The beauty of open cell cellular glass thermal insulation, even for building applications

logo_smallThe EN-standard 13167 is rather clear about cellular glass for building applications. The water vapor diffusion resistance µ should be larger than 40000. This property has to be measured according to the standard EN 12086, which has its last version in 2013. The reason for this large µ-value is rather clear. Cellular glass has the reputation to eliminate perfectly internal condensation thanks to this very large µ-value.

However, there are two reasons to doubt and review the above story in the building , namely two practical ones and a bureaucratic one.

  1. WVTThe bureaucratic one is that the standard EN-12086 from 2013 contains an error on page11.  Indeed, the mentioned gas constant of water vapor is a factor 100 too small, which means that a cellular glass with a real µ-value of 400 is allowed by the (erroneous) standard. A µ-value = 400 is an open cell cellular glass. This means that today open cell cellular glass is covered by the EN13167 standard.
  2. imagesThe practical one is that an open cell cellular glass has an improved acoustical absorption with thermal conductivity 0.056 W/mK. This material can be used between two thin sound reflecting materials to obtain a light sandwich with a small sound transmission. Another application is simply to use it to reduce echo (reverberation) without using combustible material.
  3. Another use op open cell cellular glass can be find in the hydro-culture world, like already mentioned in a previous post. But I can imagine it makes also sense to let grow plants against this material vertically installed inside and outside. The material serves as plant growth medium, thermal insulation and acoustic absorb-er.

280px-Conformité_Européenne_(logo).svgIn our opinion, it is clear that the EN-standard 13167 should be rewritten to allow non-combustible (cellular glass) thermal insulation with a high compressive strength and interesting acoustic properties. We should simply specify a minimum µ-value and maybe even a maximum µ-value. Today, it seems hard to sell cellular glass thermal insulation with important acoustic absorption within the EN- standards system because only cellular glass with µ-value > 40000 is allowed for building applications.


1 thought on “The beauty of open cell cellular glass thermal insulation, even for building applications

  1. Pingback: Acoustic absorption with cellular glass | BELGLAS BVBA

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