KASTAR 978 Fire resistant MS polymer sealant

High initial adhesion and high strength

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KASTAR 978 Fire Retardant MS Polymer Sealant is a one-component moisture-solid MS Polymer Based Sealant, which has excellent flame retardant and adhesive sealing performance, no corrosion to the substrate, No pollution, no pollution to the environment, and good adhesion to metal, glass, and other substrates.


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Chemical BaseMS Polymer
Curing SystemMoisture
Density1.5 ± 0.1 gr/ml
Appearance/ColorPaste, Black
Skin Dry time40 min (23°C and %50 R.H.)
Speed of Squeeze500g/min GB/T 13477.4
Hardness Shore A40
Elongation at break260
Tensile strength2.2 N/mm2
Smoking Density80
Flame-retardant gradeV-0
Temperature Work-40°C and +90°C

Product features

MS Firerated is non-hazardous, will not emit halogenated by products under fire conditions and contains no raw materials known to have an oestrogenic effect on the environment. The sealant offers excellent levels of adhesion to most construction substrates and can be overpainted with oil, polyurethane or latex paints.

  • The flame-retardant grade reaches EN45545-2 HL3, with strong flame-retardant performance.
  • Low smoke emission in the burning state.
  • It has good adhesion to a variety of substrates.
  • Good UV resistance and weather resistance.
KASTAR 978 Fire resistant MS polymer sealant
Smooth colloid Pure color, forming fast, without collapse
KASTAR 978 Fire resistant MS polymer sealant
Excellent toughness Excellent tightness No shrinkage
KASTAR 978 Fire resistant MS polymer sealant
Perfect adhesion breaking even bending 180°


  • 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.


It must not be used in totally confined spaces where sealant cannot cure due to lack of atmospheric moisture.

Multi-Seal can be applied to a variety of substrates directly. If not sure, we recommend a preliminary compatibility test.

Storage and shelf life

They should be protected from water, frost and adverse air conditions.

They should be kept dry and cool on wooden pallets at between +10 °C and +25 °C in moisture-free conditions.

The opened products should be consumed immediately.

Shelf life is maximum 9 months conditional to complying with the aforementioned storage conditions.

Packing Specification

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety-related data.

Product TypeVolumePack
Black, White, Grey300ml24
Black, White, Grey600ml20