Penetration number

ASTM D 217. Standard test temperature is 25°C (77°F). The higher the penetration number, the softer the grease. Undisturbed penetration is the penetration of a... 

In addition to thermal diffusi vity, the thermal penetration number is of considerable practical... 

If the thermal penetration number is known, the contact temperature Tc, which results when two bodies A and B, which are at different temperatures, touch, can easily be computed using... 

Type of pol5mer Temperature Type of irradiation source Dose Chemistry, crystalhnity, density, branching structure Mobility of chains and reaction rates increase with temperature Type of grafting/crosslinking reaction possible, depth of cure penetration Number of reaction sites increases with dose... 

Penetration number n. Figure used, chiefly for bituminous type products, as a measure... 

Penetrometer ipe-n9- tra-m9-t9r [L pene-trare + ISV -meter] (1905) n. Apparatus for measuring penetration number of a solid (ASTM, www.astm.org). 

Penetration. Penetration is an indicator of a grease s relative hardness or softness and not a criterion of quality. Measured on a penetrometer at 77°F (25°C), it is the depth of penetration (in tenths of mihimeters) into the grease of a standard 150-g cone. The softer the grease, the greater the penetration number will be. 

The penetration number, dropping point, metallic base, and the thickening agents used are ah elements that are used to grade grease. 

Penetration Number n Figure used, chiefly for bituminous type products, as a measure of their softness. It is obtained by allowing a weighted needle of specified dimensions to penetrate into the material under test, at a definite temperature. The penetration figure is usually recorded as the number of units of depth which the needle penetrates in a given time. (Asphalt science and technology. Usmani AM (ed). Marcel Dekker, New York, 1997)... 

Penetration Number, Value, Index or Yield Value... 

Penetration number with respect to a lubricating grease is the depth (in tenths of an mm) that a cone of standard dimensions penetrates vertically into the sam )le under test, under prescribed conditions of weight (150 g), temperature (25 C) and time (5 seconds). 

How does the presence of air voids in the sample affect penetration number What will be the effect if the movement of holder shaft is not friclionless ... 

Enumerate the important factors on which the penetration number of a... 

The cone will penetrate to a greater depth and thus the observed penetration number of the sample will be higher. 

The cone will not fall freely and so the test will show lower penetration number. 

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