Polymer Quenching

Polymer Quenching Oil for Hardening Machined Parts & Stampings

Polymer quenching is an ideal method for hardening machined parts & stampings made from lightly alloyed steels such as 1045, 1144, 1035, or even parts made from more heavily alloyed steels with difficult mechanical property requirements.  


Therm-Tech runs all polymer quench hardening out of batch-type furnaces, which are ideal for process and lot control.  

Our largest furnace used for this process has internal working dimensions of 88”W x 129”L x 42”H.

Our largest polymer quench tank has dimensions of  74” x 103” x 54”.  

All of Therm-Tech’s furnaces are certified to AMS 2750, ensuring optimal temperature uniformity during the hardening process.

Some of the most common materials we offer this process for include:

  • 1045 steel
  • 1050 steel
  • 4140 steel
  • 1035 steel
  • 1145 steel

Therm-Tech has the capability to quench polymers of various concentrations and levels of agitation to maximize mechanical properties while minimizing distortion.

However, in cases where severe distortion during polymer quenching is process-prohibitive we recommend oil quench hardening, marquench hardening or austempering services.


The process of polymer quenching for machined parts and stampings is performed by first fully austenitizing the steel in the temperature range of 1500°F – 1650°F (depending on the alloy) in a surface-protecting, carbon-controlled atmosphere.

It's held at this temperature for a time proportionate with the part cross section, and then quenched in polymer to produce a fully hardened martensitic microstructure.

After quenching, parts are tempered to specification.


Please be aware that lower final hardness ranges that require tempering above 900°F will result in temper oxide formation on most steel grades.

ThermTech offers a variety of blasting services for machined parts to remove any oxide formation & improve the surface finish.

For bright finish requirements, ThermTech is also offers vacuum hardening with either gas or oil quenching.

Contact ThermTech today to find out how our polymer hardening process can benefit your machined parts or stampings!