Metaseal

General Info

PRODUCT DESCRIPTION
Metaseal is a non-staining, one-component, non-skinning butyl sealant.

USE
To achieve specified Sound Transmission Class values (STC) in drywall and plaster wall systems by sealing perimeter joints and opening in partitions and by bedding electrical outlets and switch boxes set in Acoustical panels. (Metaseal can also be used as a lap joint & perimeter sealant for polyethylene vapor barriers over fiberglass or other insulations.)

APPLICATION
Metaseal extrudes easily at normal working temperatures by hand or power gun and will adhere well to all clean concrete, gypsum, plaster, steel, wood and aluminum surfaces without priming. Metaseal is highly resilient and can therefore withstand any amount of movement normally encountered in partitions.

NOTE:

Always extrude a full 3/8″ bead into the joint. The sealant should be applied between track or runner, walls, floors and ceilings, as well as between panel edges, and contact surfaces, as illustrated. The number of beads required, will vary from two to four in most applications depending upon the designed (STC) value. Special problem areas may require a premolded lose-cell filler or additional sealant between track and drywall at tome and bottom edges, according to design specifications.

LIMITATIONS
Metaseal is designed strictly for interior use. It should not be applied at the sight-line, where dirt pick-up is likely except where molding or joint taping will conceal it. A non-skinnng sealant such as Metaseal cannot be painted over. For dress beads at sight-line or wherever painting-over is required, use Butylin, a skinning type butyl sealant, which can be painted over within 24 hours or less, as soon as skin forms.

PREPARATION
Joints and surfaces on which Metaseal is to be applied, must be clean, dry and free of dust or other foreign matter.

SUGGESTED SPECIFICATION
Metaseal, non-skinning butyl rubber sealant by Chemtron Manufacturing Ltd., of Calgary, Alberta, shall be used in drywall and plasterwall systems where noted on drawings, to seal openings between edges of walls and partitions and studs, ceiling and floor tracks, etc. and to bed wall-switches, outlets and similar fittings in panels to effectively block air-borne sound transmission.

TECHNICAL DATA
PROPERTIES

COLORS EXTRUDABILITY: White, Gray, Bronze and Black. (ASTM D2452-75) 2.8 sec. per ml. max 0.104 inch, orifice, 50 psi)
TOTAL SOLIDS CONTENT: (ASTM C681-73) 91% (by wt.)
VOLUME SHRINKAGE: (ASTM D2453-75) Less than 18% by volume (82% volume solids).
WEIGHT PER GALLON: (ASTM D1457-60) 14.1 lbs + or – 0.5 lbs.
COVERAGE RANGE: 1478 lineal ft. per gallon, at 1/8″ bead, 375 lineal ft. per gallon at 1/4″ bead, 165 lineal ft. per gallon at 3/8″ bead.
DRYING TIME: Non-skinning, remains permanently soft and tacky.
ENGAGE ABILITY: Sealant will easily engage and transfer to male joint at -10°F.
VEHICLE BLEEDOUT: No visible oxidation of vehicle from sealant after three weeks at 158°F (70°C) on painted or unpainted metal surfaces.
FLEXIBILITY: (ASTM C711-72) No Cracking or loss of adhesion at -60°F bent 180° over 1/4′ mandrel.
SERVICE TEMPERATURE LIMITS: Minus 40°F to 240°F
SAG: (ASTM D2202-73) Sealant will not sag more than 0.10″ when placed vertically in oven at 155° to 161°F for 1/2 hour. Meets (ASTM C639-69) for Type II Single-component Non-sagging Sealant.
STAINING: (ASTM D925-76 Method A) Sealant will not deteriorate a painted surface.
HEAT AGING: No loss of surface tack or adhesion.
WATER RESISTANCE Sealant will maintain adhesion to metal surface for 30 days at 120°F, submerged in water.
WEATHERABILITY: (ASTM D750-68) After 1,000 hours in weather-o-meter, no cracking, bleeding or loss of rubber characteristics.
CHEMICAL RESISTANCE: Excellent in water, ozone, water vapor, alcohols, fair to weak acids and bases. Poor to organic solvents.
STATIC WATER HEAD TEST: (MBMA ICE DAMMING): Sealant passes five (5) inches water head simulated test.
SAFETY: Wet flammability (ASTM D93-80) 125°F. Dry flammability – Combustible (450°F).
THRESHOLD LIMIT VALUE FOR SOLVENT: T.L.V. 200 ppm.

ADDITIONAL REQUIREMENTS

MEETS: Canadian specification CGSB 19-GP-21M. American Federal Specification TT-C-1796A, Type 1, Class A.
PACKAGING: Poly-tipped tubes not less than 29 fl. oz/tube; 12 tubes/carton. Weight/carton – 36 lbs. 5 gal. pails (1385 cu. in.) 76 lbs/pail.
FREIGHT CLASSIFICATION: Caulking Compound
SHELF LIFE: One year in sealed container
CLEAN UP: use either toluol (flammable) or methylene chloride (non-flammable) solvents.

FOR INDUSTRIAL USE ONLY

Selecting the right partition
Today’s up-tempo living has created an increasing demand for privacy and freedom from unwanted sound. What is music to a man on one side of a wall, may be nothing more than a throbbing nuisance to his neighbor unless careful consideration has been given in the planning stages of a building to the problem of tenant satisfaction.

Within the limits of background noise levels both inside and outside a building, and the price of the accommodation, tenant satisfaction can be obtained easily and economically by selecting the wall or partition best suited to the environmental conditions.

Sound Transmission Class (STC)For many years sound transmission losses were measured by averaging them at nine frequencies ranging from 125 to 4,000 cycles per second. It has become evident in recent years that this method does not properly assess the wide variety of light weight building systems now in use. For this reason, the use of Sound Transmissions Class has been adopted where possible as the standard for rating walls and partitions for modern day structures.The main difference between the old nine frequency average and the Sound Transmission Class is that the latter guards against weak points in the critical range of frequencies. To the user, it is immaterial that at some frequencies that at no frequency is it poorer than it needs to be.Tenant SatisfactionSelecting a sound transmission class range by the degree of tenant satisfaction required, calls for a reasonable estimate of the present and future background noise levels that will exist in the location being considered. This is necessary in order to select a partition that will reduce transmitted sound to a level lower than the background noise, thus effectively masking it. For example, if the background noise level is estimated to be 25 decibels, then a partition with an STC rating of 45 “db” will render inaudible noise up to a level of 70 “db” on the other side of the partition. (See noise level chart above).Note: Most humans cannot detect sound variations of 3 “db” or less.

TDS Sheets