Kester 275 No Clean Lead-Free Solder 0.031 in
- 0.031 inch wire, 1 lb coil
- Lead-free Sn/Cu/Ni/Bi alloy
- No-clean flux core, 275 series
- Melting range 440 F (227 C)
- Gauge 30 as listed
Last refreshed Sep 28, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A lead-free, no-clean flux-core solder wire in a one pound coil. The listing offers little beyond alloy, melting range and diameter, so flux content and approvals are not stated.
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ASIN: B00DED97XGModel: 275Category: Solder
Overview
A lead-free electronics bench is the setting for this Kester wire, a no-clean flux-core solder in a tin, copper, nickel and bismuth alloy. It comes as a round coil.
Lead-free alloy and no-clean flux suit electronics work that avoids both lead and board washing. The limitation is missing detail: flux percentage and classification are absent, and the diameter reads slightly differently in the title and spec table.
Who it's for
Technicians who must avoid lead in assemblies and want to skip a wash step get both from the alloy and flux named here. Those who need documented flux ratings should look for a listing that gives them.
Pros and cons
- No-clean flux core
- Stated melting range
- One pound coil
- Flux percentage not listed
- Diameter rounded in spec table
- Description is a bare product string
Performance notes
Flux in the core cleans the joint as it melts, and the alloy flows once the iron exceeds the stated melting range. The no-clean flux is meant to leave residue that does not need removal.
Specifications
| Brand | Kester |
|---|---|
| Model | 275 |
| Dimensions & fit | |
| Wire diameter | 0.031 inches per title; spec table 0.03 inches |
| Item weight | 16 ounces |
| Capacity & performance | |
| Melting range | 440 F (227 C) |
| Construction & materials | |
| Material | Lead-free Sn/Cu/Ni/Bi |
| Color | Green |
| Finish | Polished |
| Other details | |
| Gauge | 30 |
| Flux type | No-clean flux core, 275 |
| Form | Coil |
Frequently asked questions
Does Kester 275 solder wire contain lead?
No. The title and description both call it lead-free.
Is Kester 275 a solder paste?
No. It is a flux-core wire supplied as a coil.
Does Kester 275 need cleaning after soldering?
The title calls it a no-clean flux core, so cleaning is not part of the described use.
What is the melting range?
The description gives 440 F (227 C).