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Welcome to Standard Heater Tube, Inc.  You’ve come to the right place if you’re a smart scientist who is ready for the finest heater tube on the planet, because that’s what we make. Here you’ll find honest information leading to smart value and the finest test coupon available today. As established over decades, we are the world’s leading producer of clean, chemically-inert heater tubes for the Jet Fuel Thermal Oxidation Stability Test (ASTM D3241).

Here you’ll find basic scientific information. There is an advantage to a tube having a good surface finish. A good finish makes for an easier task seeing and rating what is otherwise a difficult-to-see fuel deposit.  


Why Choose a Standard Heater Tube?


A Standard brand heater tube offers the benefit of our patented tube rolling process. This process makes our tube the standard throughout the industry.  


Other tubes are produced using harsh abrasive finishing processes. These begin with a coarse or raw tube containing lathe marks or tooling marks. Next, competitors add millions more abrasive scratches to their product in a so-called "polishing" step that is ironic considering that the specifications call for discarding any scratched tube. Scratches or abrasions are also undesirable because they obscure from view the subtle deposits sometimes produced during the Jet Fuel Thermal Oxidation Test, ASTM D3241. Scratches also produce a coarse, inconsistent finish, making nanometer-range deposit measurement more difficult.

Competing manufacturers try to compensate for the presence of undesirable machine marks by abrading or “polishing” raw tubes, but their harsh abrasive processes only add to the problem. By incorporating many thousands of supplemental abrasions and abrasive scratches onto the surface, these processes enhance the diffraction, diffusion, or scattering of light away from the eye of the deposit rater. The overall result is troublesome; a badly scratched or harshly abraded tube obscures deposit colors and makes deposits more difficult or even impossible to see. It should be clear to everyone that you cannot correctly rate a deposit which you cannot see. Abrasions exacerbate the already-coarse finish of competing tubes, producing an inconsistent surface that is unsuitable for delicate deposit thickness evaluations.

Standard Heater Tube, Inc. employs a non-abrasive tube finishing process. Our patented rolling process altogether eliminates abrasions, micro-abrasions, gouges, scratches, as well as additional troubling tool markings first created and then left on the tube surface by competitors. The result is a deposit image which we make easier to see, and thus easier to rate. A rolled tube doesn’t - and it can’t - change anything about the deposit; such as the amount or nature of fuel-related deposits, or the chemistry or deposition mechanism of fuels. What it does do is to make the visualization, rating, and delicate measurement of fuel deposits better and easier.

Why is a rolled tube surface important?  

Rating deposits which accumulate on a heater tube is a subjective but critical step in producing a fuel that can pass aviation fuel specifications. Currently, the rating is done visually at a relatively low 3X magnification under extreme lighting conditions. Often the deposits to be rated are the result of a fuel stain which is itself similar to a faint breath mark on a fine mirror. And, you can’t confidently rate a delicate deposit using a coarse tube when it is barely visible to begin with. That’s why a superior surface is important; it helps rate deposits better. A rolled surface, being a superior finish, lets an observer see and accurately measure what’s really on the tube instead of using imagination or guesswork to estimate a distorted deposit reflection.


A Standard Heater Tube is a product you will use with confidence.