Flamemaster CS 3202B Optical Sealant - MIL-S-11031

CS 3202 is a thixotropic, curing type, adhesive sealing compound suitable for use by injection in bonding metal to glass in optical instruments or fire control instruments.

CS 3202 is a two-part, polysulfide base compound which cures at room temperature to a flexible, resilient rubber with excellent adhesion to aluminum, magnesium, titanium, steel and glass. Mixed CS 3202 is a thixotropic paste which is easily applied with an extrusion gun or spatula, but will not flow from vertical or overhead surfaces. The cured sealant is resistant to aircraft fuels, lubricants, oils water and weather and remains flexible at low temperatures.

Approvals:

• MIL-S-11031
• A-A-59293

NSN: 8030-00-275-8110

Application properties
-Color Base compound: black
-Color Curing agent: red-brown
-Mixed color: black
-Viscosity spindle # 7 - 2 RPM: 11,000 poises

Mixing ratio:
-Weight 100 : 10
-Volume 100 : 6.5

Application time (life): 3 hours

Tack free time: 16 hours

Time to 30 REX hardness: 48 hours

Vertical flow (slump): < 0.15"

Non volatile content: (min) 98 %

Cured properties
-Water vapor permeability: .005 gms. /hr.
-Specific gravity: 1.45
-Hardness Shore A: 45
-Tensile strength: 300 psi
-Elongation: 450 %
-Low temperature flexibility: -65 F
-Fungus resistance: Non-nutrient
-Corrosion resistance: excellent

Fluid resistance
-MIL-S-3136 type III fuel: excellent
-Water: excellent
-Alcohol: excellent
-Petroleum oil: excellent
-Synthetic oil: excellent

Adhesion minimum 45 lbs./inch
Aluminum	SS steel	Steel
Magnesium	Tin	Copper
Glass	Polyester	Carbon fiber
Nylon	Chromate	Epoxy primer
Water borne primers		Repairability

Radiation resistance: (Gamma) 3 X 107 Roentgens less than 25% change in tensile and elongation.

Standard conditions 770 F and 50% RH apply unless noted for a specific test

SURFACE PREPARATION

To obtain good adhesion, remove all traces of oil, wax, grease, dirt, or other contamination. This is done by wiping with a clean oil free solvent. Clean only small areas at one time and wipe dry with a clean cloth before the solvent evaporates. Maintain a clean solvent supply.

MIXING INSTRUCTIONS

When mixing pre-packaged kits, the entire contents of base compound (Part A) and curing agent (Part B) should be used. For small quantities, mix 100 parts by weight of Part A to 10 parts by weight of Part B. Part A and Part B are carefully matched in production for optimum performance characteristics. Care should be taken to assure that the Part B packaged with a given Part A isn't separated and used with a different Part A. The lip of the base compound container should be removed to facilitate mixing. Next, stir Part B in its original container until it is homogenous. Add Part B to Part A and mix thoroughly seven to ten minutes or until uniform in color. Scrape sides and bottom of the container to assure a complete mix. CS 3202 may be mixed by hand or with a mechanical mixer. When using a mechanical mixer, use low speeds since high speeds will generate heat and reduce application life.

APPLICATION

CS 3202 may be applied with a pressure gun or a spatula within the specified application life. Specified application lives are based on the standard conditions of 77 deg F and 50% relative humidity. For every 10 deg F rise, the application life is reduced by one half; for every 10 deg F drop, it is doubled.

CURE

The cure period is dependent on the application life, temperature, and relative humidity. Increased temperature and increased relative humidity will speed cure. Reduced temperature and reduced relative humidity will slow cure. Cure may be accelerated by heating up to 120 deg. F.