Kester 245 No-Clean Flux Solder 1 lb Spool
- 0.031 inch (0.80 mm) wire on a 1 lb spool
- Sn63/Pb37 leaded alloy, 1.1 percent flux core
- No-clean 245 flux, ROL0 per J-STD-004
- Bellcore GR-78 compliant
- 1.06 lb shipping weight, 2.3 x 2.75 x 2.45 inch package
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A no-clean leaded solder wire for electronics work where cleaning boards afterward is not wanted. It is leaded, so it is not for lead-free assembly.
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ASIN: B005T8XC6CModel: 245Category: Solder
Overview
An electronics assembly line that avoids cleaning boards after soldering is the target for this flux-cored wire. It is a no-clean, leaded tin-lead solder with a flux chemistry based on mildly activated rosin principles.
Low residue chemistry gives visually acceptable assemblies without a wash step, and the maker rates the soldering quality as comparable to a mildly activated rosin flux. The limitation is the lead content, plus a spec table that carries only dimensions, weight and a part number.
Who it's for
Electronics technicians who want low residue joints without a cleaning stage get a flux built for that. Anyone assembling to lead-free rules should choose another alloy.
Pros and cons
- No-clean flux chemistry
- Low residue joints
- Flux classified ROL0
- Sparse spec table
- Description mixes in other size listings
Performance notes
Low residue flux chemistry leaves visually acceptable joints without a cleaning step. The flux is designed to complement low residue liquid fluxes used in electronics, and its soldering efficiency is described as comparable to mildly activated rosin.
Specifications
| Brand | Kester |
|---|---|
| Model | 245 |
| Dimensions & fit | |
| Wire diameter | 0.031 inches (0.80 mm) |
| Spool size | 1 lb spool per title |
| Item weight | 1.06 pounds |
| Package dimensions | 2.3 x 2.75 x 2.45 inches |
| Construction & materials | |
| Material | Sn63/Pb37 leaded |
| Other details | |
| Certification | ROL0 per J-STD-004; Bellcore GR-78 compliant |
| Flux content | 1.1 percent |
| Flux type | No-clean, 245 series |
| Alloy Type | Eutectic Alloys |
| Flux % | 1.1 % |
Frequently asked questions
Is Kester 245 solder wire lead-free?
No. The description lists it as leaded, Sn63/Pb37.
Do boards need cleaning after soldering with Kester 245?
No. It is a no-clean solder, and the description says it gives visually acceptable assemblies without cleaning.
Is this a solder paste?
No. It is solder wire on a 1 lb spool.
Why does the description list other diameters?
It reproduces the 245 series table for several sizes. This listing is the 0.031 inch, 1.1 percent flux version.