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RD-PS-S

polymer-silicate render for spray application

2025-11-10T17:49:26+00:00

Terrix® RD–PS-S
polymer-silicate render 
for spray application

A modern polymer-silicate thin coat render for spray application.
Terrix® RD-PS-S 1.5 is based on innovative Swiss, patented technology converting potassium water glass into a polymer. Polymer-silicate render has all advantages of well known in heritage/historical building renovation market silicate renders without limitations related to the application process. Due to its mineral characteristic and lack of surface electrostatics, the product is the most resistant type of render on the market. Terrix® RD-PS-S 1.5 will never delaminate as it is adhered to a substrate by a chemical reaction.
Another important property of the render is its built-in high resistance to microbial contamination (e.g. algae) and efflorescence. Terrix® RD-PS-S 1.5 is recommended for use in coastal areas with high exposure to elements.
Terrix® RD-PS-S 1.5 can be used on one of the following systems:
• part of EWI systems based on EPS, PUR or Mineral Wool
• part of the anti-crack renovation render system
• part of two coat render system
• part of cavity-free timber frame system
Terrix® RD-PS-S 1.5 is suitable for both new build and retrofit and can be applied to mineral and synthetic substrates (e.g. concrete, cement and limestone renders), a substrate covered with sound synthetic coatings.

Files to download

Benefits

Benefits to the customer:

  • No flaking or cracking as Terrix® RD-PS-S paints bond to the substrate by chemical reaction. Acrylic and silicone render to create a film on top of a substrate, which can lead to peeling or cracking.
  • High resistance to elements – the render is fully suitable for coastal application.
  • Very high resistance to dirt- not achievable by any organic-based renders on the market (all acrylics and silicone even with self-clean effect) it is due to its mineral formulation and, therefore, lack of surface electrostatics. The dust won’t be attracted to the render.
  • Flame retardancy due to the lack of organic components in the render and pigments used for colouring. In contrast to most renders on the market, Terrix® RD-PS-S provides protection against the spread of flame. The mineral characteristic of the product makes it fully incombustible.
  • Very high resistance to yellowing – Built-in UV blockers to maintain the original look of the render.
  • Natural algae resistance – Increased pH level (high alkalinity) delivers natural and long-lasting protection. Other products on the market are protected by the addition of biocides, which have a limited lifespan (5-6 years).
  • Very low water absorption – The product is more resistant for winter when water freezes and, by expanding, causes system failures.
  • Spot repairs – the product can be easily spot repaired without leaving any visible patches, which is usually impossible to achieve with hand-applied renders on the market.
  • Low maintenance cost – due to render prosperities and application method, the cost of maintenance is usually many times lower than other products.

Benefits to the applicator:

  • Spray application – up to 5 times faster than a traditional application.
  • Decreased wash-off risk – due to the partly chemical curing process. Acrylic and silicon renders drying by evaporation only. During winter time, that process may be very long and lead to wash-offs even after a few weeks after application.
  • Easy spot repairs – effortless snagging and seamless spot repairs – the product consistency and formulation allow for simple snagging/spot repairs without the need to redo the entire wall.
  • Can be applied on not fully dry substrates – due to the polymer-silicate prosperities of the product, it is fully vapour permeable and therefore, the render can be used for difficult applications like old damp buildings or new builds where walls and renders are still wet, and use of silicone or acrylic renders would not be possible.

Technical Data

Base binder: potassium silicate;
Pigments: weather-resistant inorganic colour pigments;
Colours: available in natural white and selected colours from the Terrix® chart, NCS, or based on a provided sample—provided that the colours are achievable using silicate-compatible inorganic pigments;
Texture grained: 1.5 mm;
Diluent: water;
Reaction to fire: A2 – s1,d0;
Temperature of application (air and substrate): from +5 °C to +25 °C;
Maximum application relative air humidity: ≤ 75 %;
Density: approx. 1.50 g/cm3;
Average usage: 2.2 kg/m2;
Vapour permeability: Class V1;
Water absorption: ClassW2;
Adhesion to substrate: ≥ 0.30 MPa;
Thermal conductivity: λ = 0.76 W/(m·K);
Packaging: 20 kg plastic bucket;
Storage: store in the tightly sealed, original packaging in a cool area, ensuring protection against frost. Opened packaging should be tightly closed and used as quickly as possible;
Shelf life : 18 months from the date of production (factory-sealed packaging).

CAUTION : Keep the product out of reach of children.

Aplication

Substrate preparation: 

Apply to a sound and clean substrate (without cracks and delaminations), degreased, even, dry, and biological or chemical efflorescence free). The substrate should be free of algae/fungi growth.
In case of microbial contamination, the substrate should be cleaned with a power washer. Subsequently, a biocide solution for removing microbial contamination is to be applied as per the product manual. Any loose layers not bound to the substrate (such as loose plasters or flaked paint coats) should be removed. Wash and degrease old and/ or dirty substrate with water and a cleaning agent.

Note: 

The finish coat may not be applied on the newly completed mineral substrate, i.e. cement or lime mortar renders )- min.: of 2 weeks curing period is required.
If the product is being used as a part of Terrix® render systems, refer to the system manual for detailed application instructions. 

Priming:

The substrate should be primed with Terrix® PR-PS-R before applying the render. The primer should be dry before applying a finish coat (approx. 24 h). It is recommended to use a primer that is the same colour as the finish coat. 

Preparation: 

The packaging contains a ready-to-use product. If stored for a long time and before application, the product should be thoroughly mixed with a low-speed mixer fitted with a basket stirrer until a smooth, homogenous consistency is obtained. Further mixing is not recommended as it may result in excessive product aeration. If required, add a small amount of clean water ( max. 0.1 L per 20 kg of the product ). The quantity of added water may vary for different substrate types, weather conditions and application methods. 

Application method:

Render should be applied onto the substrate using a pneumatic spraying device at a working pressure of 3-4 atmospheres and a nozzle diameter of 5 to 6 mm.
While spraying, the gun should be kept perpendicularly to the substrate at a distance of 0.4 – 0.6 m. 

Drying: 

Typical binding ( setting ) time ca. 24h ( 20 °C, 55 % RH ). 

NOTE: 

Drying time may be longer due to low temperatures and high relative humidity. To assist in drying the finish coat, the surface should be protected against precipitation and condensation.

Important: Do not apply in rain or if rain is expected within 24 hours.

Useful hints: 

The final effect may depend on the substrate type. For non-uniform substrates, it is recommended to skim at first the whole surface with base coat mortar.
A single batch product should be used on a single application / architectural element to avoid colour differences.
́ Wet on wet ́ method should be used.
To be applied on dry days at temperatures between 5-25°C.
Avoid applying in direct sunlight or during strong winds. To protect the top coat against inclement weather conditions, scaffolding should be covered with protective netting or tarpaulin. 

Property High quality silicon renders in the U.K.

(manual application)

 Terrix® polymer-silicate
1 Render type silicone polymer-silicate
2 Category premium premium
3 Black mould/ algae resistance limited very high
4 Adhesion to substrate mechanical (film) chemical bonding
5 Risk of cracking or flacking high none
6 Dirt resistance average very high
 7 Vapour permeability average very high
 8 Application on not fully dry substrates not possible possible
 9 Resistance to elements average very high
10 Spot repair difficult easy
11 Flame Retardancy none Category A
12 Colour resistance average to good very good
13 Water absorption low very low

Comparison

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Q&A

Terrix® RD-PS-S is a modern polymer-silicate thin coat render for spray application. It is based on an innovative Swiss patented technology that converts potassium water glass into a polymer. As a result, it provides numerous advantages over traditional renders, such as resistance to dirt, algae growth, and elements and low water absorption.

My name isTerrix® RD-PS-S is a polymer-silicate render designed to have minimal surface electrostatics. This means that the surface of the render doesn’t attract or hold dirt and dust particles as much as other renders with higher surface electrostatics. As a result, the finished walls maintain their clean appearance for a longer time, reducing the need for frequent cleaning or maintenance.

Terrix® RD-PS-S is a polymer-silicate render which offers significant advantages over organic-based renders such as acrylics and silicones. It benefits from the durability and resistance to environmental factors of both mineral and polymer renders. This unique combination results in a render that is more resistant to weathering, UV radiation, and other elements, extending its lifespan compared to organic-based renders.

Terrix® RD-PS-S adheres to the substrate through a chemical reaction rather than relying solely on mechanical bonding. The specially modified potassium water glass in the product reacts with the substrate, forming a strong bond at the molecular level. This chemical bonding process significantly reduces the risk of flaking or delamination compared to other renders that rely on mechanical adhesion alone.

Terrix® RD-PS-S is formulated to resist algae growth due to its mineral composition and the lack of surface electrostatics. The product’s mineral nature makes it less susceptible to organic growth, and the absence of surface electrostatics prevents the accumulation of dirt and dust particles, which can contribute to algae growth. Moreover, the render’s high vapour permeability allows the wall to breathe, minimizing the risk of moisture-related issues that could promote algae growth.

Terrix® RD-PS-S is a fully vapour-permeable render, which means it allows water vapour to pass through its structure. This property is crucial for maintaining a healthy building envelope, as it allows moisture within the wall structure to escape, preventing the build-up of condensation and dampness. The vapour permeability of Terrix® RD-PS-S helps to regulate humidity levels in the building, promoting a comfortable and healthy indoor environment and protecting the structural integrity of the wall.

Terrix® RD-PS-S provides high resistance to elements due to its unique polymer-silicate composition. The render combines the advantages of mineral and polymer renders, offering excellent durability and resistance to various environmental factors such as UV radiation, wind, rain, and temperature fluctuations. The non-organic coloured pigments used in the product also have high resistance to the elements, ensuring long-lasting colour stability and an attractive finish.

Terrix® RD-PS-S render has a low water absorption rate of w = 0.16 kg/m2 ∙ h0.5 (CAT. W2), reducing the risk of water-related damage.

Yes, Terrix® RD-PS-S render is designed for spray application, making the application process up to five times faster than traditional methods.

Terrix® RD-PS-S render offers low-cost maintenance due to its extended resistance to dirt, algae growth, and environmental factors, resulting in a longer-lasting and cleaner facade. Additionally, the render can be spot-repaired without a visible patch.

Terrix® RD-PS-S can be applied to mineral and synthetic substrates, such as concrete, cement, limestone renders, and substrates covered with sound synthetic coatings.

The substrate should be sound, clean, degreased, even, dry, and free of biological or chemical efflorescence and algae/fungi growth. Any loose layers not bound to the substrate should be removed, and the substrate should be washed and degreased with water and a cleaning agent.

Yes, the substrate should be primed with Terrix® PR-PS-R before applying the render. The primer should be dry (approx. 24h) before applying the finish.

The main properties include extended resistance to dirt, a longer lifespan compared to organic-based renders, chemical bonding to the substrate, high resistance to algae growth, full vapour permeability, high resistance to elements, low water absorption, suitability for spray application, and low-cost maintenance.

Terrix® RD-PS-S can be used in various systems, including EWI systems based on EPS, Poliurethane, or Mineral Wool, anti-crack renovation, two-coat render systems, and cavity-free timber frame systems.

A minimum curing period of two weeks is required before applying the render on newly completed mineral substrates like cement, or lime mortar renders.

The render should be applied using a pneumatic spraying device at a working pressure of 3-4 atmospheres and a nozzle diameter of 5-6 mm. Keep the gun perpendicular to the substrate at a distance of 0.4-0.6 m while spraying.

The typical binding (setting) time is approximately 24 hours at 20°C and 55% relative humidity. Drying time may be longer in low temperatures and high relative humidity conditions.

Yes, Terrix® RD-PS-S (w) is the winter version of the product, providing accelerated 8-hour wash-off resistance at a minimum temperature of 5°C and 75% relative humidity.

Yes, it can be applied to mineral and synthetic substrates in new build and retrofit projects, as long as the substrate is sound and properly prepared.

Terrix® PR-PS-R primer should be used on the substrate before applying the render. The primer should be dry before applying the finish coat, which typically takes around 24 hours.

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