STIRRI-V4-TF Tacky Flux with Halogen Booster (ROL0)

Universal No-Clean Tacky Flux for High-Reliability Electronics Assembly

Improve solder wetting, oxide removal, and process consistency with an industrial-grade tacky flux engineered for demanding electronics applications.

✔ AIRfree™ Universal Tacky Flux
✔ HX-Booster™ Oxide-Removal Technology
✔ No-Clean, J-STD-004C Compliant
✔ Up to 250°C Lead-Free Reflow
✔ Up to 450°C Hot-Air Rework
✔ 10g & 30g Syringe Options

Designed for aerospace electronics, EV power systems, medical electronics, PCB assembly, electronics rework, and other high-reliability applications.

Reliable Soldering Performance for Demanding Electronics

When soldering performance matters, inconsistent wetting, oxidation, trapped air, and unstable flux behaviour can make the process harder to control.

STIRRI® V4-TF™ Universal No-Clean Tacky Flux is engineered to address these challenges with a high-purity rosin and advanced synthetic resin blend that provides strong tack, excellent wetting, and electrical insulation.

The improved high-boiling-point solvent system also provides enhanced stability during intense hot-air rework, while the proprietary HX-Booster™ package helps remove heavy oxides for dependable solder joint formation.

Whether you're assembling PCBs, EV electronics, aerospace systems, BMS components, power electronics, or medical assemblies, V4-TF provides a professional-grade flux solution for demanding soldering processes.

Why Choose STIRRI® V4-TF™ Tacky Flux?

Choosing a no-clean soldering flux is about more than simply reducing cleaning requirements. Consistent application, oxide removal, thermal stability, and solder joint reliability all matter.

STIRRI® V4-TF™ combines:

AIRfree™ formulation for consistent dispensing and reduced air bubbles

HX-Booster™ technology for enhanced oxide removal and solder wetting

Rosin/synthetic resin blend for strong tack and electrical insulation

High thermal stability for reflow and hot-air rework applications

Dual QC-Aid™ system for easier residue inspection

EV powertrain-ready formulation designed for demanding electronic environments

Every feature is designed to improve soldering consistency, process control, and reliability across professional electronics assembly and rework applications.

Why STIRRI® V4-TF™ Compared to Standard Flux

The Difference You Notice Immediately

Clean, Consistent Flux Application

AIRfree™ homogeneity minimizes microscopic air bubbles to support smoother dispensing, reduce splattering, and help maintain consistent application during electronics assembly.

Improve Solder Wetting & Oxide Removal

The HX-Booster™ system helps strip heavy oxides and supports effective solder wetting, helping create robust solder joints across demanding applications.

Handle High-Temperature Processes

V4-TF supports lead-free reflow temperatures up to 250°C and hot-air rework up to 450°C, providing flexibility across production and repair workflows.

Simplify Quality Inspection

The integrated Visual QC-Aid™ glows under UV light to assist residue inspection, while the Olfactory QC-Aid™ provides an additional process identification marker.

Built for Demanding Electronics

Its high mechanical-strength solder joint performance is designed to withstand demanding conditions involving vibration, G-forces, and thermal shock.

Designed for EV Electronics

The formulation is engineered to resist migration associated with intense magnetic fields found in electric vehicle powertrain environments, supporting applications such as BMS and power electronics.

Premium Features

How to Use STIRRI® V4-TF™

Using STIRRI® V4-TF™ is straightforward:

1. Prepare the PCB and components.
Ensure the soldering surfaces are ready for flux application.

2. Apply the tacky flux.
Use an appropriate dispensing method, including time/pressure, positive displacement, stencil printing, or jetting.

3. Position components and solder.
The tacky formulation helps hold components in position while promoting effective solder wetting.

4. Follow the required thermal profile.
Use an appropriate reflow or rework profile. V4-TF supports up to 250°C reflow and 450°C hot-air rework.

5. Allow full thermal activation.
Provide sufficient time and heat for the HX-Booster™ system to activate correctly.

6. Inspect the assembly.
Use the Visual QC-Aid™ under UV light where appropriate to assist residue inspection.

7. Clean before conformal coating.
Although V4-TF is a no-clean flux, cleaning is highly recommended before applying conformal coatings to promote proper surface adhesion.

Important Process Note: Because HX-Booster™ augments halogens, raw or insufficiently activated flux residue may temporarily exhibit conductivity. Proper thermal activation or a standard post-solder cleaning process resolves this condition.

Who Is It For?

STIRRI® V4-TF™ is ideal for professionals who require high-performance soldering flux for electronics assembly and rework, including:

Aerospace & Defense Engineers
For avionics, UAS, HALE platforms, and other high-reliability electronics.

EV & eVTOL Manufacturers
For battery management systems, power inverters, sensors, and high-current electronics.

PCB Assembly Professionals
For controlled soldering, dispensing, stencil printing, and jetting applications.

Electronics Repair & Rework Technicians
For demanding hot-air rework and component repair.

Medical Electronics Manufacturers
For high-density, mission-critical assemblies where contamination control matters.

Industrial Electronics Manufacturers
For production environments where reliable solder joints and process consistency are essential.

If your application demands more from your soldering flux, PCB assembly process, or electronics rework workflow, V4-TF is engineered for that level of performance.

Technical Specifications

Frequently Asked Questions

Is STIRRI® V4-TF™ a no-clean soldering flux?

Yes. V4-TF is designed as a universal no-clean tacky flux with minimal, benign residue once fully activated and is classified as J-STD-004C compliant.

What temperature can STIRRI® V4-TF™ withstand?

The formulation supports lead-free reflow temperatures up to 250°C and hot-air rework temperatures up to 450°C.

What alloys is this soldering flux compatible with?

V4-TF is compatible with lead-free alloys including SnAgCu, SnBi, and Indium/Antimony blends, as well as leaded SnPb alloys.

Can STIRRI® V4-TF™ be used for automated dispensing?

Yes. Its AIRfree™ formulation is designed to support consistent application through time/pressure, positive-displacement, stencil-printing, and jetting processes.

Is cleaning required after soldering?

V4-TF is a no-clean formulation, so routine cleaning is not necessarily required. However, cleaning is highly recommended before applying conformal coatings to support proper surface adhesion.

What happens if the raw flux residue shows conductivity?

Unactivated residue may temporarily exhibit conductivity because of the HX-Booster™ halogen system. This is resolved through adequate thermal activation or a standard post-solder cleaning cycle.

Is there a halogen-free alternative?

Yes. For a 100% halogen-free, resin-based formulation, consider the STIRRI® V4-UHF-TF™ / HX-ZERO™ alternative.

Shipping & Warranty

Processing: Orders are processed within 1–3 business days, Monday to Friday, excluding public holidays.

Shipping: Standard and express shipping options are available, with international shipping calculated at checkout.

Free Shipping: Orders over $129 AUD qualify for free standard shipping within Australia and New Zealand.

Warranty: Dialedin products carry a 12-month warranty against manufacturing defects and failure, with consumables excluded.

Get Professional-Grade Soldering Performance

When you're working with high-reliability electronics, EV power systems, aerospace assemblies, PCB production, or demanding rework, the flux you choose directly affects process consistency and solder joint quality.

STIRRI® V4-TF™ Tacky Flux with HX-Booster™ combines advanced oxide removal, strong tack, excellent wetting, AIRfree™ dispensing, high-temperature stability, and no-clean performance in one industrial-grade formulation.

Choose the size that fits your workflow and upgrade your electronics soldering process with STIRRI® V4-TF™.