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LaSeal 283 Fire rated Acrylic Sealant

Fireproof sealant

LaSeal 283 Fire rated Acrylic Sealant

LaSeal 283 Acrylic FireStop Sealant is a single component, non sag, fire rated acrylic based sealant, A high performance acrylic sealant for construction joints, and the sealing of service penetration in plasterboard, concrete and masonry wall construction. When cured, KASTAR283 provides an elastic, flexible seal which prevents the passage of fire and smoke. Fire caulk sealant is also an effective acoustic sealant.

Color:White, Black, Gray

Packing information: 280ml, 300ml, 310ml by plastic cartridge; 600ml sausages, 190 KGS by drum.


    ● Paintable and water based
    ● Exterior or interior use
    ● Fireproof up to 4 hours
    ● Water based one component and easy to use
    ● Excellent sealing performance, smoke blocking
    ● Excellent fire resistance capacity
    ● No smell & Non-Toxic
    ● Filling Joints up to 50mm


    ● Sealing exterior and interior construction joints & expansion joints
    ● Excellent for caulking around concrete panels, block work, brickworks, gaps around cables, metal pipes, conduits, busways and ducts that penetrate walls, floors and ceilings.
    ● Sealing joints in plasterboard technology and fire rated system.
    ● Small plaster repairs before painting.
    ● Sealing around window and door frames.
    ● Sealing of aerated concrete.
    ● Sealing joints or penetrations requiring to 4 hours fire rating.
    ● Sealing joints in pre-cast panels.
    ● To prevent the spread of fire and smoke through walls and floors.
    ● Perimeter sealing of doors and window framing.

    Fireproof acrylic sealant 283 (2)kfl Fireproof acrylic sealant 283 (1)iya

    Technical Data Sheet(TDS)

    Technology data:The following data are only for reference purpose, not intended for use in preparing specification.
    LaSeal 283 Fire rated Acrylic Sealant



    Basic material

    Synthetic Latex Emulsion





    Application Consistency

    Brush, Trowel, Caulking Gun, or Power Extrusion

    Average Nonvolatile(FSTM 9A)

    55% BY VALUME (69% BY WEIGHT)


    Softbutterygelwithatypicalviscosityrange of 130.000-160.000cps

    Temperature Resistance

    -20℃to 110℃

    Service Temperature limits

    -7℃to 93℃

    Storage Temperature

    5℃ to 35℃

    Application Temperature

    5℃ to 50℃

    Skin Drying Time(mins)






    Elongation at break(%)


    Elongation at break after immersion (%)


    Curing rate(2mm/h)


    Consistency (cm)


    Solid content (%)
    Shelf life

    24 months


    Storage in cool and dry place at room temperature


    ● Not suitable for freezing or damp, silicone oil-containing base surface and silicone rubber.
    ● The surface of the substrate to be adhered must be clean and dry, free of dust, oil and water stains. Adhesive substrate should be used for cleaning with cleaning agent. Otherwise, it may cause bonding failure.
    ● Temperature and humidity have a great impact on the surface for drying and curing of the sealant, and the construction environment is recommended Temperature 5~35℃, humidity 50~70%RH.
    ● The node part can be modified and smoothed with a scraper or rigid foam strip, and the ground is partially modified.It can be smoothed with soapy water.
    ● For construction methods, please refer to the construction instructions or consult our technicians.

    Surface Preparation

    ● Following cleaning procedure and materials are recommended
    ● Glass Degrease with alcohol or MEK
    ● Aluminium, light alloys and stainless steel Degrease with alcohol or MEK
    ● Other Metals Lightly abrade then degrease as above
    ● Wood Lightly abrade surface then remove dust
    ● Plastics Degrease using an agent recommended by plastics manufacturer
    ● Concrete and other alkaline Surfaces Brush and remove dust


    ● Surface must be dry, clean and free from dirt oils, stains or other surface contaminants.
    ● Remove all loose materials.
    ● Always use a standard caulking gun to dispense the sealant.
    ● Caution: The use of a caulking gun is critical and highly recommended to ensure best finish and faster application.
    ● Ensure that sealant is in contact with both sides of joints and gaps. Use foam backer rods as necessary.
    ● Remove excess sealant and smooth it off with a flat knife. Applied sealant is touch dry after 30 mins. Protect from water exposure for at least 4 hours after application. Can be painted over after 2 hours.

    Storage and shelf life

    1. They should be protected from water, frost and adverse air conditions.
    2. They should be kept dry and cool on wooden pallets at between +5 degree C and +25 degree C in moisture free conditions.
    3. The opened products should be consumed immediately.
    4. Shelf life is maximum 24 months conditional to complying with the aforementioned storage conditions.