Table 1 Overview of test materials and preparation steps

# 1

Stone wool fibers without binder

Heat treatment at 590 °C for 20 min;

sieving to < 63 μm

Removed by heat treatment

# 2

Milled stone wool fibers without binder

Heat treatment at 590 °C for 20 min;

milling

Removed by heat treatment

# 3

Milled stone wool fibers sample with binder

Milling

PUF (3.5% (w/w))