These Specification Brushes are used with the Gardco Washability Machine, and are available either in black nylon or black hog bristles.
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Features
Hog bristles are selected as nearly as possible to be equivalent to the specified nylon.
They are in a 5x4 wide staggered 13 row or 5 wide straight 12 row pattern (ASTM D2486 calls for nylon 5x4x13 rows)
The hog brush bristles are secured in a PVC block 3.5" long, 1.5" wide and 0.5" thick, and are uniformly trimmed to a length of 0.75"
The nylon brush bristles are 6/6 grade, 0.012" in diameter with a bristle weight in each brush of 5/8 ± 10% ounces
Total brush weight is 2.5 ounces which is 1.5 ounces lighter than current metal-backed brushes. To compensate for this difference a 1/16 inch thick stainless steel plate is furnished with each new brush that may be inserted in the brush box above the brush.
After a long period of use bristles will wear down below the original length of 3/4". Brush bristles should be periodically measured and if they reach a shortened length of 5/8", we suggest they be disposed of. The shorter the bristle, the firmer it is. The firmer the bristle, the more harsh the performance.