EXPANDED ABS MAKES LIGHT-WEIGHT MANHOLE RINGS

MANHOLE RINGS AND LOCKING COVERS MOLDED OF EXPANDED ABS WEIGH JUST 25 LBS., AS AGAINST 350 TO 450 LBS. FOR THE TRADITIONAL CAST IRON UNITS THEY ARE REPLACING. IN ADDITION TO BEING LIGHTER, THE FOAM ABS UNITS ARE LESS BRITTLE, CANNOT RUST OR CORRODE, AND ARE UNAFFECTED BY NORMAL TEMPERATURE VARIATIONS OR ELECTROLYTIC ACTION. MOREOVER, THEY REPORTEDLY CAN BE DROPPED FROM EXCESSIVE HEIGHTS WITHOUT DAMAGE; WON'T CHIP, CRACK, OR DENT; WILL SUPPORT UP TO 97,500 LBS. ON A 24-INCH SURFACE DIAMETER; AND CAN BE CONVENIENTLY STACKED TO MINIMIZE STORAGE, HANDLING, AND TRANSPORTATION COSTS. THEY ARE PRICED AT ABOUT $25 COMPARED WITH COSTS RANGING FROM $35 TO $45 FOR CAST IRON.

• Publication Date: 1972-10

Media Info

• Pagination: p. 44
• Serial:
  • Modern Plastics
  • Volume: 49
  • Issue Number: 10
  • Publisher: McGraw-Hill, Incorporated

Subject/Index Terms

• TRT Terms: Brittleness; Cast iron; Corrosion resistance; Costs; Durability; Manholes; Plastics; Temperature; Weight
• Old TRIS Terms: Covering
• Subject Areas: Finance; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217255
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 8 1973 12:00AM