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Gray gel in a 32 oz spray bottle

Nu-Calgon

Nu-Calgon 4371-32 Heat Protective Barrier 1 qt air treatment

SKU CH-FV8M-QC7WP

Heat protective barrier gel in a 1 qt spray bottle shields components during brazing and soldering

  • Product colorGray
  • Protects surfaces from heat damage during brazing and soldering
  • Gel formula adheres to vertical surfaces without running off
  • Gray colour shows coverage clearly on metal pipework
  • One-quart spray bottle allows controlled application on site
  • Nu-Calgon brand trusted by HVAC professionals for reliability

Heat Protective Barrier for HVAC Work

This Nu-Calgon gel forms a thermal shield during brazing and soldering tasks. The grey compound is brushed or sprayed onto nearby surfaces to stop heat damage. It suits technicians who need reliable protection on copper, steel or brass pipework.

Sustained Heat Resistance During Long Joints

The gel stays in place while the torch runs, absorbing and deflecting heat away from valves, insulation or painted finishes. It does not drip or break down during extended heating cycles typical of commercial HVAC installs.

Clean-Up and Safety in Normal Use

After the joint cools, the water-soluble residue wipes off with a damp cloth. The formula contains no asbestos and produces minimal odour, keeping the work area safer for the operator and any building occupants.

How it compares

Measured against everything we stock in Air Purification & Protection, at today’s prices. Recalculated every night.

Price $21.99
Cheaper than about 68% of the 59 comparable items (median $29.99).

Specifications

Product
Brand nameNU-CALGON
Product colorGray

Questions about this item

How much heat does the 1 qt gel give off while it is protecting joints during a long brazing job?

The gray gel is designed to absorb and block heat rather than generate it, so it stays cool to the touch while shielding surrounding surfaces during extended brazing or soldering sessions.

What tools or equipment must I already have to apply this heat protective barrier?

You need a standard spray bottle to dispense the 1 qt gel and a brazing or soldering torch to create the joints the barrier is meant to protect.

Will the 4371-32 barrier damage older copper or brass fittings I plan to keep in the system?

The compound is formulated to be non-corrosive and safe for use with existing copper, brass and steel components commonly found in HVAC and refrigeration piping.

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