Solid Core D-Shape Closed Cell Silicone Sponge Seal Strip Non-Hollow Thermal Insulation Foam Gasket

Product Overview

Our D-Shape Closed-Cell Sponge Silicone Seal Strip features a soft, compressible foam body with a solid (non-cored) cross-section. The closed-cell structure prevents moisture absorption and provides excellent thermal insulation, while the solid core ensures uniform compression without collapse. This flexible foam seal is ideal for applications requiring low closure forces, vibration damping, and temperature isolation.

Key Features

• Closed-Cell Sponge Structure: Independent bubbles prevent water/moisture absorption – waterproof and insulating.
• Solid Core (Non-Cored): Fully filled foam body with no internal cavity – provides consistent support and sealing pressure.
• Excellent Thermal Insulation: Low thermal conductivity reduces heat transfer – ideal for HVAC and refrigeration.
• Soft & Compressible: Low compression force required – seals easily on irregular or uneven surfaces.
• D-Shape Profile: Flat mounting base with curved sealing top for reliable gap closure. Supplied without adhesive as standard.
• Temperature Range: -40°C to +200°C (-40°F to 392°F) or more.
• Vibration Damping: Absorbs shock and reduces noise transmission.
• Flexible Length Options: 1m, 3m, 10m cut lengths or 50–100m bulk rolls.

Specifications

1. Material: Closed-Cell Silicone Sponge (Foam)
2. Cross-Section: D-Shape, Solid Core (Non-Cored / No Cavity)
3. Density (g/cm³): 0.60 – 0.80
4. Compression Set (22h @ 70°C): ≤ 25%
5. Water Absorption: ≤ 5% (closed-cell prevents ingress)
6. Thermal Conductivity (W/m·K): ≤ 0.10
7. Working Temperature: -40°C to +200°C or more
8. Length: 1m / 3m / 10m cut pieces, 50–100m per roll
9. Optional Accessory: Custom self-adhesive backing

Application

• HVAC Systems: Sealing ductwork, air handling units, and ventilation grilles – prevents air leakage and thermal loss.
• Refrigeration & Cold Storage: Gasketing for walk-in coolers, freezers, and refrigerated display cases.
• Automotive Weatherstripping: Door seals, trunk seals, and engine bay insulation.
• Marine & RV Seals: Waterproof sealing for hatches, compartments, and access panels.
• Electronic Enclosures: Dustproofing and thermal management for sensitive equipment.
• Soundproofing: Acoustic seals for studio doors, generator enclosures, and machinery covers.

Size Chart

Return & Refund Policy

Thank you for shopping with us. We fully guarantee product quality and offer transparent return, refund and exchange policies for all buyers.

1. Eligible Return Window: All items qualify for return or exchange within 30 calendar days upon receipt. You must submit a return request through our official email or online contact form before sending items back.
2. Mandatory Return Requirements: Items shall remain unused, uncut, unaltered and unassembled with original packaging completely intact. No scratches, stains, abrasion or physical damage on goods. Custom-length, custom-color and bespoke customized items are non-returnable and non-exchangeable. Bulk wholesale custom orders do not qualify for free unconditional returns.
3. Shipping & Return Fees: If returns result from factory defects, incorrect items or delivery errors: we cover all return freight and issue a full refund. If you return items for personal reasons (mis-purchase, no longer required, unsatisfied appearance): you take full responsibility for return shipping fees and any customs charges. Initial delivery fees are non-refundable. International shipments may incur import duties, tax and processing fees, which shall be paid by the liable party.
4. Refund Workflow: Reach out to our support team to obtain return authorization and our designated return address. Reship the package and share your tracking number with us. We will conduct a full product inspection once we receive the returned parcel. For eligible returns, full or partial refunds will be issued to your original payment account within 3–7 business days.
5. Item Exchange Service: Product exchange is available within the valid return period. Additional exchange shipping costs need mutual confirmation in advance.
6. Quality Warranty Coverage; For manufacturing defects occurring during standard service life: We provide after-sales service and free replacement for faulty goods. Warranty does not cover man-made damage, improper installation, misapplication and natural wear and tear.
7. Non-Returnable Goods List

• Custom products (custom cut length, custom color, custom formulation, OEM orders)
• Goods cut, installed, used or damaged by customers
• Clearance stock and special promotional discounted items