TECHNICAL DATA SHEET
EC-433
February 19, Version 01 /2021
1
TECHNICAL DATA SHEET
EC-433
February 19, Version 01 /2021
1
TECHNICAL DATA SHEET
EC-433
HIGH TEMPERATURE EPOXY CASTING SYSTEM
ALUMINUM FILLED
DESCRIPTION
EC-433 aluminum filled epoxy casting systems are developed for use in heat resistant tooling applications such as
prototype injection molding, vacuum forming, and other high temperature cast tooling applications. EC-433 offers 3
hardener options with various working times, suitable for any tool size. EC-433 is a room temperature hardening (B
Stage) system, but a post cure is necessary for use over 150 F (66 C). Tools made with EC-433 can be used at
continuous temperatures of 300 F (160 C) and intermittent temperatures up to 350 F (177 C). EC-433 features easy
mixing, accepts higher loading of bulk aluminum, and exhibits greater dimensional stability.
APPLICATIONS
Vacuum Form Molds
Compression Molds
Prototype Injection Moldings
RIM Molds
Foam Molds
Other High Temp Cast Applications
TECHNICAL DATA SHEET
EC-433
February 19, Version 01 /2021
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PROPERTIES
PROCESSING
RECOMMENDED CURE SCHEDULE
PRELIMINARY CURE:
24 hours @ 77 F (25 C) + 3 hours @ 150 F (66 C) is the minimum cure temperature
You may de-mold tool after the preliminary schedule is complete and the tool has cooled.
POST CURE SCHEDULE:
A conditioning post cure at a temperature equivalent to the constant operational temperature of your production mold is
advised. If an additional post cure is necessary beyond the preliminary cure schedule, the recommended cure schedule is
as follows:
2 hours @ 200 F (93 C)
2 hours @ 250 F (121 C)
2 hours @ 300 F (149 C)
Ensure proper heat curing temperatures are met by installing a thermocouple directly in the center of the tool.
Notes: It is always advisable to heat cure cast epoxy molds internally by using the copper tubing temperature control
system built into your mold.
***If oven curing is your only option, it is advisable to complete the initial cure on the model at 125 F (52 C) for 8 hours
or overnight before reverting to the higher post cure temperatures outlined above.
TECHNICAL DATA SHEET
EC-433
February 19, Version 01 /2021
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***Extremely large cast molds should always be heat cured internally and not moved or transported prior to
completing an internal heat cure process of 150 F (66 C) minimum.
***Always allow a cast tool to cure 24hrs at room temperature before heat cure. This will prevent excessive exotherm and
shrink stress from occurring.
***When taking cast tools through a preliminary or post cure phase always place tool in a room temperature oven and
increase temperature at a rate of no more than 50 F (30 C) per hour.
***When cooling cast tools, always allow tool to remain in heat environment and decrease temperature at a rate of no
more than 50 F (30 C) per hour. Do not remove tool from heat environment until center of tool has reached 100 F (38 C)
or less. Removing tool at temperatures above 100 F (38 C) can result in thermal shock and warping.
Infused laminate – Carbon fiber, 3K plain weave, 8 layer, 0-90 rotation, 37% resin content
*1hr/50 C + 1hr/80 C + 2hr/120 C + 4hr/150 C cure **1hr/60 C + 1hr/80 C + 2hr/120 C + 4hr/180 C cure
HANDLING PRECAUTIONS
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.
STORAGE CONDITIONS
This product has a shelf life of 12 months for the resin as indicated by the expiration date
on the container when stored in original unopened containers between 47 F 77 F (8 C
25 C). The product shelf life for the hardener is 24 months between 60 F (15 C) and
77 F (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.sikaadvancedresins.us
TECHNICAL DATA SHEET
EC-433
February 19, Version 01 /2021
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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
E-mail: advanced.resins@us.sika.com
Website: www.sikaadvancedresins.us