Thermo12® Cal-Sil Overview

We give you 6 Reasons Why You Should Choose IIG’s Cal-Sil...

1. High Compressive Strength

Compressive strength indicates:

  • Ability of material to resist deformation under compressive load
  • Ability to withstand mechanical abuse
  • Ability to withstand foot traffic and maintenance work

Implications of low compressive strength material

  • Loss of thermal performance
  • Safety hazard due to high surface temperature
  • Broken weather barrier allows moisture incursion
  • Reduces the life of the jacket, pipe, and equipment

The results of low compressive strength

The results of low compressive strength

2. Corrosion

The corrosion of steel under insulation is a major concern to industry. It can be a safety hazard, maintenance challenge, disrupt the process and limit the system lifecycle. Compared to other types of insulation, IIG Thermo-12 Gold with XOX can help reduce corrosion damage.


The above steel pipe was insulated with IIG’s Thermo-12 Gold, then exposed to the weather for 1yr without sealed joints in the jacket.



Fibrous Insulation products will absorb moisture over time that can lead to significant corrosion.

3. Health and Safety

IIG Pioneered the "Asbestos Free" Cal-Sil

Asbestos was a popular reinforcement fiber that was widely used prior to the IARC discovery that it caused cancer and serious lung damages. IIG uses absolutely zero asbestos in its products across its manufacturing facilities worldwide.


4. Binder Free

Fibrous insulation requires the use of organic binders to secure the fiber in place. However, with temperatures above 232°C, organic binders will burn-off resulting in reduced product integrity (slump/sag) causing vulnerability to:

  • Corrosion on pipe and equipment surfaces;
  • Reduced compressive strength;
  • Vibration to include ultrasonic vibration induced by high-temperature steam flow around internal pipe obstructions such valve internals, measuring devices, and flow restriction orifices;
  • Linear shrinkage most prominent on vertical applications;
  • Increased surface temperatures;
  • Greater heat loss in operating systems.

Loss on Ignition (LOI) using Organic Binders

Fibrous Insulation: LOI on board @ 1.5% to 6%
LOI on pipe @ 3% to 6%
Calcium Silicate: None

Why is this important?

  • The organic binder is what holds the fibrous insulation together. It begins to oxidize near 199°C
  • Oxidized binder makes the insulation material weaker and more likely to be damaged.

5. Vibration Resistant

Vibration Resistant

The above fibrous insulated pipe displays the result of binder burnout and settling due to vibration causing:

  • Burns to plant personnel
  • Higher operating costs
  • Downstream fluid temperatures not being maintained resulting in the need for external heat tracing in order to maintain process control

6. Maintenance & Energy Cost Savings

The following line graph displays the Insulation Thickness at the Economic Thickness for the Temperature

Energy Cost Savings

Image of IIG Calcium Silicate

IIG Calcium Silicate