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LOCTITE ECCOBOND UF 3812

Harmonization Code : 3907.30.00.90 |   Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other
Main features
  • Halogen free
  • Room temperature flow
  • One component

Product Description

LOCTITE ECCOBOND UF 3812 reworkable epoxy underfill is designed for CSP, WLCSP and BGA applications. This low viscosity material is formulated to flow at room temperature with no additional preheating required. It cures quickly at moderate temperatures to minimize stress to other components. This material's high glass transition temperature and high fracture toughness enables excellent protection of solder joints during thermal cycling.

Working with a reworkable underfill post cure will demonstrate the following:

  • The substrate has low residue after package de- bonding
  • The underfill has low adhesion to the solder mask making mechanical scraping easy
  • After cleaning, board surface is almost residue free

When we are using a non reworkable underfill on the other hand:

  • Board surface shows >50% residue after package de-bonding. De-bonding also damages the substrate
  • After cleaning, the board surface residue is 40% with 10% solder mask damage
It goes without saying that a reworkable underfill is highly preferred for applications that might require reworking at any point of their lifespan (for example repairing expensive motherboards or fine tuning already assembled parts)

Product Family
UF3812  
55cc Syringe

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.
Not Available Shipping in 8 - 12 weeks

Technical Specifications

General Properties
Specific Gravity
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.23
Pot Life
Pot Life
Pot life if the amount of time it takes for the viscosity of a material to double (or quadruple for lower viscosity materials) in room temperature after a material is mixed.

It is closely related to work life but it is not application dependent, less precise and more of a general indication of how fast a system is going to cure.
72 hours
Work life @25°C
Work life @25°C
Work life is the amount of time we have to work with a material until it is no longer able to be easily worked and applied on a substrate.

It is based on the change in viscosity and it can rely on the application requirements.
24 hours
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 @ -20°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
Viscosity 350 MPa.s
Storage (DMA) Modulus
Storage (DMA) Modulus @ 25°C 3,004 N/mm2
Thermal Properties
Glass Transition Temperature (Tg)
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
131 °C
Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE)
CTE (Coefficient of thermal expansion) is a material property that is indicative of the extent to which a material expands with a change in temperature. This can be a change in length, area or volume, depending on the material.

Knowing the CTE of the layers is helpful in analyzing stresses that might occur when a
system consists of an adhesive plus some other solid component.
Coefficient of Thermal Expansion (CTE), α1
Coefficient of Thermal Expansion (CTE), α1
CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg).

It explains how much a material will expand until it reaches Tg.
48 ppm/°C
Coefficient of Thermal Expansion (CTE), α2
Coefficient of Thermal Expansion (CTE), α2
CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg).

It explains the extent to which a material will expand after it passes Tg.
175 ppm/°C

Additional Information

Pricing & Availability

Pricing for LOCTITE ECCOBOND UF 3812

Volume Price Breaks can be seen for each product by clicking on its respective link under the DESCRIPTION column and looking to the volume price break table to the right of the product image. Price per unit is reflected in this table and used during checkout.

CAPLINQ lists all its prices without taxes, shipping payment charges or discounts. CAPLINQ has entities in Canada and the Netherlands, and if your shipping address is one of these two countries, applicable taxes will be applied.

If your shipping address is to the United States, we request your company?s Employer Identification Number (EIN) or Tax Identification Number (TIN). This is a unique 9-digit number assigned by the IRS and is required for all cross-border shipments. Failure to provide this number could result in delays to your order.

If your shipping address is within the EU, but outside the Netherlands, then we are required to request your company's Value Added Tax (VAT, BTW, MwSt) number to be able to ship the goods tax-free. For all other countries, no taxes are levied on your orders.

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Shipping Charges for LOCTITE ECCOBOND UF 3812

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Availability for LOCTITE ECCOBOND UF 3812

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