Product 4250
Micanite II Reconstituted Mica Paper

Therefore, a new type of micaceous insulation has been developed utilizing a unique product processing technique to produce a product with the:

• uniformity and electrical properties of reconstituted mica paper

• high corona resistance and physical properties of mica splitting products.

Chart No. 1 illustrates this particle size comparison.

DESCRIPTION:

Advantages of Micanite II mica paper over mica splittings:

1.	Excellent caliper uniformity ­ mica splitting products have a wide variation in thicknesses which increases as the caliper decreases.
2.	Few internal voids ­ the resin has a shorter path to following during impregnation.
3.	Better conformability ­ there is a less tendency to fracture when formed around sharp bends.

Advantages of Micanite II mica paper over ordinary mica paper:

1.	Mica content ­ larger percentage of mica in vacuum pressure impregnated wrapped bars. Reconstituted mica paper accepts or absorbs a much higher percentage of the impregnating resin.
2.	Higher tensile strength ­ the high cohesive forces of the large flake material enables this product to provide a higher tensile strength than when smaller platelets are employed.
3.	Cut though ­ an important physical property for high voltage electrical insulation is cut-through resistance. The graph shown below depicts the cut-through for mica splittings, large flake "Micanite II" and reconstituted mica paper. Micanite II large flake micaceous insulation more closely approximates the cut-through resistance of mica splittings and is clearly much better than ordinary reconstituted mica paper.
4.	Dielectric strength ­ before, as well as after resin impregnation, the dielectric strength of Micanite II is higher than the other micaceous materials tested.

Physical Properties of Micanite 4250 Mica paper

Thickness Base Weight Penetration Tensile Mils MM GM/Sq. Ft. GM/x2 Time Strength Min. Max. Min. Max. Min. Max. Min. Max. Sec. LB./IN. KG/CM 2.90 3.80 0.074 0.096 12.1 14.1 130 152 Max. 30 5 .89 4.40 6.20 0.112 0.157 19.0 24.0 204 256 Max. 40 5 .89 5.0 7.0 0.127 0.178 22.3 24.6 214 265 Max. 40 5 .89

NOTE: The values shown above are averages based on several determinations and should not be used for specification purposes.

1.	Thickness measured in accordance with ASTM D 202 Par. 20 method D using motorized gauge.
2.	Electrical strength measured in accordance with ASTM D140 1/4" electrodes, short time.
3.	Average base weight determined by method outlined in ASTM D 1677 except specimens dried in 105°C oven one hour before weighing and measured within three minutes from removal.
4.	Penetration time determined by method outlined in ASTM D 202 except mica contacted on coarse side with a solution composed of 40 parts toluene and 60 parts cold pressed castor oil adjusted to a specific gravity of 0.917 ± .001 at 77 F (25°C). Samples preconditioned one hour at 220° F (105° C) before testing. 3 mils and 4 mils Samica 4200 paper are only available in a soft (S), and a hard (H) penetration range.
5.	Tensile strength determined in accordance with ASTM D 1677 except 3" span and 0.20 in./min. travel.
6.	Moisture content of all thicknesses measured per ASTM D 202 immediately after removal from protective polyethylene bag, is less than 1.0% by weight.

Roll Specifications:

1.	Paper free of breaks and splices
2.	Weight 65-lbs. minimum, 90-lbs. nominal, and 110-lbs. maximum.
3.	Available in 38" and 40" widths.
4.	Cores marked with roll number only.
5.	All cores 431/4" long.
6.	Product supplied on 8" diameter cores.
7.	Maximum telescoping 3/8" over paper width.
8.	Carton label contains product identification, roll number, weight, length, average penetration, average tensile, and nominal thickness.