FOX SILK MORTAR FC125 is a cement-based, polymer-reinforced, single-component finishing putty used for non-structural repairs; it is a high-adhesion, pre-paint skimming coat that can be applied by hand on interior and exterior facades of buildings. Complies with TS EN 1504-3:2008 standard, class R1.

Colour Palette

Packaging

20 kg
TDS

Product Description

FOX SILK MORTAR FC125 is a single-component, polymer-reinforced, cement-based finishing putty composed of mineral fillers and special cement, designed for surface levelling and skimming prior to painting. It can be easily applied with a trowel or spatula on vertical and overhead surfaces of building interiors and exteriors. Effective within an application thickness range of 1–3 mm, the product is also used for repairing pores, voids, and hairline cracks up to 3 mm deep. Its white colour helps achieve more efficient paint coverage; it enables Q3 and Q4 quality surface finishes to be obtained. Complies with TS EN 1504-3:2008 standard, class R1.

Key Benefits

  • Provides a smooth, dust-free surface prior to painting on interior and exterior facades.
  • Offers high adhesion strength to the substrate thanks to its polymer-reinforced formula.
  • Its white colour helps achieve efficient paint coverage with reduced paint consumption.
  • Meets Q3 and Q4 quality surface standards, delivering a superior aesthetic finish.
  • Has a putty consistency suitable for safe use on vertical and overhead applications.
  • Compatible with TS EN 1504-3:2008 class R1, making it suitable for projects with technical specifications.

Advantages

  • Provides a smooth surface in the final coat.
  • Polymer-modified.
  • Suitable for interior and exterior use.
  • Forms a dust-free, solid, and even surface prior to painting and coating.
  • Has a putty consistency.
  • Its white colour prepares a more efficient base for paint.
  • Q3 and Q4 quality surface finish is achieved.
PropertyValue
Material CompositionMineral fillers, polymer-reinforced special cement
Density1,60±0,10 kg/lt
ColourWhite
Compressive Strength (TS EN 12190, 28 days)≥10 MPa
Adhesion Strength (TS EN 1542, to Concrete, 28 days)≥0,8 MPa
Chloride Ion Content (TS EN 1015-17)≤%0,05
Reaction to Fire (EN 13501-1)A1
Application ThicknessMin. 1 mm - Max. 3 mm
Applicable Layer ThicknessMax. 1,5 mm
Substrate Temperature+5°C / +30°C
Service Temperature-20°C / +80°C
Maturation Time5-10 min
Pot Life~45 minutes (+23°C)
Touch Dry Time~4 hours
Waiting Time Between Coats2-3 hours
Full Cure Time24 hours
Conformity StandardTS EN 1504-3:2008, class R1

Usage Areas

  • As a levelling mortar prior to painting on all types of concrete and plaster
  • As a thin repair render on vertical and overhead applications
  • For repairing pores, voids, or hairline cracks up to 3 mm deep on surfaces

Application Steps

  1. 1

    Surface Preparation

    The surface to be treated must be free from mould release agents, dust, paint, and similar substances. Poorly adhering and weak particles must be removed from the surface. For surfaces requiring deep repair, FOX MORTAR FC188 T structural repair mortar is used. Prior to the finishing putty, the surface should be levelled using FOX SLİM MORTAR FC105 for surface correction and filling purposes. The surface to be treated must be dampened before application.

  2. 2

    Mixing

    The appropriate amount of water specified on the packaging (approximately 360±10 ml per 1 kg of product; approximately 7.20±0.20 litres of water per 20 kg bag) is poured into a clean mixing container. FOX SILK MORTAR FC125 is slowly added to the water while mixing with an electric mixer at 400–600 rpm for approximately 2–3 minutes until homogeneous. No lumps should remain in the material. The material is left to mature for 5–10 minutes, then mixed again for 1 minute before use.

  3. 3

    Application

    The prepared mixture is applied in a single pass at a thickness of 1–3 mm using a trowel or spatula onto the pre-dampened surface. After the mortar has drawn in, water is sprinkled on the surface and it is levelled with a plastic float. In extremely hot, dry, and windy conditions, protect against rapid evaporation for 48 hours using wet hessian cloth or curing materials.

  4. 4

    Tool Cleaning

    Tools and equipment used must be cleaned with water immediately after application. Once FOX SILK MORTAR FC125 has hardened, it can only be removed from the surface mechanically.

Critical

FOX SILK MORTAR FC125 must not be used under epoxy paints and coatings.

Critical

Must not be applied on surfaces that are unsound or have plaster defects deeper than 3 mm; in such cases FOX BASEMOR FC205 or FOX EPC MORTAR FC255 should be preferred.

Critical

FOX SILK MORTAR FC125 must be applied within 45 minutes at +23°C. This time is reduced to 20 minutes at +30°C.

Critical

In outdoor applications, the surface must be protected from sunlight, rain, wind, and frost for the first 24 hours.

Critical

The substrate and ambient temperature must not fall below the minimum permitted temperature (+5°C).

Important

In extremely hot, dry, and windy conditions, protect against rapid evaporation for 48 hours using wet hessian cloth or curing materials.

Important

Working and reaction times of cement-based repair mortars are affected by air temperature, humidity, and substrate temperature. High temperatures shorten the working time; low temperatures extend it.

Important

Opened packaging must be resealed and consumed within 1 week.

Important

The product must be stored at room temperature between +5°C and +30°C, in a cool and dry place away from direct sunlight. Shelf life is 12 months from the date of manufacture.

Important

During application, wear work clothing, protective gloves, goggles, and a mask. In case of contact with skin or eyes, wash thoroughly with plenty of water and soap; if swallowed, seek medical attention immediately.

Information

The product must be stored out of reach of children.

Information

The technical values above are given for conditions of +23°C and 50% relative humidity.