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GÓRKAL 50+

Description

GÓRKAL 50+ is a hydraulic binder for refractory and building applications, manufactured and controlled in accordance with the PN-EN 14647 standard. Its key feature is the low Fe₂O₃ content (below 3%), which provides high purity and property stability at temperatures up to 146 sP (Seger cone). Thanks to a stable phase composition (main phase CA with secondary CA₂), this cement is oriented towards use in insulating refractory mixes, monolithic products, and building chemistry.

Documentation

GÓRKAL 50+

Advantages

  • High purity and low iron oxide content (below 3%) – minimizes the risk of contamination in high-temperature processes, especially in insulating layers exposed to aggressive media.
  • Enhanced refractoriness (≥146 sP) – allows use in hotter zones compared to standard aluminous cements, extending the limits of insulating linings.
  • Balanced setting time – initial setting over 220 minutes provides sufficient working time for placing and forming large monolithic components.
  • High final strength – over 45 MPa after 24 hours, ensuring mechanical reliability even in lightweight insulating structures.
  • Resistance to thermal shock and aggressive environments – stability under sulphate and chloride attack, and during rapid temperature changes.
  • Cold weather applicability (down to -10 °C) without heating – convenience in winter conditions.

Technical Specifications

ParameterValue
Chemical composition (typical values)Al₂O₃ 51–55%, CaO < 38%, SiO₂ < 5%, Fe₂O₃ < 3%
Principal mineralogical phaseCA
Secondary phasesCA₂, C₄AF, C₁₂A₇, C₂AS
Specific surface (Blaine)3000–3500 cm²/g
Refractoriness≥ 146 sP (Seger cone)
Density3.0 g/cm³
Bulk density1.1 g/cm³
Initial setting time> 220 minutes
Final setting time< 600 minutes
Cold crushing strength after 6 h> 18 MPa
Cold crushing strength after 24 h> 45 MPa
Shelf life in dry conditionsup to 12 months from production date

Note: characteristics determined in accordance with EN-196. Exact values may vary within specification limits.

Applications

  • Insulating refractory mixes and lightweight monolithic linings for thermal units (furnaces, boilers, dryers) – primary purpose.
  • Building chemistry: dry mixes and concretes where high purity and low iron content are required.
  • Refractory pulps for filling voids and creating seamless insulation.
  • Special hydraulically hardened concretes for chemically aggressive environments.
  • Production of prefabricated refractory elements with high thermal insulation properties.

Packaging

GÓRKAL 50+ aluminous cement is packed in multi-layer 25/50 kg bags or 1 t big bags, providing protection against moisture. Exact weight and packaging type to be confirmed upon order.

FAQ

Yes, the cement can be applied down to -10 °C without the need for heating. It releases sufficient heat during hardening to ensure strength development.

Compressive strength exceeds 18 MPa after 6 hours and over 45 MPa after 24 hours. The longer initial setting time (over 220 minutes) facilitates placement of large volumes.

GÓRKAL 50+ contains more alumina (51–55% vs >41%) and significantly less iron oxide (<3% vs ≤16%), giving it higher refractoriness (≥146 sP vs ≥128 sP). It is preferred for insulating refractory mixes and monolithic products, while GÓRKAL 40 is more often used for structural refractories and repair mortars.

When stored in dry conditions, the shelf life is up to 12 months from the production date. Avoid contact with moisture.

Its primary purpose is insulating refractory mixes and lightweight monolithic linings. It also excels in building chemistry where high purity and low iron content are essential.