Cementitious composition

• US 2,853,394 A
• Filed: 03/30/1953
• Issued: 09/23/1958
• Est. Priority Date: 03/30/1953
• Status: Expired due to Term

• Current Assignee: George B. Kirk, Wallace C. Riddell
• Original Assignee: George B. Kirk, Wallace C. Riddell
• Inventors: Riddell, Wallace C., Kirk, George B.
• Application Number:
  US03/345,714
• Time in Patent Office: 2,003 Days
• US Class Current: 106/675
• CPC Class Codes: C04B 14/185 expanded
• CPC Class Codes: C04B 14/202 Vermiculite
• CPC Class Codes: C04B 14/42 Glass
• CPC Class Codes: C04B 2111/28 Fire resistance, i.e. materials resistant to accidental fires or high temperatures
• CPC Class Codes: C04B 24/18 Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
• CPC Class Codes: C04B 24/383 Cellulose or derivatives thereof
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: Y10T 428/249932 Fiber embedded in a layer derived from a water-settable material [e.g., cement, gypsum, etc.]

Claims

1. A SET, DENSE CEMENTITIOUS COMPOSITION CHARACTERIZED BY A FIRE-RESISTANCE RATING OF AT LEAST 60 MINUTES WHICH CONSISTS ESSENTIALLY OF A SET MASS OF INTERLACED GYPSUM CRYSTALS AND IN INTIMATE ADMXTURE THEREWITH FROM 1% TO 5% EXPANDE PERLITE HAVING A BULK DENSITY OF FROM 5 TO 15 LBS. PER CUBIC FOOT AND OF PARTICLE SIZE SUBSTANTIALLY ENTIERELY LESS THAN 2.38 MM. DIAMETER AND OF AT LEAST 149 MICRONS DIAMETER, FROM 0.2% RO 0.5% OF VITEROUS CERAMIC FIBERS HAVING A LENGTH OF FRO, 0.5 TO 3.0 INCH AND AN AVERAGE DIAMETER OF FROM 0.00015 TO 0.0006 INCH, SAID COMPOSITION NOT OVER 0.5% ORGANIC FIBROUS MATERIAL.