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LOCTITE GC 18

Harmonization Code : 8001.20 | Unwrought tin: Tin alloys

Main features

SAC 305 - No refrigeration
Low voiding
Stencil Printable

Product Description

LOCTITE GC 18 is a halogen free, no-clean, low voiding, Pb-free, SAC305 solder paste specially formulated to provide low voiding when soldering Bottom-Terminated Components (BTC- QFN, DPAK and LGA). This material is a room temperature paste, designed to enhance stability in stencil printing applications.

LOCTITE GC 18 offers less than 25% voiding across small and large BTC with an IPC Class III voiding for BGA/CSP. It has good resistance to graping (the appearance of unreflowed solder particles on top of the solder mass) in demanding reflow profiles, excellent humidity resistance and minimal slump at room temperature and up to 190°C.

LOCTITE GC 18 offers stable on-stencil viscosity for improved printing consistence and great reliability, passing SIR and ECM independent of reflow profiles. It leaves pin-testable post-reflow residues after four reflow cycles, is compatible with approved encapsulant technologies and RoHS and EICC compliant.

Technical Specifications

General Properties

Alloy Type

Alloy Type
A metallic element type

SAC305

Metal Loading
Copper (Cu) Copper (Cu) Copper is a soft malleable and ductile metal with a very high thermal and electrical conductivity.	0.5 %
Silver (Ag)	3 %
Tin (Sn)	96.5 %

Shelf Life Shelf Life Shelf life is the amount of time after manufacturing that a product is guaranteed to retain its properties. It differs vastly per product and it is based on temperature and storage conditions. The properties can be guaranteed for the temperature and time range indicated on the TDS since those are the ones tested to be the best for the product.
Shelf Life @ 25°C	180 days

Mechanical Properties

Viscosity Viscosity Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
Thixotropic index Thixotropic index Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten. A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads. It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.	0.5
Viscosity	250000 mPa.s