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 home » information » nonreactive synthetic glues

Characteristics of nonreactive synthetic glues

Ethylene vinyl
acetate (EVA)
PolyVinyl Acetate
(PVA) (white)
 
PolyVinyl Acetate
(PVA) (yellow)
 
Contact  Hot-melt

Ethylene vinyl acetate (EVA)

Applications • ideal for bonding melamine-faced cabinet parts and for gluing cross-grain solid-wood assemblies where wood movement is likely;
• can be coloured with dyes etc.
Availability/ using • ready to use
Typical working time # 10 to 15 min
Clamp time # 1/2 to 2 hrs
Cured working properties • soft and pliable;
• can be worked with hand tools; machines well; sands moderately well;
• reversible with water and/or heat;
• compatible with some stains and finishes.
Cured properties • acceptable strength but with little rigidity or creep resistance.
Longterm properties • low resistance to heat and moisture;
• fair resistance to acids and solvents;
• fair shock resistance;
• will gradually degrade if exposed to intense UV light.

# depending on glue formula, moisture content of workpieces, working temperature, atmospheric humidity etc


PolyVinyl Acetate (PVA) (white)

Applications • low grade (craft or hobby glue);
• edge- and face-gluing, bonding structural joints;
• bonding plastic laminates etc;
• can be coloured with dyes etc.
Availability/ using • ready to use;
• water can be added up to 5% to increase working time.
Typical working time # 5 to 30 min
Clamp time # 20 to 90 min
Cured working properties • fairly soft and workable;
• can be cut with hand tools, machines well but loads paper when sanded;
• reversible with water for 2 to 6 weeks after curing;
• resist stains and finishes
Cured properties • adequate strength;
• low rigidity and creep resistance;
Longterm properties • low to moderate resistance to heat, moisture, acids and solvents and good shock resistance;
• will gradually degrade if exposed to UV light.

# depending on glue formula, moisture content of workpieces, working temperature, atmospheric humidity etc


PolyVinyl Acetate (PVA) (yellow)

Applications • high grade (professional/ industrial glue);
• edge- and face-gluing, bonding structural joints;
• bonding plastic laminates etc;
• can be coloured with dyes etc.
Availability/ using • ready to use;
• water can be added up to 5% to increase working time.
Typical working time # 5 to 30 min
Clamp time # 20 to 90 min
Cured working properties • cures hard;
• can be cut with hand tools, machines well but loads paper when sanded;
• can be softened or reactivated with heat up to several days after application;
• not reversible with water after curing;
• resist stains and finishes.
Cured properties • greater strength, rigidity, creep resistance and durability than white PVA.
Longterm properties • greater resistance to heat, moisture, acids and solvents and very good shock resistance;
• will gradually degrade if exposed to UV light.

# depending on glue formula, moisture content of workpieces, working temperature, atmospheric humidity etc


Contact

Applications • bonding plastic laminates;
• decorative overlays;
• other rigid sheet materials;
• some modern water-based cements are fast drying and give high performance;
• applying significant pressure to the work greatly increases the strength of the bond.
Availability/ using • ready to use
Typical working time # dry prior to assembly;
open drying times:
10 to 20 min (water based),
2 to 15 min (solvent based),
Clamp time # 1 to 5 min will increase bond strength
Cured working properties • soft and elastic;
• can be machined and sanded but will gum up cutting edges and sandpaper;
• may be softened by solvents (may be affected by solvents in stains and finishes.
Cured properties • initially very weak;
• develops increased strength when pressed into thin layer;
• no rigidity;
• little or no creep resistance.
Longterm properties • good to excellent heat resistance if pressed into thin layer;
• poor to fair moisture resistance if subjected to prolonged exposure;
• poor solvent resistance.

# depending on glue formula, moisture content of workpieces, working temperature, atmospheric humidity etc


Hot-melt

Applications • hot-melt glues and guns are available with high, low or dual melt-point glue;
• high-melt systems widely available/used;
• low-melt systems are safer and less likely to harm the materials being glued;
• hot melt is useful for edge-banding sheet material and for the rapid assembly of temporary fixtures.
Availability/ using • supplied in solid sticks;
• must be applied hot;
• low-melt glue shouldn't be applied with a high-melt gun.
Typical working time # 5 to 30 sec,
longer if parts preheated
Clamp time # No clamping needed; firmly press parts together as quickly as possible
Cured working properties • soft and elastic;
• can be cut with hand tools when hardened;
• machines and sands adequately but can gum up cutting edges and sandpaper;
• reversible with heat;
• may be softened or dissolved by some stains and finishes.
Cured properties • very low strength, unsuitable for permanent structural bonds;
• increased strength if pressed into thin layer before it cools;
• limited rigidity and creep resistance;
• some gap-filling ability.
Longterm properties • good moisture resistance;
• no heat resistance;
• poor solvent resistance;
• poor to fair shock resistance;
• will gradually degrade if exposed to UV light.

# depending on glue formula, moisture content of workpieces, working temperature, atmospheric humidity etc

 

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