Juniper Industries, Inc.
 
JUNIPER WATERTIGHT CLOSURES
 

THE CHALK TEST OF GASKET INTEGRITY



THE CHALK TEST IS A SIMPLE MEANS OF DETERMINING IF THE GASKET IS IN CONTINUOUS CONTACT WITH THE KNIFE EDGE WHEN A CLOSURE IS DOGGED.  A SUCCESSFUL CHALK TEST DOES NOT GUARANTEE THAT A CLOSURE IS WATERTIGHT, BUT IF THE GASKET IS IN GOOD CONDITION AND THE DOGS ARE PROPERLY ADJUSTED, IT DOES PROVIDE A REASONABLE ASSURANCE OF WATERTIGHT INTEGRITY.


TESTING IN SIX EASY STEPS
  1. CLEAN THE KNIFE EDGE.

  2. CLEAN THE GASKET.

  3. RUB CHALK ON THE KNIFE EDGE.

  4. CLOSE AND DOG THE CLOSURE TIGHTLY.  THE GASKET SHOULD BE COMPRESSED 1/8".

  5. WHILE THE CLOSURE IS DOGGED DOWN, CHECK FOR ANY LOOSE DOGS.  IF ANY DOG IS LOOSE, YOU MUST ADJUST IT AND REPEAT THE CHALK TEST.

  6. OPEN THE CLOSURE AND OBSERVE THE IMPRINT OF CHALK ON THE GASKET.  THE CHALK IMPRINT SHOULD BE IN THE CENTER THREE-FIFTHS OF THE EXPOSED GASKET AREA.  IF THE CHALK LINE IS NOT CONTINUOUS, THE CLOSURE IS NOT WATERTIGHT AND REQUIRES FURTHER ADJUSTMENT OR REPAIR.  IF THE CHALK IMPRINT HAS A GAP NEAR A DOG IT MAY MEAN THE DOG IS LOOSE OR OUT OF ADJUSTMENT.  HOWEVER, IT MAY ALSO INDICATE THAT THE OPPOSITE DOG IS TOO TIGHT, CAUSING A "BIND" IN THE CLOSURE.

 
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