WEST
* G/flex Epoxies
General Description
Te chn i c: al G/flex Epoxies are toughened, resilient two-part epoxies engineered for a superior grip to
metals, plastics, glass, masonry, fiberglass, and wet and difficult-to-bond woods. G/flex
D t Sh t Epoxies are available in two consistencies. G/flex 650 Epoxy is a liquid epoxy with a honey-
ALA ONEET ike consistency. G/flex 655 Epoxy Adhesive is pre-thickened with a consistency similar to
gel toothpaste. Both have an easy-to-use 1:1 mix ratio. G/flex provides a relatively long open
working time, yet it cures quickly and can be used in cool temperatures.
G/flex Epoxies are toughened to make them resilient and impact resistant, giving them the
ability to make structural bonds that can absorb the stresses of expansion, contraction,
S p ec i alty shock, and vibration. With a modulus of elasticity of 150,000 psi, G/flex is more flexible and
. can deflect further before breaking than WEST SYSTEM 105/205, while being much stiffer
Epoxies than typical adhesive sealants.
G/flex adheres tenaciously to difficult-to-glue hardwoods, both tropical and domestic
G / fl ex varieties. It can be used to bond metals, plastics, glass, masonry, and fiberglass. G/flex is
ideal for repairs to aluminum boats and polyethylene and ABS canoes and kayaks. It can
also be used to wet out and bond fiberglass tapes and fabrics. G/flex 650 can be modified
with WEST SYSTEM fillers and additives and added to other WEST SYSTEM epoxies to
improve their toughness and flexibility.
Handling Characteristics
Mix Patho Wy VONIIE .scsssevissssoeasssceasssececessenerseseneeceneseentsenseseesscstssstsneatneasstssuruszsscessssccsssse TEM
by Weight ……sscccssssssssssssusnssessnnsnnsnnsseseessuunsnnnseessiunesseesunnnnnnneseeeesnenseseseeserenssees L2tL
Mix viscosity G/flex 650 (at 72 F) ASTM D-2393 -……-s+ssssssssssseeeseeesseeesseee15,000 CPS
MG [LEK 655 sscesescsssaransceassassrecesssssssssssasersasssassssastesseuercuusn snes aniacatsttseittarmtctence cone BEM
Pot life (100g at 72 F) …..sssssssssssssssssessseeeeeeseseeeeeeeseeeeeeeseeeeeeeettunteneeeeeeeee 45 Minutes
a Tod
Tnnitial CONG sesssissssevseesissesssssinssststitsisss cess Nese NASA ARINC cacacaTcaes SG tO 4 BOUTS
Workable cure ……sssssescssessssssseeessnsseessssneeessnsesssneeessneeeessneeesensmnessneesssaneeessnees 7 CO. 10 hours.
Minimum recommended temperature ……….-cssssssssesessesseesssssnssnesesseessssetenseeees GO F (4 C)
*Wait 24 hours before subjecting to high loads.
Physical Properties of Cured Epoxy
Specific gravity……cssssecssssssssssssssssssnsssssssesssssssessssessessesssssseesssseeesseessesseeeseseseeeeeesseneeeseeeeeeeseee HL
Hardness (Shore D) ASTM D-2240….cccssssssssssssssssssssssssesssssesssssssssseesesssseesseseseseeessenssenseeseee 75
Compression yield ASTM D-695..s:sssussusseuenetusueninsieneussusnenienenaeiene 5:270 PSi
Tensile strength ASTM D638 …ssssssssssssssessssseeseeeeeesnssssssesesinseeeesseesnnsssssssssesssses 39440 PSI
Tensile elongation ASTM D-638 ……sssssssssssssssssssssssessssssssssssessesssesessssesesssesseeessesteeees 322790
Tensile modulus ASTM D-638 -ssssssssssssssssssssuessssseessesuusssssssenssssssesssssssssssees L4GE+05 pSi
Flexural strength ASTM D-790 …….ssssssssssssssssesssssnesseseesssssnsssessesssssssnsseseesssssssssesees 5,190 DSi
Flexural modulus ASTM D-790..s++++sssssssssssseeseeeesssinsssessessmnsseeeessssnnsssssssseessssssse LSOE+O5
Heat deflection temperature ASTM D-648 ….sssssssssssessssssssseesersssssssseeeeseessessnneeeeee 27 F
Onset of Tg by DSC…sssssssssssessssesssssssssuunssnnssssseesssuusneseesesusnsesseessensssesseeeesannsseesseeens ZOE
Ultimate Tg …..sssssssssseeessssssnsssssssssnnssssssseesenesssnssnsnsnnansnanannsnsnnssessseeessncenssencessssessesessssessesene] 54 F
Storage/Shelf Life
Store at room temperature. Keep containers sealed when not in use to prevent
contamination. With proper storage, resin and hardener should remain usable for several
years.
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