt spray resistant · long outdoor life |
💡 Selection guide: Indoor energy storage → galvanized steel. EV battery packs (涉水, salt spray environments) → stainless steel. We can help you choose based on your application.
Why silicone for EV battery pack sealing?
Battery packs operate under complex conditions: high temperatures during charging, low temperatures in winter, vibration during driving, and high-pressure water spray during wading. Here's why silicone outperforms other materials:
| Property | Silicone (Yutian) | EPDM / Rubber | PVC / Epoxy |
|---|---|---|---|
| Temperature range | ✅ -40°C to 300°C | ⚠️ -40°C to 150°C | ❌ -10°C to 80°C |
| Thermal cycling tolerance | ✅ Excellent – maintains elasticity | ⚠️ Hardens under extreme heat or cold | ❌ Cracks under thermal cycling |
| Compression set | ✅ Low – rebounds after compression | ⚠️ Moderate – permanent deformation | ❌ Poor – permanent deformation |
| Fire resistance | ✅ Inherently fire-retardant | ⚠️ Moderate | ❌ High smoke / toxic emissions |
| Lifespan | ✅ 15-25+ years | ⚠️ 7-12 years | ❌ 5-8 years |
💡 For EV battery packs: Silicone is the only choice that meets the full range of performance, safety, and durability requirements. EPDM and other materials harden or soften under extreme temperatures – sealing performance cannot be guaranteed.
Technical specifications – for engineering & procurement teams
| Parameter | Standard | Custom |
|---|---|---|
| Steel insert | Galvanized steel | Stainless steel (SUS304) |
| Silicone material | Platinum-cured silicone | |
| Profile shapes | U / D / P | Any cross-section |
| Hardness (Shore A) | 60±5 A | 40-80 A |
| Temperature range | -40°C to 300°C | Extended |
| Rebound rate | ≥95% | — |
| Compression set | <10% (@ 150°C / 22h) | — |
| Waterproof rating | IP67 | IP68 |
| Sheet metal thickness | 1 – 5 mm | Adjustable |
| Color | Black / Gray | Custom colors |
| Certifications | ISO 9001, RoHS, REACH · UL94 V-0 (optional) | |
Steel-reinforced seal vs. adhesive-backed seal – battery pack application
| Feature | Steel-Reinforced Seal (Yutian) | Adhesive-Backed Seal |
|---|---|---|
| Fixing method | ✅ Mechanical clamping – clips onto enclosure edge | ❌ Adhesive – peels off over time |
| Vibration resistance | ✅ Strong grip – won't loosen or shift | ❌ Prone to peeling and shifting under vibration |
| Reusable | ✅ Yes – removable and reusable | ❌ No – adhesive fails after removal |
| Installation speed | ✅ Fast – clips on directly | ❌ Slow – surface cleaning, peel-and-stick |
| Temperature range | ✅ -40°C to 300°C | ⚠️ -40°C to 200°C |
| Best for | EV battery packs, energy storage, automotive | Light-duty, static sealing |
Applications – new energy vehicle battery systems
🔋
EV battery pack enclosure
Upper cover to lower housing sealing · IP67/IP68 waterproof · dustproof
📦
Energy storage cabinets
Cabinet door sealing · dustproof · waterproof · outdoor enclosures
🧩
Battery module sealing
Module-to-enclosure sealing · vibration damping · thermal management
🔌
Charging port sealing
Waterproof sealing around charging interface · moisture protection
🔧
Maintenance access sealing
Removable · reusable · service access panels
❄️
Thermal management sealing
Liquid cooling plates · air ducts · thermal system components
Made to your specification – custom solutions for NEV applications
Steel type – Galvanized steel / Stainless steel (SUS304)
Profile shape – U / D / P / Any cross-section (send your drawing)
Sheet metal thickness – 1-5mm (grip force adjustable)
Hardness – 40-80 Shore A
Color – Black / Gray / Custom colors
Sample lead time – 15-20 days for custom profiles
Design confidentiality – NDAs available
Co-extrusion expertise – steel + silicone bonded for life
Case studies – real NEV projects
EV battery pack manufacturer – stainless steel insert seals for new battery enclosure line · SUS304 corrosion-resistant · IP67 waterproof · -40°C to 300°C · 3+ years production · zero field failures · zero water ingress complaints
Energy storage equipment manufacturer – galvanized steel insert seals for outdoor cabinet doors · grip force adjusted to specific sheet metal thickness · 100,000+ units sealed · 5+ years outdoor · no degradation
Automotive Tier 1 supplier – steel-reinforced seals for EV battery pack service access panels · U-shape clip-on · removable and reusable · strong grip under vibration · 2+ years partnership · zero complaints
New energy vehicle OEM – custom-profile steel-reinforced seals for new EV model · custom cross-section profiles · matched enclosure sheet metal thickness · delivered in 20 days · full production · consistent quality
Certifications & quality – for NEV industry compliance
ISO 9001
Quality management
CertifiedRoHS / REACH
Compliant
CertifiedUL94 V-0
Flame retardant
Option⭐ National High‑tech Enterprise | 🏭 Class 8 cleanroom | 🏭 18+ years
🎁 Cooperation benefits – for NEV manufacturers
📦
Free samples
Standard sizes free · Sample with COA · Test before you commit
🎨
Custom development
Sample in 15-20 days · low MOQ · design confidentiality
⚡
Fast delivery
Production after approval · bulk capacity · on-time delivery
Customer feedback – from NEV industry leaders
“Yutian's steel-reinforced silicone seals are used in our EV battery pack production line. The stainless steel insert provides secure grip under vibration – no adhesive failure issues. The -40°C to 300°C range handles our thermal cycling requirements perfectly. A reliable partner for our NEV program.”
— Engineering Manager, EV Battery Manufacturer
“We switched to Yutian's steel-reinforced seals for our energy storage cabinets. The U-shape clip-on design saves our assembly team 70% installation time compared to adhesive-backed seals. No more peeled-off seals from field installations. Highly recommended.”
— Production Manager, Energy Storage Equipment Manufacturer
Frequently asked questions – for NEV battery pack manufacturers
Why do battery pack seals need a steel skeleton?
Battery packs experience continuous vibration during vehicle operation. Ordinary adhesive-backed seals peel and shift under vibration, leading to seal failure. The steel skeleton provides mechanical clamping force – grips the enclosure edge securely and won't loosen or fall off, fundamentally solving the adhesive failure problem.
Why must battery pack seals be silicone?
Battery packs operate in complex conditions: high temperatures during charging, low temperatures in winter, vibration during driving, and high-pressure water spray during wading. Silicone maintains elasticity across -40°C to 300°C, has low compression set, is fire-retardant, and resists aging. EPDM, PVC, and other materials harden or soften under extreme temperatures – sealing performance cannot be guaranteed.
What steel types are available? How do I choose?
Galvanized steel – cost-effective for indoor energy storage cabinets. Stainless steel (SUS304) – for EV battery packs (涉水, salt spray environments), corrosion-resistant. We can help you choose based on your application environment.
What sheet metal thickness does the U-shape fit?
Standard fits 1-5mm sheet metal. We can adjust the grip force to match your specific enclosure thickness – just let us know your requirement.
Will the steel and silicone separate over time?
No. Our steel and silicone are co-extruded – bonded during the extrusion process, not post-inserted. This creates a permanent bond that does not delaminate or separate over time.
What temperature range can these seals handle?
-40°C to 300°C – suitable for EV battery pack charging/discharging heat, extreme winter cold, and everything in between.
Can you customize the profile shape and grip force?
Yes. U-shape, D-shape, P-shape, or any cross-section. Grip force adjustable for 1-5mm sheet metal. Send your drawing – we'll produce the exact seal you need.
What is the lead time for custom orders?
Samples: 15-20 days. Production: after sample approval.
Can I get a free sample?
Yes – standard sizes free for qualified B2B buyers. Contact us to request a sample for testing.
What certifications do you have?
ISO 9001, RoHS, REACH. UL94 V-0 flame retardant available on request.
Need steel-reinforced silicone sealing strips for your EV battery pack or energy storage project?
Factory-direct · Wholesale only · Free samples · OEM/ODM · Custom grip force · Co-extrusion expertise
🎁 First 10 NEV inquiries → free sample + priority tooling📦 Free sample with COA test report
Request a quote →Dongguan Yutian Silicone Rubber Technology Co., Ltd. | Steel-reinforced silicone sealing strip for EV battery packs manufacturer | Metal-insert · Vibration-proof · -40°C to 300°C | Custom profiles & grip force | Co-extrusion · ISO 9001 · Wholesale only
Tel/Whatsapp: +86 18028921514 | Email: salesmanager@yutiansilicone.com
Tel/Whatsapp: +86 18028921514 | Email: salesmanager@yutiansilicone.com
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