China Thermal Insulation Sheet Manufacturer & Company

1. The Thermodynamics of High-Performance Insulation: Transcending Traditional Barriers

In modern industrial applications, thermal control is no longer just about choosing thick insulation materials. Traditional systems like polyurethane foam, expanded polystyrene (EPS), and mineral wool rely on trapped gas pockets within a polymer or mineral matrix to slow down heat transfer. However, these materials are limited by the thermal conductivity of the gas itself (such as air, at approximately 0.026 W/m·K). When industrial space constraints, carbon reduction targets, and safety requirements become strict, traditional insulation sheets fall short.

Advanced vacuum insulation technology breaks through this limit by eliminating the gas medium entirely. In vacuum insulation panels (VIPs), the core material is sealed under high vacuum within a gas-tight envelope. This setup minimizes the three modes of heat transfer:

• Solid Conduction: Minimized by using highly porous core materials like fumed silica or ultra-fine glass fibers, which create a tortuous path for heat flow.
• Gaseous Conduction: Eliminated by extracting air from the panel, lowering pressure to less than 1 mbar. This creates a state where the mean free path of any remaining gas molecules is larger than the pore size (known as the Knudsen effect).
• Radiative Heat Transfer: Controlled by adding opacifiers (such as titanium dioxide or silicon carbide) that absorb and scatter infrared radiation, even at elevated temperatures.

2. Core Materials Compared: Fumed Silica vs. Fiberglass Matrices

Industrial designers face a key decision when selecting core structures for vacuum-insulated systems. Each material offers distinct trade-offs in thermal conductivity, long-term durability, and temperature limits:

Fumed Silica Core: Made from synthetic amorphous silica particles. Its nano-sized pores allow it to maintain low thermal conductivity (~0.004 W/m·K) even if the vacuum level degrades slightly over time (to 10–50 mbar). This makes fumed silica panels highly durable, with an expected service life of 30 to 50 years. They are ideal for construction, cold chain logistics, and high-temperature systems.

Fiberglass Core: Composed of ultra-fine glass fibers. It achieves the lowest initial thermal conductivity (~0.0015 W/m·K) under high vacuum (<0.1 mbar). However, because its pores are larger than those of fumed silica, its performance drops significantly if the vacuum degrades. As a result, fiberglass panels require high-barrier envelopes and are best suited for controlled environments like home refrigerators and freezers.

Our production base in Nanchong City, Sichuan Province, is one of China's largest facilities for high-vacuum applications. Partnering with the CBVAC Group, we integrate vacuum chamber manufacturing directly with our core insulation production. This vertical integration provides several key advantages:

Additionally, keeping core material preparation, barrier film laminating, and vacuum sealing in one facility helps shield customers from supply chain issues. Whether dealing with raw material fluctuations or changing shipping rates, our streamlined manufacturing maintains steady lead times for global OEMs.

To meet the growing demand for sustainable, high-efficiency insulation, Zerothermo Technology is continuously advancing its materials science roadmap. Our research and development focuses on three primary areas:

• Hybrid Core Configurations: By combining fumed silica matrices with structured glass microfibers, we aim to develop a hybrid core. This core will offer the low thermal conductivity of glass fibers while retaining the durability and higher internal pressure tolerance of fumed silica.
• Eco-Friendly High-Barrier Envelopes: We are working to replace traditional metalized polymer films with recyclable, bio-derived barrier sheets. This will make the panels easier to recycle at the end of their lifecycle without sacrificing gas impermeability.
• Smart Insulation Sheets: We are testing VIP panels with integrated, ultra-thin RFID sensors. These sensors will monitor internal vacuum levels in real-time, allowing logistics teams to verify the thermal integrity of pharmaceutical shipping containers during transit.