HOME > INDUSTRY > Plastic & Rubber > HFFR Process

HFFR Process

Halogen Free Retardant Compounds (HFFR) Requirements

In the past, the majority of cables used in installations were insulated with PVC or a similar material. These insulation materials release chlorine gas during a fire. Chlorine is a highly toxic gas that poses a threat to human health. Additionally, when it comes into contact with water, it produces hydrochloric acid. Hydrochloric acid can be extremely damaging to adjacent equipment.

Halogen-free cables are used to avoid the problems associated with the release of chlorine gas. Typically, halogen-free cables are made of polypropylene, which does not emit dangerous gases or acids during a fire.

The primary requirements for the HFFR process are good filler dispersion (improved toughness and surface properties) and distribution (consistency), high filler loadings of up to 65 weight percent, and no degradation of thermally sensitive (ATH) fillers.

Tiermax offers a complete HFFR compounding line, from bulk material handling to dosing and feeding, compounding, pelletizing, cooling, and classifying, as well as bagging systems.

HFFR Process

Advantage of Tiermax HFFR Cable Compounding Systems

  • Higher (favorable) free volume, lower shear rate, and lesser residence time than conventional extruders.
  • High filler loadings due to improvised geometry.
  • Accurate temperature control of process sections (barrel AND screw).
  • Good self-cleaning mechanism.
  • Fast product changeover.
  • Easy to clean (split barrel construction).
  • Injection of liquids into the molten stock.
  • Better mixing in a shorter processing length ensures lower
    heat history of product.


HFFR Process

Extruder and Compounding Machine

Tiermax twin screw extruders are custom-built to meet the exact specifications of your HFFR cable compound recipes.

We offer the best turnkey solution for bulk material conveying, dosing, mixing, compounding, pelletizing, and sieving systems based on the technical expertise of our engineers.

We provide bulk material handling equipment for raw materials and finished goods.

HFFR Process

Pneumatic Conveying System

Tiermax pneumatic conveying systems (pressure or vacuum, dense or dilute phase) are used to move both raw materials and finished goods. They can be used for both.

Pneumatic conveying is used to move granular and powdered ingredients between and inside each stage of the process (unloading, storage, processing, mixing, blending, and packing).