NaturalSealer NS-H


NaturalSealer NS-H is lithium silicate based hardeners/densifiers for concrete floor.

When applied on concrete, it penetrates into concrete, reacts with the excess calcium hydroxides of concrete and then forms additional C-S-H (calcium silicate hydrate) which is chemically integrated with the existing concrete. Because calcium hydroxides of concrete surface are already reacted with NS-H, the treated concrete surface is chemically stable and becomes stronger against chemical corrosion by acids, pollutants and salts. Additional C-S-H increases the density and strength of concrete surface layer. It provides breathable and durable treatments for concrete floor.


It is a special lithium silicate for concrete surface hardening.

It effectively reacts with concrete, it is integrated in concrete and provides durable treatment.

It does not coat the surface of concrete, so the treated concrete breathes as ever.

The appearance of the treated concrete is not changed.

The densification of concrete surface goes better as time passes.

It can be applied both new and old concrete.

Easy application


Enhanced compressive strength and abrasion-resistance

Enhanced chemical resistance by chemical stabilization of concrete surface

Protection of concrete and the extension of concrete life


Protecting and hardening exposed concrete

Protecting and hardening for concrete floor of chemical plants, agricultural storage warehouse and processing factory, parking buildings, convention centers, shopping malls, etc.

Product Specifications

pH 11-12
Specific gravity (25℃) 1.100-1.200
Solid (wt%, 250℃, 1Hr) 15±1
Viscosity (cps, 25℃) Max. 20

Appearance : Transparent liquid

Odor : None

Freezing point : 0℃ (32℉). Do not freeze it.

Storage : 12 months at normal condition and closed container

Packaging : 18L/can, 200L/drum

Coverage Rate Recommendation

The coverage rate 0.2ℓ/㎡ is recommended for new concrete with the compressive strength over 25 MPa.

For old concrete with the compressive strength under 25 MPa, the coverage rate 0.3ℓ/㎡ is recommended.

Coverage rate depends on the porosity of concrete. The appropriate coverage rate of treated concrete needs to be determined before application.

Application Recommendation

1)Cleaning the concrete surface:

The effect of NS-H depends on its full and equal penetrating.

It should not be applied to concrete surfaces that have been either coated or oiled. Such surfaces must be cleaned before it is applied. Laitance also needs to be removed.

It should not be applied on the surfaces which NS-H can not penetrates into, such as soaked surface or surface water is running over or have puddles of water on. Such surfaces must be dried before it is applied

It can treat both old and new concrete, but the newly poured concrete must be cured at least 28 days or more.

2)Working conditions:

Use NS-H at the condition between 5℃ and 35℃.

Do not use NS-H on very hot, freezing, rainy or high windy days.


Apply NS-H once by means of low-velocity spray unit. In order to apply full and equal penetrating, adjust spraying velocity, angle and moving speed of nozzle.

Do not apply excess hardener on concrete enough to make a puddle on the surface. After drying, the excess hardener may form film caused to white stains. If some liquid is no longer absorbed and remained on surface, remove it immediately with a broom or roller.


Initial curing period is more than 3 days. The drying time is typically within one hour, very shorter than curing time. Longer curing time is better. Cure the treated concrete more than 15 days.

Keep water not to run over or not to make puddles on the treated concrete surface during initial curing period.

5)Compatibility with other coatings:

If necessary, paint or coating can be applied on the treated concrete surface with NS-H. However, sufficient curing more than 2 weeks is needed before painting or coating.


This product is for concrete only. It can not be used for blocks or stones.

Since this product is soluble silicate, it can not be removed well when it is attached to glass or aluminum. Protect adjacent windows or vehicles before application.


Read the Material Safety Data Sheet before handling and using.

Do not freeze. Keep closed container.

Do not breathe spray mist. Do not taste or swallow.

Wash thoroughly after handling.

Promptly clean up spills or contaminated clothing with water.