Volatile organic chemical emissions from structural insulated panel (SIP) materials and implications for indoor air quality Page: 7 of 30
30 pagesView a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
steady-state conditions (ASTM, 1997a). Losses of compounds due to factors other than
ventilation (e.g., as the result of net sink effects) were ignored. The steady-state form of the
mass-balance model for CSTRs was used:
ER= Q (C -Co) (1)
where Q is the chamber inlet gas flow rate (m3 h1); C is the air concentration of the compound in
the chamber (pg m-3); and Co is the concentration of the compound in a blank chamber run
(pg m-3).
Area-specific emission rates or emission factors (EFs) in mass per area-time (pg m-2 h~)
were calculated as:
EF = Q (C -Co) (2)
A
where A is the material's exposed surface area (m2).
Results
VOC Emissions from SIP Materials
The VOCs emitted by the two unfinished SIPs (SIP-A and SIP-B from manufacturers A and
B, respectively) were qualitatively similar (Table 3). The predominant compounds were acetic
acid, pentanal, hexanal, methyl acetate, toluene (SIP-A only), methyl acetate (SIP-A only),
styrene and n-pentane. Most of the VOCs emitted by SIP-B were attributable to OSB-B used in
its fabrication. The exceptions were styrene, isopropylbenzene, n-propylbenzene,
2-methylbutane and n-pentane, which derived from the polystyrene core.
Table 3 presents the VOC emission factors for the unfinished SIPs and SIP materials
measured at one and four months. In this and subsequent tables, the compounds were grouped
by chemical class and ordered by decreasing volatility within class. With the exception of
phenol emitted by SIP-B and OSB-B, the emission factors of all quantified compounds declined
over this period. Nevertheless, there still were substantial emissions of the predominant
compounds at the four-month time point. The temporal emission profiles of four selected VOCs,
acetic acid, acetaldehyde, hexanal and styrene, from the two unfinished SIPs and the SIP-B
components are plotted in Figures 1-4, respectively. The emissions of all four compounds from7
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Hodgson, Alfred T. Volatile organic chemical emissions from structural insulated panel (SIP) materials and implications for indoor air quality, report, September 1, 2003; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc739061/m1/7/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.