COMPOSITION FOR MANUFACTURING PACKING SHEET MATERIAL Russian patent published in 1997 - IPC

FIELD: manufacture of gaskets for sealing internal combustion engine joints. SUBSTANCE: claimed composition comprises (wt parts): 100 synthetic copolymeric diene rubber latex (dry matter) which comprises, wt.pts: sulfur, 6.6-22.0; vulcanization accelerator, 0.6-3.0; zinc oxide, 38.0-60.0; powdery mineral filler, 100-500; fibrous filler, 800-1000; carbon-containing filler, 50-150; 15-20% aqueous suspension of loose components is first prepared in mixer. Fibrous filler is ground in water to grinding degree of 25-55^°. Suspension and latex diluted to concentration of 5-10% are poured out. The suspension is further stirred and diluted to 2-10% concentration, and then diluted to 3% concentration, one layer of perforated sheet iron is coated with 0.2-0.7 mm thick cast sheet material on both sides. The final material is vulcanized and coated according to well known technology. Characteristics of the material: compressibility at 35 MPa is 13.9-17.3%, reproducibility after releasing pressure at 35 MPa is 58.2- 62.3% compressibility at 35 MPa after maintaining in liquid at 150 C for 5 h is 14.0-16.9%. EFFECT: improved properties of the composition. 2 tbl