Melting Range: It begins to soften at 183°C but does not become fully liquid until about 238°C.
The “Pasty” State: It has a massive plastic range of 55°C. This means it stays like thick wet slush for a long time before solidifying.
Appearance: Because of the high lead content, the finished joints are usually dull gray rather than shiny.
Wetting: It does not “wet” (spread) as easily as high-tin solders, often requiring more aggressive flux or higher heat.
| Feature | 40/60 (High Lead) | 60/40 (Standard) |
| Full Liquid Temp | ~238°C (460°F) | ~190°C (374°F) |
| Plastic Range | Large (55°C) — Very mushy | Small (5°C) — Sets quickly |
| Best For | Radiators, Sheet Metal, Glass | Electronics, PCBs, Wiring |
| Ease of Use | Harder (requires more heat) | Easiest for beginners |
| Joint Finish | Dull Gray | Bright & Shiny |
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