VWR Collection Laboratory Equipment - page 111

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HENGAR BOILING GRANULES
For Prevention of “Bumping” in Boiling Liquids
In any laboratory procedure involving the boiling of a liquid, inert and insoluble, Hengar Granules effectively
prevent super-heating with its attendant dangerous explosive vaporization commonly known as “bumping”.
A few Hengar Granules in any boiling liquid permit a steady copious stream of bubbles to escape without
this spasmodic splatter. Evaporation or distillation proceeds quietly and smoothly. Sharper fractions result.
Flask breakage is reduced and watching time is minimized. Froth is spread out evenly and does not climb
the neck of the flask. Especially useful in boiling soap solutions and evaporating ethereal extracts of fat.
With Hengar Granules in the vessel, any gases formed are extracted from the liquid quickly and completely.
Insoluble, Hengar Granules cannot contaminate the liquid. They remain at the bottom of the flask or beaker,
permitting the liquid to be readily poured off. After use, the granules are simply discarded. Hengar Granules
are also available with a pure selenium coating, for use in the Kjeldahl digestion and distillation method of
organic nitrogen determination.
Hengar Granules, Plain
High purity, white, amphoteric alundum granule. Extremely hard
porous surface. Will not crumble or “powder”. Four mesh granule
size. Specific gravity 3.97.
Description Quantity Per Package Cat. No.
136B Plain Granules 250g 51138-027
136C Plain Granules 500g 51138-049
Hengar Granules, Plain Micro
High purity, white amphoteric alundum granule. Extremely hard
porous surface. Will not crumble or “powder”. Ten mesh granule
size. Specific gravity 3.97. Description Quantity Per Package Cat. No.
136AA Plain Micro Granules 100g 53118-025
136CC Plain Micro Granules 500g 43300-302 Hengar Selenized Granules
High purity, amphoteric alundum, specially treated with selenium
for use in determination of amino and cyanide nitrogen. Four
mesh granule size, iridescent bluish black color. Selenium as a
solid is relatively nontoxic. Its vapor or fumes are highly toxic. TLV
0.2 mg/cubic meter. Specific gravity 4.10.
Description Quantity Per Package Cat. No.
132B Selenized Granules 250g 51137-046
132C Selenized Granules 500g 51137-068
Hengar Selenized Granules, Micro
High purity, amphoteric alundum, specially treated with selenium
for use in determination of amino and cyanide nitrogen. Ten mesh
granule size, iridescent bluish black color. Specific gravity 4.10. Description Quantity Per Package Cat. No.
132AA Selenized Micro Granules 100g 43300-300
132CC Selenized Micro Granules 500g 53117-069 Hengar Carborundum #12 Granules
Hard, bluish black, iridescent silicon carbide granule. No reduction
characteristics. Oxidizes slowly at 800°C (1472°F). Twelve mesh
granule size. Specific gravity 3.20.
Description Quantity Per Package Cat. No.
133A Carborundum #12 Granules 100g 43300-304
133B Carborundum #12 Granules 500g 43300-306