Pore Structure Defines Low-Thermal-Conductivity Insulation Performance
This image is a nano-CT scan of a Y-Warm sample. The sample was reconstructed from sequential cross-sectional scans along the XY, XZ, and YZ axes, generating approximately 3,000 slice images per sample. The image shown here is a single slice selected from this dataset.
In the image, the white regions represent the solid walls of the nano-scale closed cells (the polyester scaffold structure). The black regions represent pore spaces with micrometer-scale diameters.
Pore wall thickness: 20–280 nm
Pore diameter: 30–190 μm
This image was obtained by cutting Y‑Warm with a sharp blade to expose its cross‑section, followed by gold‑sputter coating and imaging using SEM (scanning electron microscopy).
The internal structure of Y‑Warm exhibits a honeycomb‑like morphology, composed of nano‑scale pore walls and discrete, micrometer‑scale isolated pores.
From a porous‑materials perspective, closed‑cell structures generally deliver better thermal insulation than open‑cell structures; smaller pores tend to improve insulation performance compared to larger ones. In addition, thinner cell walls reduce material density and increase resistance to heat transfer, which further enhances thermal‑insulation efficiency.
Y-Warm is a fabric, yet it does not feel quite like one. It resembles paper, yet is not paper.
Its surface is slightly rough, yet provides a warm hand feel in winter. Even after several days in a -60°C chamber, this thin thermal insulation material does not feel icy against the skin. It can absorb several times its own weight in water while still remaining afloat on the surface.
Features & Performance
Due to its rough surface and ultra-thin structure, the absolute thermal conductivity of this thin thermal insulation material cannot be precisely measured using standard methods.
Measured values vary depending on the testing method used. The table below provides reference data across multiple standardized approaches — all confirming Y-Warm's performance as a reliable low thermal conductivity insulation.
When the outer fabric is frozen through, the Y-Warm layer significantly blocks the inward conduction of cold air. Conversely, when body heat is emitted, the layer minimizes heat loss. It effectively reduces the exchange and conduction of thermal energy.
An eco-friendly antibacterial agent compliant with textile safety and environmental standards is integrated into the polymer. During material formation, the structure encapsulates the agent, allowing antibacterial performance to remain effective even after repeated washing.
Y-Warm's surface is rough due to its micrometer-scale pore structure, which significantly increases the specific surface area and results in exceptionally high emissivity. This makes Y-Warm an effective heat shield fabric with far-infrared functionality.
The front surface is rough, while the back surface is smooth.
For Y-Warm flexible insulation material, thermal insulation performance is theoretically equivalent regardless of which side faces outward.
Choose the orientation that best suits your application requirements.
Width: 150cm
Per roll: 50m
Per box: 2 rolls/100m
Inner packaging: plastic film
Outer packaging: cardboard box
It has a certain hand feel and is only suitable for use as an insulating layer in winter jackets, shoes, and other cold-weather items; it also has good wrinkle recovery.
Y‑Warm exhibits minimal stretch in both warp and weft directions. Where stretch is required, material may be cut on the bias.
A 50‑meter roll of Y‑Warm can be easily lifted, rotated and tossed with one hand.
Wash with cold water
Machine washable
Low-temperature drying
Storage and maintenance: Same as standard textile raw materials and finished goods.
Shelf life: Performance remains stable indefinitely provided the material structure is undamaged.
Textile CLO and RCT test methods are designed for fluffy insulating materials, and results correlate directly with material thickness. Y‑Warm is an ultra‑thin high‑performance insulation that cannot be effectively evaluated by standard CLO and RCT testing.