PET Thermoformed Acoustic Felt

High-end acoustic grades can contain 65%–75% microfine PET fibers. These fibers have a linear density of 0.1–1.0 dtex and a diameter of about 1–5 μm.

The fine fibers increase the internal surface area available for contact with sound waves. This structure focuses on noise between 500 Hz and 8 kHz, including motor noise, vehicle-cavity sound, and medium- to high-frequency noise near doors and front bulkheads.

High-end grades have a raw-felt basis weight of 600–1,200 g/m². Finished density is 0.02–0.06 g/cm³, and thickness is 15–30 mm. Porosity can reach 90%–96%, while air permeability is 500–1,000 L/(m²·s).

Compression recovery is at least 85%. Thermal conductivity is 0.032–0.038 W/(m·K), allowing the material to provide acoustic absorption together with cushioning and limited thermal control.

A typical 20 mm automotive grade installed directly against a surface provides an NRC of about 0.55–0.65. A high-end acoustic grade of the same thickness can reach about 0.70–0.85.

When a 50 mm air cavity is left behind a 20 mm high-end product, the NRC can increase to about 0.80–0.92. A 30 mm product combined with a 50 mm cavity can reach about 0.85–0.95.

These installation options are suitable for doors, front bulkheads, wheel cavities, and motor-noise-control structures with internal space behind the acoustic layer.

High-end products have a formaldehyde emission value of no more than 10 μg/(m²·h) and an odor grade of no more than 3.0. Conventional automotive grades have a formaldehyde emission value of no more than 15 μg/(m²·h) and an odor grade of no more than 3.5.

The material does not use solvent-based adhesives. FMVSS 302 or B1 flame-retardant options can be selected according to project requirements.

Jiangsu Haokai can adjust the microfine-fiber content, raw-felt weight, hot-pressing density, and finished thickness according to the target frequency, available cavity, component curvature, and installation limit.

PET Thermoformed Acoustic Felt can be processed by mold forming, steam molding, and precision die cutting into parts with holes, curves, clearance areas, and locally compressed zones.

A project can begin with material selection, samples, and trial validation before moving to small-batch production and volume preparation. Custom sample development normally takes 10–15 days.

The regular minimum order quantity is 1,000. Standard and custom products generally require 7–15 days for production. Finished goods receive 100% inspection before packing, and third-party inspection is accepted.