Mylar Reflective Film

Since 2009, the Xiashi Factory in Xiong County has jointly developed architectural envelope mylar reflective film with European and American counterparts, with its complete product range having been deployed in over a thousand projects. These solutions fundamentally reduce annual energy consumption for heating and cooling in buildings while preventing common long-term engineering issues such as moisture damage to insulation layers, condensation-induced corrosion of metal components, and wall mold growth.

Specification

What is a mylar reflective film?

The architectural mylar reflective film is a multifunctional energy-saving building envelope material fabricated by thermally pressing a high-purity mirror aluminum foil layer combined with a high-density spunbonded polypropylene polymer substrate, a dedicated thermal and moisture regulating material designed for passive ultra-low-energy buildings.

Unlike conventional PE or non-woven vapor barrier films that merely block water vapor, this advanced membrane combines four core functions: infrared radiation reflection, high-density vapor barrier performance, airtight wind resistance, and weathering-corrosion resistance. It specifically addresses the issue of radiant heat transfer, which accounts for over 60% of total building heat loss. When paired with an insulation layer and a waterproof permeable film, it forms a comprehensive thermal and moisture balance system for walls and roofs.

Principle of operation

Infrared radiation reflection principle: For surface layers of 7 μm high-purity mirror-grade aluminum foil, emissivity ≤0.05 and infrared thermal reflectivity 95%.

During summer: It reflects short-wave infrared radiation from the sun back outdoors, significantly reducing heat storage on roofs and exterior walls and lowering air conditioning loads.

During winter: It reflects long-wave radiant heat from indoor heating back into the interior, retaining thermal energy and substantially cutting heating energy consumption, thereby addressing common issues such as temperature loss through thermal bridges in steel structures and window frames, as well as condensation and water dripping.

Key prerequisite: A minimum air gap of ≥20 mm must be maintained between the aluminum foil reflective surface and the substrate; direct adhesion to the panel will compromise its reflective and thermal insulation performance.

The high-density vapor barrier and moisture-proof material features a water vapor transmission rate of ≤7 g/(m²·24 h) for the underlying polypropylene substrate, significantly exceeding the limits specified in national standards for vapor barriers. It effectively prevents indoor humidity from penetrating the insulation layer through human bodies or kitchen/bathroom surfaces, avoids substantial degradation of thermal performance due to water absorption by insulation materials, and eliminates wall mold growth and metal component corrosion.

The entire system employs a coordinated water-vapor management logic: mylar reflective film (with moisture barrier and thermal lock function) is installed on the indoor side → followed by an intermediate insulation layer → then a waterproof vapor-permeable membrane on the outdoor side (for removing residual moisture from the building envelope). Joint areas are sealed with reflective window tape, achieving a three-dimensional balance of preventing internal moisture ingress, facilitating external moisture removal, and eliminating radiant heat loss—thereby overcoming the engineering limitations inherent in using single-material solutions.

The fundamental difference from the core essence of ordinary products

The capabilities for heat transfer control vary.

Standard: Only blocks water vapor convection, completely unable to handle radiant heat; energy consumption for heating and cooling decreases by only 25%–30%.

Mylar Reflection film: 95% infrared reflection, eliminating radiation loss at the source and achieving comprehensive energy savings of 36%–40%, meeting the upper limit of NIST building energy efficiency calculations.

Different climate scenarios

Conventional membranes are only suitable for ordinary self-built houses in temperate regions; mylar reflective film are designed for severe cold heating areas in northern regions, high-temperature and high-salt-fog coastal areas in southern regions, and scenarios with significant temperature variations on metal roofs.

Different levels of durability and corrosion resistance

Conventional PE film deteriorates within 1 year; this product combines aluminum foil with dual UV and salt spray resistance, maintaining stability for 8–10 years without aluminum loss or cracking.

Additional Feature Differences

It exhibits combined properties of noise reduction, and protection against metal condensation-induced corrosion; conventional films lack noise-reduction capabilities.

Factory Supply & Business Support

As the direct manufacturer, we support custom width slitting, private‑label packaging and mixed container loading for bulk buyers.

We can provide complete sets of third‑party test reports for export clearance. Qualified buyers may apply for physical samples for laboratory verification and on‑site trial installation.

Our technical team offers build‑up‑scheme suggestions tailored to local climate and building types.

Reach out to our sales team if you need full test documents, sample support or customized specification solutions for your building‑envelope projects.