For over 50 years we have worked on quantifying the level of comfort associated with our foams in all the sectors in which we operate, converting conceptual data into facts. Our R&D department assesses and measures thermal comfort in order to be able to express it in numbers, not just words. We work at Zahonero as comfort engineers.

GLOBALTHINKING

The great experience providing tailored solutions around the globe has granted us with the knowledge
to understand the different needs in various geographic markets.

How thermal comfort is measured:

According to the SATRA STM 511 standard (equivalent to ASTM F1868-02; and ISO 11092: 1993)

Breathaprene vs non breathable polychloroprene

Thermal comfort (or the water vapor permeability index) is the result of the ratio between thermal resistance Rct (m2K / W) and water vapor resistance Ret (m Pa / W).
Our Breathaprene foams guarantee an extraordinary degree of water vapor breathability and very high thermal resistance values, the result of which is an appreciable increase in thermal comfort.

Thermal comfort
(water vapor
permeability index)

=

Thermal resistance

Water vapor resistance

Ret<6m2Pa / W

Very breathable

Ret<12m2Pa / W

Good breathability

Ret<20m2Pa / W

Breathable

Ret=20m2Pa / W

Breathability limit

What is termal comfort

Non breathable polychloroprene and polyolefin foams are extremely versatile materials with inherent thermal properties and the ability to contour to the body, providing compressive support. However, they are closed cell materials, which results in limited use due to the rapid accumulation of heat and sweat, with consequent discomfort for the user.
Attempts to improve the breathability of these closed- cell materials through micro-perforations have not
yielded significant results, and the size and formation of the holes significantly reduce the value of the insulation, causing changes in the compressive and elastic qualities of the material.
The following table shows the results of a water vapor resistance test carried out with three samples of the same thickness (Breathaprene Natur, Non breathable polychloroprene and Polyolefin Foam), according to SATRA regulations.

THERMAL COMFORT EVALUATION
SATRA STM 511 (equivalent to EN 31092: 1993 and ISO 11092: 1993)

Reference

Water vapor resistance (m² Pa/W)

Thermal resistance (m² K/W)

Index

Breathaprene Natur

19.52

0.0674

0.24

Non breathable polychloroprene

385.23

0.0720

0.01

Polyolefin foams

392.44

0.0787

0.01

Study performed by Aitex

Study performed by Aitex

Breathaprene allows higher levels of water vapor permeability with the same thermal resistance capacity, resulting in superior thermal comfort.

Reference

Water vapor resistance
(m² Pa/W)

Elongation
(%)

Tensile Strength
(kPa)

Dimensional Stability
(△%)

Compression-set
(50%; 70ºC; 22h)

Breathaprene Natur

19.52

257

7000

0.1

1.5

Breathaprene Free

19.87

165

6500

0.5

3.0

Breathaprene Free Recycled

23.32

160

6500

0.5

5.0

Non breathable polychloroprene

385.23

250

10000

1.0

30.0

Polyolefin foams

392.44

80

4000

5.0

35.0

COMPARATIVE CHART
PolymerBreathableProtein Free
(Not Allergies)
RecyclingCome
from Oil
Carbon
Foot Print
Average price
per Kg Dry ($)
Breathaprene NaturBIOLOW$
B. FreeOILHIGH$
B. Free RecycledOILHIGH$
NeopreneMineral/OilHIGH$$$
Natural Latex (Desprotein)BIOLOW$$
YulexBIOHIGH$$$
PolyisopreneOILHIGH$$$
PolyurethaneOILHIGH$$
Breathaprene allows higher levels of water vapor permeability with the same thermal resistance capacity, resulting in superior thermal comfort.