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Characteristics of reactive synthetic glues

Cyanoacrylate - Epoxy - Polyurethane - Urea resin glue
(1 part)
- Urea resin glue
(2 part)

Cyanoacrylate

Applications • best used for rapidly bonding small wood and nonwood workpieces.
• not as effective when bonding highly porous materials or large surface areas.
• sensitive to joint surface conditions like pH, moisture and grime.
Availability/ using Ready to use
Typical working time # 30 sec to 5 mins, depending on volume of glue applied
Clamp time # 2 sec to 4 hrs
Cured working properties • hard to very hard;
• can be brittle;
• machines and sands well;
• resists some stains and finishes.
Cured properties • very strong and rigid;
• fair durability (when used to bond small surface areas).
Longterm properties • good moisture and heat resistance;
• poor solvent resistance and shock resistance;
• yellows and may degrade with exposure to UV light.

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


Epoxy

Applications • waterproof exterior timber;
• marine wood bonding;
• bent laminating and veneering;
• sealing;
• topcoating;
• casting;
• embedding.
Availability/ using • 2 part (resin and hardener);
• can be coloured with specialty epoxy tints.
Typical working time # 2 mins to 2 hrs plus
Clamp time # 4 mins to 48 hrs
Cured working properties • hard;
• can be cut with hand tools if warmed;
• machines and sands well; doesn't dull cutting edges as quickly as urea resin glue;
• resists stains and finishes
Cured properties • excellent combination of strength, rigidity, creep resistance and durability.
Longterm properties • waterproof;
• can be weakened, broken down by some solvents;
• fair to adequate heat resistance;
• superior shock resistance;
• may gradually degrade if exposed to UV light.

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


Polyurethane

Applications • water-resistant exterior wood bonding;
• laminating and veneering;
• bonding nonwood materials;
• develops full strength only in well-fit, tightly clamped joints;
• modern formulas cure faster than the older ones.
Availability/ using • ready to use;
• work can be moistened before applications to speed hardening;
• to prolong shelf life, squeeze air out of bottle, keep tightly capped and keep away from moisture and humidity.
Typical working time # 10 to 40 mins
Clamp time # 45 mins to 10 hrs
Cured working properties • cured foamout is soft and cuts easily with hand tools;
• machines and sands well;
• compatible with most stains and finishes
Cured properties • good strength, rigidity, creep resistance and durability;
• fills gaps but only with foamed glue (which has no structural strength).
Longterm properties • excellent moisture, solvent and shock resistance;
• superior heat resistance;
• not completely waterproof.

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


Urea resin glue (1 part)

Applications • exterior wood bonding;
• bent laminating and veneering;
• pressing plastic laminate;
• one-part ureas tend to be easier and less hazardous to use than two-part ureas.
Availability/ using • mix powder with water;
• can be coloured with dyes etc;
• can be mixed with PVA.
Typical working time # 15 to 35 mins
Clamp time # 4 to 10 hrs
Cured working properties • very hard;
• machines and sands well but dulls cutting edges quickly;
• resists stains and finishes
Cured properties • very strong, rigid and creep resistant;
• good durability.
Longterm properties • fair to good shock resistance;
• good heat resistance;
• can have excellent solvent resistance, depending on formula;
• low-grade formulas may craze, become brittle with age.

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


Urea resin glue (2 part)

Applications • exterior wood bonding;
• bent laminating and veneering;
• pressing plastic laminate;
• two-part ureas have better performance and cured properties than one part.
Availability/ using • two parts (liquid resin and powdered catalyst);
• can be coloured with dyes etc;
• can be mixed with PVA.
Typical working time # 15 to 35 mins
Clamp time # 4 to 10 hrs
Cured working properties • very hard;
• machines and sands well but dulls cutting edges quickly;
• resists stains and finishes
Cured properties • very strong, rigid and creep resistant;
• good durability;
• moderate gap-filling ability.
Longterm properties • fair to good shock resistance;
• good heat resistance;
• excellent solvent resistance, depending on formula;
• low-grade formulas may craze, become brittle with age (especially in thick bond layers)

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

 

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