ALTEK
R920 SERIES
POLYESTER RESIN
UNSATURATED POLYESTER RESIN FOR
VACUUM MOLDING PROCESSES
Typical Cast Mechanical Properties
1
Test Unit of Measure Nominal Test Method
Tensile Strength psi/MPa 12,000/82.5 ASTM D 638 /ISO 527-1
Tensile Modulus psi/GPa 522,000/3.6 ASTM D 638 /ISO 527-1
Tensile Elongation % 3.8 ASTM D 638 /ISO 527-1
Flexural Strength psi/MPa 20,500/141 ASTM D 790 /ISO 178
Flexural Modulus psi/GPa 566,000/3.9 ASTM D 790 /ISO 178
Heat Distortion
Temp.
F/ C @264 psi 203/95 ASTM D 638/ ISO 75-A
Typical Liquid Properties
2
Test Unit of Measure Nominal
Viscosity, Brookfield, LV
Spindle #1 @ 30 rpm cps 80
Styrene Content % 43
Gel Time, 100g, @ 2.0% Norox MEKP-925 minutes 43
Gel to Peak minutes 15.0
Peak Exotherm F/ C 302/150
*Typical properties are not to be construed as specifications.
DESCRIPTION
Altek R920 Series is a pre-
promoted, non thixed, low shrink-
age higher reactivity polyester resin
designed specifically for use in Vac-
uum Molding Processes such as
Infusion, SCRIMP, LRTM and CCBM.
APPLICATION
R920 Series is designed for fabrica-
tion of nacelles, rotors, nose cones
and ventilation boxes and other
composite parts.
BENEFITS
Low viscosity for fast fill time
Designed for rapid and thor-
ough wet out of glass fibers
Low shrinkage which produces
high quality surface cosmetics
Moderate exotherm
Excellent mechanical properties
featuring high flexural strength
combined with high elongation
and heat distortion temperature
resulting in a toughened com-
posite part
Note: As all Vacuum Molding Processes
are under Closed Mold Classifications,
these are “environmentally friendly”.
AOC World Headquarters
955 Highway 57 East, Collierville, TN 38017
+01 901.854.2800
AOC-Resins.com
SALES CONTACTS
NORTH AMERICA
Toll free: +1 866 319 8827
northamerica@aoc-resins.com
EUROPE
+44 1206 390415
europe@aoc-resins.com
INDIA
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india@aoc-resins.com
LATIN AMERICA
+01 863 815 5016
latinamerica@aoc-resins.com
AOC UK LTD.
+44 1206 390400
salesUK@aoc-resins.com
ASIA/AUSTRALIA
+44 1206 390415
asia@aoc-resins.com
MIDDLE EAST
+44 1206 390415
middleeast@aoc-resins.com
AOC is a registered trademark of AOC, LLC.
The information contained in this data sheet is based on laboratory data and field experience. We believe this information to be reliable, but do not guarantee its applicability to the user s process or
assume any liability for occurrences arising out of its use. The user, by accepting the products described herein, agrees to be responsible for thoroughly testing each such product before commit-
ting to production. Our recommendations should not be taken as inducements to infringe any patent or violate any law, safety code or insurance regulation. This data sheet and its contents are the
confidential and proprietary information of AOC and it may not be modified altered deconstructed or presented in any other manner without the explicit authorization of AOC and/or its legal counsel.
Altek
R920 SERIES POLYESTER RESIN
PERFORMANCE GUID ELINES
A. Keep full strength catalyst levels
between 1.0% – 2.0% (1.25% mini-
mum with mechanical application)
of the total resin weight.
B. Maintaining shop temperatures
between 65 F/18 C and 90
F/32 C and humidity between
40% and 90% will help the fabrica-
tor make a high quality part. Con-
sistent shop conditions contribute
to consistent gel times.
STORAGE STABILITY
Resins are stable for three months
from date of production when
stored in the original containers
away from sunlight at no more
than 70 F/21 C.
During the hot summer months, no
more than two months stability at
86 F/30 C should be anticipated.
After extended storage, some drift
may occur in gel time.
SAFETY
See the appropriate Material Safety
Data Sheet for guidelines.
ISO 9001:2008 CERTIFIED
The Quality Management Systems at
every AOC manufacturing facility have
been certified as meeting ISO
9001:2008 standards. This certifica-
tion recognizes that each AOC facility
has an internationally accepted model
in place for managing and assuring
quality. We follow the practices set
forth in this model to add value to the
resins we make for our customers.
FOOTNOTES
(1.) Based on tests run at 77 F/25 C and 50% relative
humidity. All tests performed on unreinforced cured
resin castings using Norox MEKP-925 Catalyst @ 1.25%.
Thixotropic components, if applicable, are excluded from
casting samples. Castings are post cured 5 hours at
100 C.
(2.) The gel times shown are typical but may be affected
by catalyst, promoter, inhibitor concentration, resin,
mold, and shop temperature. Variations in gelling char-
acteristics can be expected between different lots of
catalysts and at extremely high humidities. Pigment
and/or filler can retard or accelerate gelation. It is rec-
ommended that the fabricator check the gelling charac-
teristics of a small quantity of resin under actual operat-
ing conditions prior to use.
Pub. Altek R920 SERIES
Effective Date: May 2017
Copyright 2017