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Delrin® White Paper
Delrin CPE – A New Platform of Emissionminimized POM Homopolymers with Optimized
Processing Efficiency
®
The commercial launch of the first grades in the Delrin® CPE
family marks the inception of a completely new generation of
Delrin® POM homopolymers. These grades enable significant
reductions in emission values and mold deposits with further
efficiency-boosting application and processing advantages over
the materials previously available. Their formaldehyde emissions
of less than two ppm (measured on VDA 275 test specimens)
meet what are currently the most stringent automotive industry
requirements. The new CPE grades continue to offer the advantages typical of Delrin, such as high rigidity even in the absence of
reinforcing fibers, elevated yield point, high impact strength even
at low temperatures, creep performance and fatigue resistance.
In addition to low emissions, multipurpose Delrin 100CPE is
characterized by a wide processing window, significant
processing advantages and very high flexural fatigue strength.
The lower viscosity grade Delrin® 511CPE, produced using
proprietary crystallization technology, provides short cycle times
and high dimensional stability. Further grades are in development.
As the introduction of additional Delrin® CPE grades continues,
the family will cover a wide range of viscosities between two and
25 g/10min (MFR 190°C, 2.16 kg) and will be available in specific
modifications and colors.
Tensile modulus
100%
80%
60%
Molding
performance
Tensile strength
at yield
40%
20%
0%
Creep
performance
Charpy notched
impact strength
(23°C)
®
Formaldehyde
emission
(VDA 275)
Source: Delrin
Delrin® 100
Delrin® 100P
Delrin® 100CPE
The extremely low-emission Delrin® 100CPE (blue) has properties which
match and surpass those of previous 100 series grades (blue and orange).
Delrin® 100CPE: Low emissions with minimized
deposits
Delrin® 100CPE (MFR 190°C, 2.16 kg = 2.3 g/10min) is the
successor to the already well-established Delrin® 100 series and
aims to set a new industry standard for polymer gears and other
highly stressed applications for engineering plastics. Its particular
strength, in addition to low emissions, is a significant reduction in
mold deposits during processing. This considerably reduces mold
maintenance costs because more parts can be injection molded
between two cleaning cycles and cleaning takes less time. Pilot
testing with customers has shown that the duration of uninterrupted
production can be increased. In addition, less quality control
effort is required.
In addition to gears in automotive applications such as window
lifters or windshield wiper systems, core applications for Delrin®
100CPE also include other parts in vehicle restraint systems and
further safety-relevant components. Further applications include
general moldings for vehicle interiors including clips, springs,
levers, braces and switches and applications requiring a
combination of high productivity and high performance.
Delrin® 100
Delrin® 100CPE
Outstandingly low levels of mold deposits. Example shows condition after
21,000 shots in an accelerated test cycle with increased screw speed,
injection speed and tool temperature.
Delrin® 511CPE: Short cycle times, high dimensional
stability and fatigue resistance
Delrin® 511CPE (MFR 190°C, 2.16 kg = 14 g/10min) combines
the low emissions of all the grades in the new CPE platform with
the special crystallization technology already used in the existing
511 series. This technology enables particularly short cycle times
together with very high dimensional stability and elevated
impact strength as well as very good creep performance and high
flexural fatigue strength.
This combination of properties means that Delrin® 511CPE
surpasses the performance not only of medium molecular weight
(MMW) polyacetal copolymer grades, but also of high molecular
weight (HMW) copolymer grades. It offers a tensile strength up to
20% higher than both and impact strength around 15% higher than
that of MMW copolymer grades over a wide temperature range.
Delrin® 511CPE is suitable for all typical Delrin applications such
as clips, buckles and gears. Its distinctly higher fluidity also
facilitates filling of cavities with narrow cross-sections and long
flow paths. This permits more efficient design of thin-walled parts
and enables applications including door-lock housings or valves
and conveyor chain parts, as well as use in family and multi-cavity
molds.
Tensile modulus
100%
80%
Charpy notched
impact strength
(23°C)
40%
Tensile strength
at yield
20%
0%
Charpy notched
impact strength
(-30°C)
Yield strain
Formaldehyde
emission
(VDA 275)
Delrin® 511P
Delrin® 511DP
Delrin® 511CPE
Source: Delrin
Delrin® 511CPE’s significantly lower formaldehyde emissions require no
compromises in terms of mechanical properties.
Tensile modulus
100%
80%
Cost-efficiency gains
“The possibility of boosting productivity in the production of molded parts capable of handling high loads is a strong
argument in favor of working with Delrin,” explains Mark Hazel,
Business Development Specialist for Delrin. “Equally important,
we offer highly uniform quality, reliability of supply and comprehensive design and processing assistance, including the provision
of all relevant material data, for example for flow simulations on
the customer’s own systems. Together, these are the foundations
for producing injection moldings that reliably meet their
specifications.” As Hazel points out: “When customers take all
these factors into account from the outset, Delrin’s properties can
make a major contribution to lower component costs right from
the design stage.”
60%
Charpy notched
impact strength
(23°C)
60%
40%
Tensile strength
at yield
20%
0%
Yield strain
Charpy notched
impact strength
(-30°C)
Melt
mass-flow rate
Source: Delrin
Delrin® 511CPE
Typical MMW copolymer
Typical HMW copolymer
A comparison with typical MMW and HMW POM copolymers reveals the
general superiority of Delrin® 511CPE in terms of mechanical properties.
To learn more, contact your Delrin representative or visit Delrin.com.
The information and recommendations contained herein are offered as a service to our customers but are not intended to relieve the user from its responsibility
to investigate and understand other pertinent sources of information and to comply with all laws and procedures applicable to the safe handling and use of these
materials. The information and recommendations provided herein were believed by Delrin® to be accurate at the time of preparation or obtained from sources believed
to be generally reliable. However, Delrin® makes no warranty concerning their accuracy and Delrin® will not be liable for claims resulting from any party’s use of or
reliance on information or recommendations contained herein regardless of whether it is claimed that the information or recommendations are inaccurate, incomplete
or otherwise misleading. Caution: For medical applications, discuss with a Delrin customer representative and consult the Delrin® Medical Caution Statement.
Delrin is an industry-leading premium industrial polymer business. Grounded in strong innovation, Delrin is a category creator with a longstanding reputation
for quality, reliability, supply and product performance. The iconic Delrin brand, coupled with proprietary technology and deep application expertise make us
a leader in the high-end engineering polymer market. Delrin has exciting growth prospects from exposure to automation, actuation, healthcare, mobility and
consumer applications.
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