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Tin Bismuth Low Temperature Solder Paste

Tin Bismuth solder paste jars

Tin Bismuth solder paste jars

MPN: Qualitek Delta 670

Tin Bismuth solder paste alloy for heat sensitive components and for low temperature soldering.

Note: Currently not available for delivery to Europe Zone 3, Europe Zone 4, Europe Zone 5, Europe Zone 6, Guernsey, Jersey, Australia, Brazil, Canada, Hong Kong, Malaysia, Mexico, New Zealand & USA and India.

$43.24 ex VAT($37.92 inc VAT)
In Stock
250g Jar
$77.21 ex VAT($67.70 inc VAT)
In Stock
500g Jar
$17.30 ex VAT($15.17 inc VAT)
In Stock
10cc syringe
$29.35 ex VAT($25.74 inc VAT)
In Stock
30cc syringe

Delivery Options

Product Description

The Qualitek 670 tin bismuth solder paste has been developed for low temperature soldering. With a melting point of 138°C and a peak reflow temperature of approximately 173°C the 670 tin bismuth paste is suitable for soldering of temperature sensitive surface mount components. The 670 is a no clean solder paste. 

A eutectic Sn42 Bi58 solder alloy with a low melting point

on-corrosive clear residues

Available as a type 3 (25-45um) particle size

Available in syringes and jars


Customer Reviews

By on
"Excellent. Melting temperature as stated and solved a long-standing problem of how to connect four batteries needed for a valuable equipment."
Star Rating 5
By on
"This solder paste works brilliantly in our reflow oven and has a great consistency when pasting boards up. It easily beats alternatives we've tried from the likes of ChipQuik, etc."
Star Rating 5
By on
"I needed a very low melt solder for my Pewter projects this was just the ticket, it worked very well. The only thing that would help future purchases would be a link under the product to which size nozzle should be bought with it as i had to guess, the ones I bought were so tiny it's very hard to visualise if you have never used this product before."
Star Rating 5
By on
"Seems to be very satisfactory. Good viscosity - spreads easily across laser stencil but doesn't slump. Melts evenly and appears to give good, consistent joints. Will use again."
Star Rating 5

Reflow Profile

670 reflow profile


No Clean 670 flux
Eutectic Sn42 Bi58 alloy
Melting point 138C
Peak reflow temperature of 160 - 175C
Bellcore compliant
Tack Time: 4 - 8 hours
Processable by Reflow IR or forced convection and Vapour phase.

Somerset Solders

Leading stockist of lead free and leaded solder wires, pastes and bar. Liquid fluxes and flux gels stocked.

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