existing alkaline leaching technology include nil to low sodium sulphide addition, low polysulphides
, low sulphate bleed, and low gold dissolution from the concentrate.
Some of technological aspects, like development of host matrices, interactions of host matrix with polysulphides
and interactions between sulphur and electrolyte have been successfully developed within Eurolis project.
The core components of its products are high-performance polysulphides
and fast-curing epoxy mortars.
Commonly window manufacturers use butyls as primary sealants, and polysulphides
, polyurethanes and silicones as secondary sealants.
Although they were able to demonstrate qualities of radiopacity equal to that of the polysulphides
, there were associated physical property drawbacks including hydrogen bubble formation in dies poured from the impressions, and evidence of long term breakdown limiting the shelf life.
In fact, according to Watson & Cruz-Rivera (2003), algae may contain a wide range of bactericidal agents, including amino acids, terpenoids, phlorotannins, acrylic acid, phenolic compounds, steroids, haloge-nated ketones, alkanes, cyclic polysulphides
and fatty acids.
from Petiveria alliacea L.
The forms of sulphur believed to be reducible under test conditions are (1) sulphide (released by the acid, not actually reduced), (2) elemental sulphur, (3) thiosulphate, (4) other polythionates or polysulphides
and (5) sulphite, sulphate are excluded.
No zerovalent sulphur, such as polysulphides
and/or elemental sulphur, was reported.
Initial trials were conducted with the following herbals: ginger, kalajeera, Asafoetida (Hing) and garlic rich in polysulphides
and/or selenium), katha with polyphenols, and alkaloids of Vayuvidanga (Embelia ribes) and Chitramoolam (Plumbago zeylanica) and Tankanam (Borax).
Poorly defined CSUT(1) High 9-10 Complex Alkaline polysulphides
High 8-9 Poorly defined Biocatalysed bisulphide Poorly defined 8-10(?
Benzoflex 400 polypropylene glycol dibenzoate used in flexible PVC, acrylics, nitrite rubber, polysulphides
and polyvinyl acetate.