Self-flashing seal

An environmentally friendly commercial roofing system has been commercially developed by West Development Group [67]. The roof comprises a soy-based spray polyurethane (PU) foam with a sprayable solvent-free silicone top coat containing recycled EPDM granules forming a water-resistant, seamless, self-flashing seal. 

Self-flammable lead powder can be made by heating certain organic salts alone if care is taken to exclude air. Michael Faraday (1791 — 1867), in a delightful little volume of lectures, describes the lead pyrophorus made by heating dry tartrate of lead in a glass tube closed at one end and drawn to a fine point at the other and then sealed. On breaking the point and shaking out the powder, he demonstrated to his juvenile auditory how the finely divided lead burned with a red flash. 

Sample introduction for liquids on packed columns is often accomplished with a microsyringe through a self-sealing silicone septum as shown in Figure 5.8. In this figure, the coltunn is lined up colinearly with the syringe needle providing for either of two possible injection modes on-column or flash vaporization. 

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