TECHNICAL DATA SHEET
PX 223 HT
February 19, Version 01 /2021
1
TECHNICAL DATA SHEET
PX 223 HT
February 19, Version 01 /2021
1
TECHNICAL DATA SHEET
PX 223 HT
POLYURETHANE CASTING / VACUUM CASTING SYSTEM
FOR TECHNICAL AND PROTOTYPE PARTS 80 SHORE D HARDNESS
DESCRIPTION
Polyurethane Casting system for use with silicone molds prototype parts and mock-ups whose mechanical
properties are close to those of thermoplastics.
APPLICATIONS
Prototype parts and mock-ups
Flexural modulus 334,000 psi
Thermoplastic aspect
PROPERTIES
Low viscosity
Fast gel time
Flexural modulus 334,000 psi
Good impact and flexural strength
248 F Tg heat resistance with post-cure
Low aggressiveness against silicone molds
PHYSICAL PROPERTIES
Handling Properties @ 77 F (25 C)
Units Part A Part B Mixed
Composition Isocyanate Polyol
Mix Ratio (by weight) 100 80 100/80
Aspect Liquid Liquid Liquid
Color Visual Colorless Black Black
Specific Gravity lbs./gal (g/cc) 9.8 (1.17) 9.3 (1.12) 9.5 (1.14) Cured
Viscosity Cps 1100 300 850
Pot Life (90 gram mass) Minutes 6 – 7
TECHNICAL DATA SHEET
PX 223 HT
February 19, Version 01 /2021
2
PROCESSING (Vacuum casting machine)
Vacuum casting into silicone molds.
Both parts have to be processed at a temperature above 65 F (18 C).
Important: Remix part B before each weighing.
Degas each part before use.
Mix for approximately 45 seconds.
Cast in a mold pre-heated at 158 F (70 C) minimum.
Allow to cure 45 to 70 minutes at 158 F (70 C) before demolding
Carry out the following postcure:
1 hr at 158 F (70 C) + 1 hr at 212 F (100 C) + 12 hr at 230 F (110 C).
NOTE : After demolding it s necessary to support the part in the oven to maintain its shape during
post cure. Ensure that the geometry or the mass of the part does not present any
deformation risk.
Typical Physical Properties @ 77 F (25 C)
(1)
Test Method Units Test Results
Color Visual Black
Hardness ISO 868 :2003 Shore D 80
Tg (TMA) ASTM E1545 F ( C) 248 (120)
Coefficient of thermal expansion ISO 11359-2 :1999 ppm/ F ( C) 64 (115)
Flexural Strength ISO 178 :2001 psi (MPa) 11,600 (80)
Flexural Modulus ISO 178 :2001 psi (MPa) 334,000 (2,300)
Tensile Strength ISO 527-2 :1993 psi (MPa) 8,700 (60)
Elongation ISO 527-2 :1993 % 11
Impact Strength Notched –
Unnotched –
ASTM D256-05
ft.- lb/in
2
(kJ/m
2
) 3 (6)
> 8 (>16)
2
Charpy impact resistance ISO 179/2D :1994 ft.- lb/in
2
(kJ/m
2
) >29 (>60)
2
Linear shrinkage in silicone mold
(250 x 50 x 3 mm)
After postcuring
% 0
Maximal casting thickness In./(mm) 0.2 0.4 (5 – 10)
(1) Average values obtained on standardized specimens / postcure 1 hr at 158 F (70 C) + 1 hr at 212 F
(100 C) + 12 hr at 230 F (110 C)
(2)
Samples tested did not break. This value represents impact energy with no fracture
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.
TECHNICAL DATA SHEET
PX 223 HT
February 19, Version 01 /2021
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STORAGE CONDITIONS
This product has a shelf life of 12 months for the resin and hardener as indicated by the
expiration date on the container when stored in original unopened containers.
Store closed containers at 65 F-85 F (18 C-29 ). Partially used containers must be flushed
with dry nitrogen and resealed. Materials are sensitive to moisture contamination.
PACKAGING
Packaging information on request, please contact your local sales representative or find your
local contact on www.sikaadvancedresins.us
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