Attachment 1_Revised.pdf

ATTACHMENT 1

DESCRIPTION:

MAGNETIC SHIELDING, TUNGSTEN IMPREGNATED POLYMER

24" X 12" X 0.75"; MAY BE ≥ 0.75” THICK BUT MUST BE ≤ 1.0”

QUANTITY: 120 PIECES

CAPABLE OF ADHERING TO ONE ANOTHER EXTENDING OUT FROM A VERTICAL PLANE. LAYERS MUST BE

ABLE TO ADHERE TO EACH OTHER AT ANY LOCATION.

COLOR MUST BE NON‐YELLOW AND HIGH CONTRAST TO TUNGSTEN MATERIAL FOR LABELING

PURPOSES

TECHNICAL SPECIFICATIONS:

A. Fabricated in accordance with the materials and instructions listed below. Drawing width, length, and thickness dimensions are in inches and tungsten shielding density in grams per cubic centimeter.

B. Materials: see Tables 1 and 2

C. Each tungsten sheet shall be magnetized on each 12” x 24” surface such that sheets can be installed next to one another in multiple layers to continuously cover large areas. Minimum magnet strength will be capable of supporting at least 3 full sheets on carbon steel vertical surface.

TABLE 1

MATERIAL DESCRIPTION

ITEM

No.

DESCRIPTION SPEC

Tungsten shielding; homogenous matrix of tungsten powder and silicon rubber. Must provide uniform shielding throughout.

See Table 2

TABLE 2

TUNGSTEN SHIELDING ATTRIBUTES

ATTRIBUTE VALUE

1 HEAT RESISTANCE MIN 300°F CONTINUOUS, NON DELETERIOUS EFFECTS

2 BRITTLE TEMPERATURE 0°F MAXIMUM

3 TENSILE STRENGTH MIN 450 PSI PER ASTM D412

4 TEAR STRENGTH MIN 50 LBS/IN PER ASTM D624, DIE B

5 MAGNETIC STRENGTH

MINIMUM MAGNET STRENGTH WILL BE CAPABLE OF

SUPPORTING AT LEAST 3 FULL SHEETS EXTENDING FROM A

CARBON STEEL VERTICAL SURFACE.

6 THICKNESS

0.75‐1.0 INCHES; MUST ACHIEVE A CO‐60 ATTENUATION OF AT

LEAST 56% PER PIECE

7 DENSITY MINIMUM 7.2 GRAMS PER CUBIC CENTIMETER

8 TENTH VALUE THICKNESS (TVL) 2.5 ± 0.4 INCHES WITH A CO‐60 SOURCE