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CAMPUS® datasheet | CELCON GC25T


This datasheet of CELCON GC25T from Ticona is provided by the international plastics database CAMPUS.

CAMPUS is organized by a group of leading international resin producers, who have agreed to test their material according to uniform conditions, based on ISO standards (ISO 10350, ISO 11403), in order to offer comparable data to the market.

You may contact the supplier for more information about this grade.

This datasheet includes:

  CELCON GC25T | POM-GF25 | Ticona
Product Texts
Celcon® GC25T is a 25% glass fiber coupled acetal copolymer grade. It
offers higher strength than the standard Celcon GC25-A. Celcon GC25T is
FDA approved.

Chemical abbreviation according to ISO 1043-1: POM
Rheological propertiesValueUnitTest Standard
Molding shrinkage (parallel) 0.4 % ISO 294-4, 2577
Molding shrinkage (normal) 0.8 % ISO 294-4, 2577
Mechanical propertiesValueUnitTest Standard
Tensile Modulus 8630 MPa ISO 527-1/-2
Stress at break 129 MPa ISO 527-1/-2
Strain at break 3 % ISO 527-1/-2
Charpy impact strength (+23°C) 50 kJ/m² ISO 179/1eU
Charpy impact strength (-30°C) 55 kJ/m² ISO 179/1eU
Charpy notched impact strength (+23°C) 8.7 kJ/m² ISO 179/1eA
Charpy notched impact strength (-30°C) 7.2 kJ/m² ISO 179/1eA
Thermal propertiesValueUnitTest Standard
Melting temperature (10°C/min) 165 °C ISO 11357-1/-3
Temp. of deflection under load (1.80 MPa) 161 °C ISO 75-1/-2
Vicat softening temperature (50°C/h 50N) 161 °C ISO 306
Coeff. of linear therm. expansion (parallel) 27 E-6/K ISO 11359-1/-2
Coeff. of linear therm. expansion (normal) 125 E-6/K ISO 11359-1/-2
Other propertiesValueUnitTest Standard
Water absorption 0.8 % Sim. to ISO 62
Humidity absorption 0.2 % Sim. to ISO 62
Density 1570 kg/m³ ISO 1183
Test specimen productionValueUnitTest Standard
Processing conditions acc. ISO 9990 - ISO ....-2
Injection Molding, melt temperature 205 °C ISO 294
Injection Molding, mold temperature 90 °C ISO 10724
Injection Molding, injection velocity 200 mm/s ISO 294
Injection Molding, pressure at hold 86 MPa ISO 294
Diagrams
Stress-strain , CELCON GC25T, POM-GF25, Ticona
Secant modulus-strain , CELCON GC25T, POM-GF25, Ticona
Characteristics
Processing
Injection Molding, Profile Extrusion, Other Extrusion
Delivery form
Pellets
Regional Availability
Other text information
Injection molding
PREPROCESSING
Drying is generally not required because Celcon materials are not
hydroscopic nor are they degraded by moisture during processing.
Excessive moisture can lead to splay (silver streaking) in molded
parts. For better uniformity in molding especially when using regrind
or material that has been stored in containers open to the atmosphere,
recommended drying conditions are 80 C (180 F) for three hours.
Desiccant hopper dryers are not required. Max . water content = 0.35%.

PROCESSING
Standard reciprocating screw injection molding machines with a high
compression screw (minimum 3:1 and preferably 4:1) and low back
pressure (0.35 Mpa/50 PSI) are favored. Using a low compression screw
(i.e.- general purpose 2:1 compression ratio) can result in unmelted
particles and poor melt homogeneity. Using a high back pressure to make
up for a low compression ratio may lead to excessive shear heating and
deterio ration of the Celcon material.

Melt temperature: preferred range 182-199 C (360-390 F) Melt
temperature should never exceed 230 C (450 F).Mold surface temperature:
preferred range 93-121 C (200-250 F) especially with wall thickness
less than 1.5 mm (0.060 in.). May require mold temperature as high as
120 C (250 F) to reproduce mold surface or to assure minimal molded in
stress. Wall thickness greater than 3 mm (1/8 in.) may use a cooler (65
C/150 F) m old surface temperature and wall thickness over 6 mm (1/4
in.) may use a cold mold surface down to 25 C (80 F). In general, mold
surface temperatures lower than 82 C (180 F) may produce a hazy surface
or a surface with flow lines, pits and other included defects.

POSTPROCESSING
Postprocessing conditioning and moisturizing not required. It may be
necessary to fixture large or complicated parts with varying wall
thickness to prevent warpage while cooling to am bient temperature.
Other extrusion
PREPROCESSING
Drying is generally not required because Celcon materials are not
hydroscopic nor are they degraded by moisture during processing.
Excessive moisture can cause surface defects. For better uniformity
especially when using regrind or material that has been stored in
containers open to the atmosphere, recommended drying is 3 hours at 80
C (180 F). Desiccant hopper dryers are not required. Max. moisture
content = 0.35%

PROCESSING
Stan dard extruders with a length to diameter ratio of at least 20:1 are
recommended. The screw should be a high compression ratio of at least
3:1 and preferably 4:1 to assure good melting and uniform melt
homogeneity. The design should be approximately 35% each for the feed
and metering sections with the remaining 30% as transition zone.

Melt temperature 180-220 C (355-430F)

POSTPROCESSING
Postprocessing conditioning or moisturizing are not required. For thick
walled sections (>3mm or 1/8 in.), annealing is recommended to reduce
internal stresses.

Annealing temperature: 130-140 C (265-285 F)

Annealing time: 10 min/mm thickness
Disclaimer
NOTICE TO USERS: Values shown are based on testing
of laboratory test specimens and represent data that fall
within the standard range of properties for natural material.
These values alone do not represent a sufficient basis for
any part design and are not intended for use in
establishing maximum, minimum, or ranges of values for
specification purposes. Colorants or other additives may
cause significant variations in data values.

Properties of molded parts can be influenced by a wide
variety of factors including, but not limited to, material
selection, additives, part design, processing conditions and
environmental exposure. Any determination of the
suitability of a particular material and part design for any
use contemplated by the users and the manner of such
use is the sole responsibility of the users, who must assure
themselves that the material as subsequently processed
meets the needs of their particular product or use.

To the best of our knowledge, the information contained in
this publication is accurate; however, we do not assume
any liability whatsoever for the accuracy and completeness
of such information. The information contained in this
publication should not be construed as a promise or
guarantee of specific properties of our products. It is the
sole responsibility of the users to investigate whether any
existing patents are infringed by the use of the materials
mentioned in this publication.

Moreover, there is a need to reduce human exposure to
many materials to the lowest practical limits in view of
possible adverse effects. To the extent that any hazards
may have been mentioned in this publication, we neither
suggest nor guarantee that such hazards are the only ones
which exist. We recommend that persons intending to rely
on any recommendation or to use any equipment,
processing technique, or material mentioned in this
publication should satisfy themselves that they can meet
all applicable safety and health standards.

We strongly recommend that users seek and adhere to the
manufacturer's current instructions for handling each
material they use, and to entrust the handling of such
material to adequately trained personnel only. Please call
the telephone numbers listed for additional technical
information. Call Customer Services for the appropriate
Materials Safety Data Sheets (MSDS) before attempting to
process our products.

The products mentioned herein are not intended for use in
medical or dental implants.

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