Thermal Wool Fleece vs. Silicone Foam Sheet: How to Choose the Best Insulation and Cushioning Material for You?

  When selecting insulation, soundproofing, and cushioning materials, thermal insulation wool felt and silicone foam board are two common yet distinct options. Each material serves different industrial, residential, and commercial applications due to their unique properties. This article provides a comprehensive comparison of these two materials to help you make an informed choice.

1. Core Feature Comparison Overview

II. In-depth Analysis of Material Properties

1. Insulated Woolen Felt: A Natural Temperature Guardian

Material and Texture: Crafted from natural wool or premium recycled wool fibers, this product is made through needle-punching or bonding techniques. It features a soft, elastic texture with a warm, skin-friendly feel.

Insulation mechanism: The heat is retained by a static air layer between fibers, similar to how down jackets maintain warmth.

Humidity regulation: Wool fibers possess moisture absorption and release capabilities, absorbing moisture in humid environments and gradually releasing it to maintain comfort.

Limitations: Prolonged exposure to high temperatures (typically>100°C) or open flames may cause shrinkage and carbonization; the ability to withstand permanent compression deformation is generally poor, and the thickness may decrease under long-term heavy pressure.

2. Silicone Foam Board: A Versatile Product of Technological Synthesis

Material and Technology: Based on silicone gel, a uniform cellular structure is formed through chemical or physical foaming. It can be manufactured into closed-cell (waterproof and dustproof) or open-cell (sound-absorbing and breathable) types as required.

Performance stability:

Thermal stability: Typically maintains stable performance within the range of-60°C to +200°C, with short-term tolerance for higher temperatures. (Heat Guard Series --The silicone foam sheet From Sanpu Silicone can withstand 315°C for 24 hours)

Weather resistance: UV-resistant, ozone-resistant, aging-resistant, with long outdoor service life.

Chemical inertness: stable to most chemicals and resistant to corrosion.

Formal diversity: can be combined with adhesive backing, fabric, or molded into complex shapes, offering flexible integration design.

3. Usage Environment and Typical Application Scenarios

Ideal Scene of Insulation Wool Felt

Home and apparel sector:

Home: carpet underlay, wall decoration sound absorption, craft padding.

Clothing: high-end coat lining, thermal layer for footwear, and inner lining for hats.

Light Industry and Cultural Creativity:

Soundproofing for musical instruments (e.g., piano pedal pads) and shockproof packaging for precision instruments

Photography box insulation layer, exhibition props cushioning material.

Environmental sensitive scenarios:

 Areas such as children's products, pet supplies, and organic product packaging emphasize natural materials.

Main Application of Silicone Foam Board

Industry and electronics:

Thermal insulation for high-temperature equipment (e.g., ovens, engine compartments, and pipeline insulation).

Thermal pads, dust seals, and vibration dampers for electronic products (e.g., 5G base stations and new energy vehicle battery packs).

Architecture and Transportation:

Building expansion joint filling, door and window sealing strip.

Fireproof and soundproof layer of high-speed train and airplane interior.

Severe environment:

Sealing for outdoor communication equipment, sterilizable buffer for medical devices, and FDA-compliant sealing for food machinery.

IV. Price and Cost Considerations

Price range overview (affected by thickness, density, and brand)

Thermal wool felt: Typically priced per square meter or kilogram. Mid-range products range from ¥50 to ¥150 per square meter. Pricing is influenced by factors such as wool purity, weight, and whether flame-retardant treatment has been applied. The price of natural wool felt is significantly higher than that of recycled wool.

Silicone foam board: Typically priced per sheet size or custom order. Standard specifications range from ¥100 to ¥400 per square meter. Pricing is influenced by factors such as silicone purity, foam density, temperature resistance grade, whether back-coated, and customization precision. Special high-temperature resistant or flame-retardant models are more expensive.

lifecycle cost analysis

Short-term projects or light-duty applications: Wool felt is often preferred for its low unit cost, making it ideal for one-time or short-term insulation needs.

Long-term and harsh environmental use: Although silicone foam boards require a higher initial investment, their outstanding durability, stability, and low maintenance needs often make them more cost-effective throughout their entire lifecycle.

V. How to choose: A guide to key decisions