Thermal Flux is a sound effects library formed by extreme temperature reactions.
With materials ranging from -119°F to 1900°F all captured at 192kHz/24bit, it’s a fiery (and icy) collection of unique sound design source material.
What’s included?
- Roaring Molten Glass & Metal
- Steaming Wet & Dry Ice
- Hissing Red Hot Ball Bearings and Knives
- Spattering Melting Soap, Cheese, Gel, etc.
- Screaming & Chattering Waterbeads
- Much More!
Library Preview
The recordings in Thermal Flux have a temperature range of over 2000°F! From bone chilling -119°F dry ice to blistering 1900°F molten glass. The heart of Thermal flux is extremely hot and cold objects interacting with each other. All of the sounds you hear are made solely by potential and kinetic thermal energy of the many props… thermodynamics at work!
In each recording, props with vast temperature differentials interact with each other… Red hot ball bearings vaporize liquids, melt ice, and destroy various household products. Extremely cold metal instantly freezes water. Molten metals and glass pour into water, groaning, chirping, and crackling, as they solidify. Dry ice causes coins to viciously chatter. Water beads bounce, whine, and buzz on blazing hot pans. White hot sand roars and erupts upon contact with water. All of this and more was recorded with mics capturing quality frequency information up to ~65kHz. This ultrasonic content allows for extreme pitch shifting without compromising fidelity.

Ultrasonic Content
Like every other sound design library from Collected Transients, Thermal Flux was recorded at 192kHz/24bit with microphones that capture ultrasonic sounds. “But I’m not a dog!” you say, “I only hear to a mere 20,000 Hz.”
Fret not, Sound Designer, the ultrasonic content in these collections is captured to allow you to massively pitch-shift and process the sounds while retaining fidelity and revealing elements you couldn’t perceive before. Don’t take our word for it. Listen to demos and learn more here!

Thorough UCS Metadata
Thermal Flux offers thorough UCS compliant metadata that works across all popular audio database software. Each file is embedded with exhaustive information about the recording. Aside from the usual ‘description’, many other fields are available that provide useful tidbits like recording notes, microphone information, category, and sub-category. All sound effects also come embedded with an image showing exactly what was being recorded.

Multi-Take Files
Thermal Flux takes advantage of multi-take files for many recordings. Adding 206 FILES to your library might sound nice, but logically organizing those 206 SOUNDS into 64 files makes SFX easier to find and edit with in your project.
Thermal Flux takes each prop recording’s various qualities and parses them down to multi-take files, so it’s easy to identify what you’re looking for and have similar takes readily available.






























John Harry (verified owner) –
These are great sound sources that are unique, and well recorded. I am using primarily in sound design, so likely layering and building sounds, but the sources here are great, and could easily stand on their own in many applications. Very cool and inspiring, and just have a general “vibe” to them that is lacking from a lot of commercial library curators these days. Thanks!
Nikolaj de Haan –
Love both my Thermal Flux and rOtation library. The metadata is rock solid – even with photos for each sound, and recordings are top quality. Currently using Thermal Flux a lot for designing mad blaze powered da Vinci inspired machines in the game Scarlet Republics
Clark Wen –
Thermal Flux is one of the best libraries I’ve heard in a while. Really unique and well-recorded sounds that you won’t find anywhere else.
Angelo Palazzo –
Wonderfully detailed and useful sound fx libraries. My favorites are Rotation and Thermal Flux, both of which I’ve used on various shows including Alita: Battle Angel and Stranger Things Season 3. They’re great source material to use for design, particularly Rotation as this library is loaded with unique movements that are often lacking in other libraries.
Luke Smiles –
Collected Transients is definitely one of my goto producers for highly detailed libraries for my sound design work. Incredible libraries like rOtation, thermal flux, combustion and machine emanation provide sounds you can’t even imagine and are absolutely perfect for bending and twisting into all kinds of sound design possibilities. And for all of the subtlety, energy and eventual destruction of an urban environment look no further than diffuse city, we are the people, along with implosion. The outstanding quality within every Collected Transients library makes them an indispensable part of my toolkit.
Fred Noel (verified owner) –
Thermal Flux and Combustion are truly infinite source material for granular synthesis. On top of that, hi res allow you to pitch down 2 octave any sounds for even more material. Top notch libraries!
Alex MacInnis –
The Thermal Flux set has been a joy to sprinkle and dash into a variety of sound design contexts, from film ambi to synth pads. The range of sample rates and overall high quality is a definite attraction. The sounds seem to be gathered with an ear to flexibility in use that I appreciate, are nicely organized, and focused in a way that at least to my brain makes a lot of sense.