|Availability:||In stock (1)|
205 Fast Hardener is a medium-viscosity epoxy curing agent. It is useful in a majority of bonding situations, and at lower temperatures. 205 Fast Hardener produces a rapid epoxy cure that develops physical properties quickly at room temperature. Mix it with WEST SYSTEM 105 Resin in a five-part resin to one-part hardener ratio. The resulting cured epoxy is a rigid, high-strength, moisture-resistant solid. The combination of 105 Resin/205 Fast Hardener has excellent bonding and coating properties.
205 Fast Hardener is not intended for clear coating.
Pot Life at 72F (22C): 9 to 12 minutes
Cures to a solid state: 6 to 8 hours
Cures to maximum strength: 1 to 4 days
Minimum recommended temperature: 40°F (4°C)
Choose 205 Fast Hardener for Cold-Weather Bonding
We’ve formulated 205 Fast Hardener to cure well at temperatures as low as 40°F (4°C). There are several things you can do to ensure a full cure when using epoxy in low temperatures.
Pre-Warm the Resin and Hardener
Cold temperatures increase an epoxy’s viscosity, making it harder to dispense, mix and apply. Warming resin and hardener reduces their viscosity so they flow easily through their dispensing pumps. To pre-warm, place the resin and hardener containers under a warming lamp or in a warm-water bath. Pre-warmed resins and hardeners will not cling as much to your mixing equipment. They’ll also blend more easily, ensuring thorough mixing. A warmer, lower-viscosity mixture flows smoothly during application and readily penetrates porous surfaces.
Dispensing and Mixing Epoxy in Cold Temperatures
Allow the Epoxy Extra Time to Cure
Read more about Cold-Temperature Bonding in Epoxy Basics, or at Epoxyworks.
|Mix ratio by volume (300 Mini Pump ratio):||5 parts resin : 1 part hardener|
|Mix Ratio by Weight:||5.19 : 1|
|Acceptable ratio range by weight :||4.83 : 1 to 6.20 :1|
|Mix viscosity (at 72°F) ASTM D-2393:||975 cps|
|Pot life (100g at 72°F):||9 to 12 minutes|
|Working time, thin film*:||60 to 70 minutes|
|Cure to a solid, thin film* :||6 to 8 hours|
|Cure to working strength :||1 to 4 days|
|Minimum recommended temperature :||40°F (4°C)|
|*Epoxy cures faster at higher temperatures and in thicker applications.:|
|Specific gravity :||1.18|
|Hardness (Shore D) ASTM D-2240:||83|
|Compression yield ASTM D-695:||11,400 psi|
|Tensile strength ASTM D638:||7,900 psi|
|Tensile elongation ASTM D-638:||3.4%|
|Tensile modulus ASTM D-638:||4.08E+05|
|Flexural strength ASTM D-790 :||14,100 psi|
|Flexural modulus ASTM D-790 :||4.61E+05|
|Heat deflection temperature ASTM D-648 :||118°F|
|Onset of Tg by DSC :||129°F|
|Ultimate Tg :||142°F|