Powerbase VOC is a chemical resistant barrier membrane material specifically developed to protect the building envelope and occupants from volatile organic compounds (VOC), hydrocarbons and toxic industrial chemicals.
Powerbase VOC is a composite multilayer material with a demonstrable barrier performance to a wide range of polar and non-polar chemicals. It is tested to ISO 15105-2 standards, is CE certified and conforms to EN14414 and EN14415.
Environmental risk assessments require soil analyses to identify concentrations of harmful gases and VOCs. The integrity of any risk assessment therefore relies on the barrier membrane’s permeation rates so that accurate predictions can be made of the migration of soil contaminants through the membrane.
The effectiveness of a protective membrane as a barrier is essential when evaluating a membrane’s suitability for a given application or type of contamination. Many ‘hydrocarbon resistant’ membranes are merely HDPE or other homogenous polymers. Such membranes have a narrow spectrum of chemical resistance and are poor barriers to VOCs and hydrocarbons. Furthermore, the vagueness of the word ‘hydrocarbon’ can lead to false claims that a barrier good for one hydrocarbon (e.g. Methane) is automatically good for a different hydrocarbon (e.g. Benzene).
A barrier membrane’s performance is therefore determined by measuring the permeation rate for each harmful chemical. The slower the permeation rate, the better the barrier performance. The following chart shows that Powerbase VOC clearly outperforms HDPE on a like-for-like basis.
Powerbase VOC Risk Assessment Modeller app
The unique Powerbase VOC Risk Assessment Modeller app is an essential tool that calculates permeation rates using site-specific soil analysis ground report data. By simply inputting the relevant concentration figures from the contaminated land report and entering the site specific variables including soil type, ground moisture and soil temperature, the app calculates the permeation rate for each toxic chemical for the project’s risk assessment.
Its chemical database includes all the harmful soil contaminants required by current legislation and detailed in CIRIA C748 Guidance on the use of plastic membranes as VOC vapour barriers.