Purchase Description 1546 vs 2 6 Jan 2020.pdf

Purchase Description #1546(2)

JMPB-PMD January 6, 2020

ITEM: Powdered charcoal to AA 59138 Class D 25 September 1998

SCOPE: This purchase description covers the requirements for 6000 pounds ground powered charcoal made from American hardwood lump charcoal. The Charcoal should specifically have a low ash content as defined below and be free of any contamination. The material is to be ground and packaged sealed bags within in paper sacks, 20 pounds maximum or fiber drums 50 pounds maximum.

SPECIFICATIONS of Raw material prior to grinding:

a. This charcoal made from of American hardwood.

b. The characteristics are defined as Type 1 lump in AA-59813 dated 3 June 2008.

c. The charcoal shall contain no more than 4% ash when tested in accordance to ASTM

D1762-84.

d. The charcoal shall contain no more than 5% moisture when tested in accordance to

ASTM D1762-84.

e. The volatiles matter shall be in the range of 10 min and 15% max, when tested in accordance to ASTM D1762-84.

Note, Dust or fines generated in the manufacture of charcoal are not to be used as a feed stock for grinding as this material has an unacceptable high ash content.

SPECIFICATIONS AA 59138 Class D of powder to be manufactured

This Charcoal is to be ground and screened to insure the following granulation requirements.

Charcoal sieve size Requirements % Passing 60 mesh (250 microns) 98 140 mesh (106 microns) 901

325 mesh (45 microns) Range 50 min and 80 max

1) Note, the 90% passing 140 mesh is an exception to the specifications which originally specified 80% passing 140 mesh.

The chemical properties should be governed by those of lump charcoal feed stock used.

Grinding should not result in any significant change of purity by contamination.

Specifically the Ash content shall remain below 5% and the moisture content shall be less than 5%.

INSPECTION/ACCEPTANCE: Final acceptance of charcoal will be at Pine Bluff Arsenal. The contractor will need to demonstrate the specifications can be met.