Rubber and rubber mastic

Rubber and rubber mastic

Materials based on low molecular weight dimethylsiloxane rubber for the manufacturing of various rubbers, sealants, sealing of building seams, electrical insulation, vibration protection

Waterproofing mastic ZHKMg

Product description

Waterproofing mastic ZHKMg


Waterproofing mastic ZHKMg is two-component self-curing system consisting of rubber base and hardener.


Mastic is intended for use in the construction and repair of buildings and structures (including nuclear facilities) when performing the following work:

  • Joints sealing of concrete and reinforced concrete structures with a maximum deformation of 25%
  • Building structures junctions sealing
  • Gaps and cracks sealing.


  • The material is hydrophobic and provides hydrophobicity of the treated objects.
  • Mastic is resistant to the influence of atmospheric factors.
  • Mastic is resistant to the action of ozone and UV.
  • The material has good dielectric properties.

Application methods

Surface preparation:

Before applying mastic, clean the surface of all contaminants that reduce the adhesive bond strength of the sealant and the surface and remove dust.

Mastic preparation

Before application, thoroughly mix the mastic base with the hardener in the ratio 4 parts by weight of hardener for 100 parts by weight of base (or as indicated in the passport for batch of products). For mixing, we recommend to use a slow speed drill with the mixer for viscous pastes.

WARNING! Pot life of mastic at +20°C is up to 1 hour.


Apply the mastic with a spatula, a syringe or other device. Mastic layer shall be at least 5 mm. The mastic should be applied evenly, without breaks, rolls and voids.

It is forbidden to apply mastic during rain and snowfall, if there is a danger of rainfall on the surface on which the mastic is applied.


Store the mastic ZHKMg in closed warehouse in a sealed container at a temperature from -30°C to +40°C, protected from direct sunlight.

The guaranteed shelf life in original container is 12 months.

Storage over the date specified on the label does not necessarily mean the product is unusable. In case if store more please check the properties of product before use.


Mastic is supplied in metal buckets with a capacity of 10L or 20L.

The hardener is supplied in polymer containers (with gas vent valve) with a volume of 0.5 l or 1 l.

Safety information

The application of the mastic does not require special safety measures.

Detailed instructions are given in the relevant product safety data sheet. It can be provided upon request.

Physical and chemical properties

Parameter name and measure unitStandard
AppearanceHomogeneous, without impurities
Coating color

Must comply with approved color pattern

Relative strength, MPa, min0.6*
Elongation, %, min.200
Adhesion to concrete, MPa, min0.4
Water absorption for 24 h, %, max0.4
Flexibility on a beam diameter of 5 mm at -30°C.5.0±0.2
Water tightness, min, MPa/time0.03 / 10 minutes
Heat resistance, %, max.1.0
Curing time at +20°C, h, max24
Shelf life (viability) of mastic at a temperature (+20± )°C, h, min1
Light resistance, h, min.2
Note: * When reinforcing glass fiber, glass fleece or polyester mesh – (3-3,5) MPa