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Thermaltronics TMT-FP-1 Rosin Flux Paste, 2.0 oz (57 g)
Thermaltronics

Thermaltronics TMT-FP-1 Rosin Flux Paste, 2.0 oz (57 g)

Bottom line: The Thermaltronics TMT-FP-1 Rosin Flux Paste ($5.99 on Amazon as of 2026-10-06): Works with both leaded and lead-free solder, so one can covers vintage and modern rework; main trade-off: petrolatum base leaves a greasy residue some techs still clean off anyway.

$5.99

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Buy on Amazon — $5.99 Compare to similar retro cpu coolers & fans

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Works with both leaded and lead-free solder, so one can covers vintage and modern rework
  • ✓ 2.0 oz (57 g) can lasts years at hobby volume versus tiny syringe flux
  • ✓ No-clean formula skips the isopropyl scrub after every joint
  • ✓ No Zinc Chloride or Ammonium Chloride, unlike aggressive plumbing-style pastes

Cons

  • ✗ Petrolatum base leaves a greasy residue some techs still clean off anyway
  • ✗ Wide 3-inch can is awkward next to a dispensing needle or syringe
  • ✗ Paste form is harder to place precisely on fine-pitch pads than gel flux
  • ✗ Rosin paste smokes noticeably at soldering temps, so ventilation matters

Manufacturer description

The Thermaltronics TMT-FP-1 rosin flux paste is the kind of consumable that quietly decides whether a solder joint wets properly or sits there as a cold gray blob. It is a petrolatum-based paste containing rosin, formulated for both leaded and lead-free electronics work, and it deliberately leaves out Zinc Chloride and Ammonium Chloride, so you are not dragging aggressive halide salts across a board you just repaired. Thermaltronics ships it as a no-clean formula in a 3-inch diameter by 0.62-inch tall can holding a full 2.0 oz (57 g), which is enough paste to outlast years of hobby-scale…

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SpecPicks Verdict

SpecPicks scored Thermaltronics TMT-FP-1 Rosin Flux Paste using a rating × review-volume × price-fit model applied to published specs and reviews across the retro cpu coolers & fans category. Thermaltronics's retro cpu coolers & fans lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for retro cpu coolers & fans of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Can I use this flux with lead-free solder?

Yes. Thermaltronics rates the TMT-FP-1 for both lead and lead-free applications, so the same can covers modern SAC alloys and older 60/40 or 63/37 work.

Do I have to clean the board after using it?

It is a no-clean flux, so cleaning is not required for typical electronics work. The petrolatum base does leave a visible residue, so many technicians still wipe it down with isopropyl for cosmetic or conformal-coating reasons.

How much flux is in the can?

2.0 oz (57 g), packaged in a can measuring 3 inches in diameter by 0.62 inches tall.

Is it safe for circuit boards, or is it acid flux?

It is a rosin-based electronics flux, not an acid plumbing flux. Thermaltronics states it contains no Zinc Chloride and no Ammonium Chloride, the corrosive salts that damage boards over time.

Is this RoHS compliant for professional repair work?

Yes, Thermaltronics lists the TMT-FP-1 as RoHS compliant with an SGS report. For documentation copies or shelf-life details, check the product listing or contact the manufacturer.

Key Features

  • Ideal for electronics soldering, repair & rework
  • For Lead & Lead free applications
  • Contains 2 ounces in a 3" Dia x 0.62“ H Can
  • RoHS Compliant with SGS Report
  • No Clean Flux

Full Specifications

BrandThermaltronics
Weight2.0 oz
Material‎Other
Thickness‎0.62 Inches
Part Number‎TMT-FP-1
Cutting Diameter‎3 Inches
Assembled Diameter‎3 Inches
Batteries Included?‎No
Batteries Required?‎No

Ready to buy?

Thermaltronics TMT-FP-1 Rosin Flux Paste, 2.0 oz (57 g) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $5.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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Thermaltronics TMT-FP-1 Rosin Flux Paste, 2.0 oz (57 g)
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