Tests conducted by an independent
accredited laboratory show that
DuPont’s Tyvek L1431N fabric has a
high barrier performance that
provides excellent protection against
liquid permeation.

To assess the barrier performance,
permeation tests (according to EN
ISO 6529 – Method A) were
conducted to determine breakthrough
times of commonly used chemicals
with Tyvek, MPF (Microporous
Film) and SMS (Spunbond-
Meltblown-Spunbond), materials
frequently used for type 4, 5 and 6
single-use chemical clothing.

To conduct the permeation test,
40% sodium hydroxide and 18%
sulphuric acid were used. With a
breakthrough time of over 480min
with two water-based inorganic
chemicals, Tyvek offered a higher
barrier than the Microporous film,
while SMS showed immediate
breakthrough. Penetration tests
showed virtually no difference
between the materials after 1min of
exposure. When tested according to
EN ISO 6529 – Method A, it was
found that Tyvek offers protection of
up to 8h.