Aramid Honeycomb

Aramid honeycomb cores are hexagonal-celled structures manufactured by impregnating aramid base paper with phenolic resin, followed by processes including adhesive application, lamination, hot-press curing, expansion, stabilization, and slicing.

These cores are categorized into two main types: meta-aramid (e.g., Nomex, widely used for aircraft interiors) and para-aramid (e.g., Kevlar, known for high structural strength).

As non-metallic sandwich core materials, they eliminate the risk of electrochemical corrosion associated with metals.

1. Mechanical Properties: Lightweight, with a high strength-to-weight ratio, fatigue resistance, and impact resistance; para-aramid offers superior toughness and load-bearing capacity.

2. Thermal Properties: Long-term service temperature: −60°C to 150°C; short-term peak temperature: 180°C to 200°C; low coefficient of thermal expansion.

3. Dielectric Properties: Low electromagnetic wave loss.

4. Flame-Retardant Properties: LOI ≥28%; self-extinguishing upon removal from a flame; no melting or dripping; low smoke and low toxicity.

5. Environmental Resistance: Resistant to salt spray, mold, and weak acids and alkalis; no electrochemical corrosion; not resistant to concentrated strong alkalis or strong oxidizing agents.

Aramid honeycomb core material is primarily used as the core layer in sandwich panels. Thanks to its high strength-to-weight ratio, low smoke emission, flame retardancy, and excellent electromagnetic wave transparency, it is widely applied in sectors such as aerospace, rail transit, and military electronics.