Mastic #1163 (smooth)


A durable, highly viscous material (thick), waterproof sealer/chalk. May be used over wood, brick, stone, concrete, aluminum galvanized or primed steel, asbestos, weathered asphalt roofing products, polystyrene and polyurethane foam. May be used as a general purpose sealer, chalk, or patching material around chimneys, vents, stacks, pipes, mechanical units, windows, door frames, or any other areas needing sealing or waterproofing. Fill cracks in concrete, block, stone, brick, walls (interior or exterior) or foundations. Coverage will be determined by application and therefore may vary with use and layers applied. Also has improved elasticity and elongation properties. ( By special order this product can be manufactured at a viscosity that will allow the material to be spray applied.)


Description                                                                                              ASTM Test #


Color                                   Off White

Low Temperature (0 deg.C) Flexibility

 =180 deg. Bend Over                                 1" mandrel                                                                Passed

                                                                          1/2" mandrel                                                           Passed

                                                                          1/4" mandrel                                                           Passed

                                                                          1/8" mandrel                                                           Passed

Tensile Strength (psi.)                                                                            D-2370                           306

Elongation - (% @ 25deg.F)                                                                   D-2370                           837

(% @ 75deg. F) 334

Viscosity (K.U.+ 10)                                                                                  D-562                             118

PH                                                                          80

Solids (by Weight)                                                                                    D-2832                          63.6

Solids (by Volume)                                                                                   D-2697                          57.4

Weight per Gallon ( + 0.2lbs)                                                                D-1475                            9.8

Film Hardness (Shore A)                                                                        D-2240                           77

Freeze / Thaw Stability -                                Cycles Passed                                                        5

Adhesion:                                                        180deg Peel-Instron Unit (A)

-Aluminum                                                     Excellent

-Wood (pine)                                                 Excellent

-Urethane Foam                                           Excellent

Modified Bitumen                                        Excellent

Water Vapor Permeance                                                                        D-1653/E-96                  2.8

(Perms=Grains/hr.ft.sqd.in.Hg.)

Water Vapor Transmission Rate                                                         D-1653/E-96                   1.19

(Grains/hr.ft. sqd)

Specific Permeability                                                                               D-1653                             0.24

(mg.mm./cm.sqd 24hr.)

120deg. Oven Stability - 1 week                                                             D-1849                         6.8/106

(PH/KU) - 2 week 6.7/109

Specific Gravity (g/cc @ 25deg C)                                                         D-1475                           1.18

Lead Content None

Mold/Mildew Resistance                                                                         D-3273                   Will Not support mold or mildew growth under normal conditions


Shelf Life Two + years in unopened containers

Service Temperature Range Excellent performance characteristics -20 deg. to 200 deg F


(A) Actual P.S.I. numbers available from the Technical Services Department, Alfieri - McBee Corporation if required.


NOTE: This data is based on information from laboratory tests which are believed to be accurate but all recommendations are made without warranty, since the conditions of use are beyond the Alfieri-McBee Corporation's control. The Company does not assume any liability or responsibility of the product relative to coverage, performance, or injury resulting from use. Liability, if any, is limited to replacement of products.


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