AMACE BT1-Adhesive and Sealants

Adhesive

function by securing surfaces of two

materials together. These may be in the form of

liquid, powder, or film and may require a catalyst to

activate their adhesive properties.

Animal or fish glues

Primarily for indoor use

May be weakened by exposure to heat or

moisture.

White or polyvinyl glue

Sets quickly

Does not stain

Slightly resilient

Epoxy resins

Extremely strong

Secure both porous and nonporous

materials

May dissolve some plastics.

Will set at low temperatures and under wet

conditions.Extremely strong

Secure both porous and nonporous

materials

May dissolve some plastics.

Will set at low temperatures and under wet

conditions.

Resorcin resins

Strong, waterproof, and durable for

outdoor use

Flammable

Dark color may show through paint.

Contact cement

Forms a bond on contact and

does not require clamping.

Used to secure large sheet materials such

as plastic laminate.

Anaerobics

Harden when in contact with metal and air

is excluded

used to secure, seal and retain turned,

threaded, or similarly close-fitting parts.

They are based on synthetic resins known

as acrylics.

Do not have gap-filling capability

Cyanoacrylates

cure through reaction with moisture held on

the

surfaces to be bonded.

Usually solidifies in seconds and are suited

to small plastic parts and to rubber.

Relatively little gap-filling capability

Toughened Acrylics/Methacrylates

A modified type of acrylic

Fast-curing and offer high strength and

toughness.

Supplied as two parts (resin and catalyst),

they

are usually mixed prior to application

Tolerates minimal surface preparation and

bonds well to a wide range of materials.

UV curable adhesives

Specially modified acrylic and epoxy

adhesives, which can be cured very rapidly

by exposure to UV radiation.

Epoxies

Form extremely strong durable bonds with

most materials.

Available in one-part or two-part form and

can be supplied as flowable liquids or as

films.

Polyurethanes

Provide strong resilient joints, which are

resistant to impacts.

They are useful for bonding glass fibre-

reinforced plastics and certain thermoplastic

materials and can be made with a range of

curing speeds and supplied as liquids or

with gap-filling capability of up to 25mm.

Modified Phenolics

Adhesives for metals

Require heat pressure for the curing

process.

Plastisols

Modified PVC dispersions which require

heat to harden.

Joints are often resilient and tough.

Rubber adhesives

Based on solutions of latexes

Solidify through loss of solvent or water

Not suitable for sustained loading.

Polyvinyl Acetates (PVAs)

Suited to the bonding of porous materials,

such as paper or wood, and general

packaging work.

Pressure-sensitive adhesives

Suited to use on tapes and

labels, pressure-sensitive adhesives do not

solidify but are often able to withstand

adverse environments.

Not suitable for sustained loading.

Sealants

are products used to seal surfaces and gaps

between similar or different materials to achieve a

weather-tight environment or installation.

sealant

covers a gap required to create

a weather-tight installation.

Joint Design

match up with the sealant's

movement capabilities, practicality of placement

and aesthetics also need consideration.

Physical and chemical properties

consideration of stress /

strain, fatigue resistance

Durability properties

considerations of the adhesion properties of

the sealant to the specific substrates ad

resistance to ultra-violet radiation, moisture,

temperature, joint movement

Application / installation properties

consideration of the Application

temperature range

Latex

Used mainly in residential and light

commercial construction applications

Not used for exterior applications on high

rise construction or for applications

undergoing significant cyclic movement

Acrylic (solvent-based)

Used in residential and light commercial

construction, mainly for exterior

applications

May need special handling for flammability

Can be painted

Butyls (solvent-based)

Excellent adhesion to most substrates

Excellent weathering

Good use as adhesives in industrial and

packaging applications

Sometimes used in curtain wall applications

where adhesion to rubber compounds

is needed

May show some shrinkage after cure; may

harden and crack over time on exposed

surfaces

Polysulfides

High performance sealant chemistry;

mainly used in industrial applications

Poor recovery limits their use in joints with

high cyclic movements

Good performance in submerged

applications

Silicones

Structural bonding and stop-less glazing of

glass to frames

Excellent UV and heat stability

Good adhesion to many substrates

especially glass

Not paintable

Used in protective glazing systems and to

insulate glass to improve thermal

performance (reduce heat loss).

very low odor

Polyurethanes

Used in industrial and commercial

applications

Excellent movement capabilities

Not used in structural glazing applications

(avoid direct contact to glass)

Excellent bonding, generally without a

primer for many surfaces

FACTORY MOLDED SEALANT

1. Gaskets and seals

2. Strip-seals

3. Compression systems