product DATA SHEET
SikaBiresin CR77 FR
February 19, Version 01 /2021
1
product DATA SHEET
SikaBiresin CR77 FR
February 19, Version 01 /2021
1
PRODUCT DATA SHEET
SikaBiresin CR77 FR with CH77-2 Fast and CH77-4 Slow Hardeners
(FORMERLY EL-319)
EPOXY LAMINATING SYSTEM
FLAME RETARDANT, MEETS FAR 25.853 FLAME TESTING
DESCRIPTION
SikaBiresin
CR77 FR is a UV stabilized **Halogen-Free Flame Retardant Epoxy
Laminating System developed for use in fabricating parts or repairs on structures
which require flame retardant, self-extinguishing properties with room-
temperature curing capabilities (or post cure options).
SikaBiresin
CR77 FR resin is available with two hardener choices: SikaBiresin
CH77-2 Fast, a moderate work-life hardener for fast turnaround laminating of
production parts and repairs, or SikaBiresin
CH77-4 Slow, a long work-life
hardener for laminating and vacuum bagging of large parts and repairs.
**SikaBiresin
CR77 FR Resin does not contain PBDE or OBDE or DBDE
Flame retardant additive
Suitable for vacuum bagging or RTM
Applications areas include – Aerospace, transportation, architectural and
others
PROPERTIES
Low viscosity for good wet-out
Non-Halogen flame retardancy
Self-extinguishing
Two hardener choices (fast/slow)
RoHS and REACH compliant
Epoxy (non-styrene)
Excellent bond to all fabrics
TYPICAL PHYSICAL PROPERTIES
Units
SikaBiresin
CR77 FR (A)
Resin
SikaBiresin
CH77-2 (B)
Fast Hardener
SikaBiresin
CH77-4 (B)
Slow Hardener
Composition Epoxy Amine Amine
Mix ratio by weight 100 12 19
Aspect Clear Liquid Clear Liquid Clear Liquid
Color Visual Light Amber Light Amber Light Amber
Viscosity Brookfield Cps. 9,720 40 30
Viscosity Brookfield (mixed) Cps.
1,865 1,105
product DATA SHEET
SikaBiresin CR77 FR
February 19, Version 01 /2021
2
Density at 77 F (25 C) (mixed) lbs./gal (g/cc) 9.78 (1.17)
8.10 (.97) 7.94 (.95)
Pot life (200g) at 77 F (25 C) minutes 50 139
MECHANICAL PROPERTIES
MECHANICAL AND THERMAL PROPERTIES (NEAT FORM)
Property Test Method Units(s)
SikaBiresin
CH77-2 (B)
Fast Hardener*
SikaBiresin
CH77-2 (B)
Fast Hardener**
SikaBiresin
CH77-4 (B)
Slow Hardener**
SikaBiresin
CH77-4 (B)
Slow Hardener**
Hardness ASTM D2240 Shore D 87 88 87 87
Flexural strength ASTM D790 psi (MPa) 13,040 (90) 14,593 (101) 11,535 (80) 17,006 (117)
Flexural modulus ASTM D790 psi (MPa) 473,215 (3,265) 560,077 (3,864) 372,726 (2,572) 527,632 (3,641)
Tensile strength ASTM D638 psi (MPa) 7,510 (52) 9,799 (68) 7,067 (49) 10,424 (72)
Tensile modulus ASTM D638 psi (MPa) 341,734 (2,358) 349,476 (2,411) 250,994 (1,732) 309,786 (2,136)
Elongation ASTM D638 % 2.6 3.3 4.0 4.4
Tg (TMA) ASTM E1545 F ( C) 113 (45) 170 (77) 98 (38) 115 (45)
*Cure schedule: *7 day at 77 F (25 C) **24-36 hr at 77 F (25 C) + 4 hr 212 F (100 C)
Flame Retardant Properties**
Test Description Test Method Test Results
(F1) 60 second Vertical Burn Test FAR/JAR 25.853 Pass
(F2) 12 second- Vertical Burn Test Req. FAR/JAR 25.853 Pass
(F5) 30 second-45 Angle Burn Test FAR/JAR 25.853 Pass
** FAR/JAR 25.853 Appendix F, Part (a)(1)(i), (ii), (v) (4 ply 7500 Style E-Glass Laminate),
Cure schedule: 7 days/77 F (25 C). Testing done at third party laboratory.
PROCESSING
Normal health and safety precautions should be observed when handling these
products:
Ensure good ventilation.
Wear gloves, glasses and protective clothes.
For further information, please consult the Safety Data Sheets.
product DATA SHEET
SikaBiresin CR77 FR
February 19, Version 01 /2021
3
STORAGE CONDITIONS
Product shelf life of resin and hardener(s) is 24 months when stored in original
unopened containers between 65 77 F (15 25 C). Any opened can must be
tightly closed.
PACKAGING
Packaging information on request, please contact your local sales representative. or
find your local contact on www.sikaindustry.com
LEGAL NOTICE
The information, and, in particular, the recommendations relating to the application
and end-use of Sika products, are given in good faith based on Sika s current
knowledge and experience of the products when properly stored, handled and applied
under normal conditions in accordance with Sika s recommendations. In practice, the
differences in materials, substrates and actual site conditions are such that no
warranty in respect of merchantability or of fitness for a particular purpose, nor any
liability arising out of any legal relationship whatsoever, can be inferred either from
this information, or from any written recommendations, or from any other advice
offered. The user of the product must test the product s suitability for the intended
application and purpose. Sika reserves the right to change the properties of its
products. The proprietary rights of third parties must be observed. All orders are
accepted subject to our current terms of sale and delivery. Users must always refer to
the most recent issue of the local Product Data Sheet for the product concerned,
copies of which will be supplied on request.
CONTACT
UNITED STATES
Sika Corporation
30800 Stephenson Highway
Madison Heights, Michigan 48071 USA
Tel.: (+1) 248 588-2270
Fax: (+1) 248 577-0810
Website: www.sikaindustry.com