Chlorinated paraffins are manufactured by the chlorination of n-paraffin or paraffin wax. The process is considered to be batch wise. This reaction is exothermic and further leads to the generation of the by-product hydrochloric acid. With the increase in chlorine content the viscosity and density also increases. Chlorinated paraffins show their solubility with organic solvents such as aliphatic and aromatic hydrocarbons, chlorinated solvents and esters. Chlorinated Paraffins containing 30-70% chlorine are largely inert liquid and almost insoluble in water. However, Chlorinated Paraffin 52% is the most widely used all over the world.

GRADE SPECIFICATION cp40 cp42 cp45 cp52 cp55 cp58 cp60 cp70
% CHLORINE CONTENT 40.0 ± 2.0 40.0 ± 2.0 45.0 ± 2.0 52.0 + 2.0 55.0 ± 3.0 58.0 ± 2.0 62.0 ± 2.0 70.0 ± 2.0
SPECIFIC GRAVITY at 27ºC 1.11 ± 0.02 1.12 ± 0.02 1.20 ± 0.02 1.280 + 0.02 1.32 ± 0.02 1.36 ± 0.02 1.40 ± 0.02 1.54 ± 0.02
(at 50°C)
COLOUR (HU); Max 60 60 60 100 60 60 60 100
Volatile loss; %
180ºC/4 hours (Max)
3.50 3.00 3.5 4 1.80 1.20 0.90 1.00
HEAT STABILITY 180ºC/
20 Minutes Max., Colour changed
YELLOW YELLOW YELLOW YELLOW YELLOW YELLOW YELLOW DARK YELLOW
THERMAL STABILITY %
(175ºC / 4 Hrs.) ; Max.
0.10 0.10 0.10 0.20 0.10 0.10 0.10 0.10
VISCOSITY at 27ºC ; (Poise) 0.5 – 1.0 0.6 — 1.1 2 – 7 15 – 30 20-35 125 — 400 600 — 1500 200 — 600
REFRACTIVE INDEX at 27ºC 1.483 ± 0.002 1.484 ± 0.002 1.498 ± 0.002 1.510 + 0.002 1.509 ± 0.002 1.518 ± 0.002 1.524 ± 0.002
FREE MINERAL ACIDITY %; (Max) 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001
FREE CHLORINE NIL NIL NIL NIL NIL NIL NIL NIL
pH VALUE; (Min) 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0

Chlorinated paraffin uses

  • Chlorinated paraffins are used widely as a secondary plasticizer in the flexible PVC products especially in the notably cable, footwear, hosing, conveyor belting, coated fabrics and profiles.
  • It is used in lubricants as an extreme pressure additive, where it forms a tenacious film on working parts. In cutting oils it is used as an additive to minimize ‘weld’ formation.
  • It is used as a plasticizer for binders and resins in the paints and it is also used in caulks and sealants.
  • Textiles for carpets, carpet backing, tarpaulins and tents and Paints can be treated with compositions to induce flame retardancy.