U-30MES-5M liquid polysulfide polymers-based sealant

U-30MES-5M liquid polysulfide polymers-based sealant

U-30MES-5M liquid polysulfide polymers (thiokol)-based sealant is a composition consisting of three components: base (sealing) paste, hardening (curing) paste, and a curing accelerator. After mixing the components, the sealant irreversibly transitions into a black rubber-like material (other color shades are not possible). U-30MES-5 sealant is capable of curing at a temperature not lower than 15 °С. Thiokol sealants based on liquid polysulfide polymers feature good deformability, high oil and petrol resistance, good resistance to UV radiation, oxygen, moisture and air impermeability. Due to its liquid polysulfide polymer base, U-30MES-5M sealant is resistant to crude oil, oil products, solutions of acids, alkalis, salts and solvents. The sealant is recommended for use in contact with aluminum alloys, non-anodized, magnesium alloys, cadmium plated and bare steel.


U-30MES-5M liquid polysulfide polymers-based sealant is designed for surface and seam sealing of riveted, welded and bolted joints, aircraft structures, instruments and other items, for repair of aircraft equipment. It is recommended for use in the temperature range from -60°С to +130°С in air and type ТС-1 fuel environment


Specification 38.1051436-88


  1. good deformability;
  2. high oil and gasoline resistance;
  3. good UV and oxygen resistance;
  4. moisture and air impermeability.

Technical characteristics



Pot life, h, within the range of


Nominal tensile strength, MPa, minimum


Elongation at break, %, minimum


Relative residual deformation after breaking, %, maximum


Shore A hardness, units, minimum


Bond strength when peeled from D-16 anodized alloy, kN/m, minimum


Brittleness temperature limit, °С, not higher than


Working temperature range, °С

– in air environment

– in TS-1 type fuel environment

– 60 to + 130

(short-time at + 150)

-60 to + 130


Base paste – metal container,

Curing paste – plastic can,

Curing accelerator – plastic bag.

Guaranteed shelf life:

Base paste – 4 months,

Curing paste – 12 months,

Curing accelerator – 12 months

The product is manufactured according to the Specification. The product meets the stated information within the shelf life and subject to storage conditions.