RASC698 Acetal Resin for Healthcare Devices
Delivering Low Friction for Smooth, Precise Actuation and Injection Performance
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Delrin® Product Sheet
Delrin® Renewable Attributed RASC698
Acetal Resin for Healthcare Devices
Delivering Low Friction for Smooth, Precise Actuation and Injection Performance
Delrin® Renewable Attributed RASC698 base polymer is produced
from certified sustainable resources and under special control for
medical grade applications. It contains 100% bio-feedstock from
waste and is accredited through the International Sustainability
and Carbon Certification (ISCC) mass balance certification system.
It delivers top-class mechanical properties with reduced lifecycle
greenhouse-gas emissions and lower fossil resource use.
Low coefficient of friction
Delrin® RASC698 acetal resin incorporates a lubricity
additive and features the lowest coefficient of friction (COF) in
the company’s expanded portfolio. Low COF—when moving
against itself and other materials—helps Delrin® RASC698 resin
provide smooth, easy actuation for drug delivery devices like
inhalers, injectors and pumps. Patients can benefit from
reduced effort, increased comfort, dosing accuracy and
consistent operation. Designers and manufacturers can depend
on Delrin® RASC698 for a smooth surface and good colorability.
Delrin® RASC698 resin can also help to improve precise positioning
of wearable patches and minimize discomfort when inserting
pump connectors by enabling the use of smaller springs.
Miniaturization without
sacrificing performance
This highly crystalline homopolymer’s strength, stiffness and
fatigue resistance, combined with its ultra-low COF, deliver
excellent wear properties over time and repeated use. Its high
impact resistance helps protect against damage from drops.
For device OEMs, the strength, rigidity and dimensional stability
of Delrin® RASC698 resin can allow the manufacturing of
thin-wall, complex and miniaturized designs without sacrificing
performance.
Lower global warming potential
Delrin® RASC698 supports our customers’ sustainability goals with:
• Base polymer produced from 100% certified bio-feedstock
from waste (ISCC mass balance)
Pictured: insulin pumpable patch device with moving internal components
The medical device industry continues to innovate with
wearables devices that are making home-care and selfadministration more convenient for patients. The unique
characteristics of Delrin (lubricity, toughness, stability) play
a key role in the success of moving internal components
for these devices.
What is SC?
The SC designation in Delrin® RASC698 stands for special
control. SC resin grades experience a high amount of
testing, and offer a great degree of manufacturing control
and broad regulatory compliance.
• Manufactured according to Good Manufacturing
Practice (GMP)
• Acquired food contact statements
• Testing against selected parts USP Class VI
• Testing against relevant parts ISO 10993
• Sterilization data
• Global availability
Features
• Ultra-low coefficient of friction
• High tensile strength and stiffness
• Excellent creep resistance and dimensional stability
• High fatigue resistance and impact toughness
• Good colorability
• Attractive surface finish compared to other
friction-modified grades
• Sterilizable*
*Not suitable for gamma irradiation and E-beam technology
• 67% lower product cradle-to-gate carbon footprint
Benefits
• Reduction of non-renewable fossil resource usage
• Smooth, precise actuation of high-load devices
for easier patient operation
• Excellent wear/friction performance and durability
• Attractive aesthetics that appeal to patients and
encourage use
• Expanded freedom to design thin-wall and complex parts
• System cost reduction through high-volume injection
molding
• Avoids need for external lubrication of components
Thanks to the mass balance approach, Delrin® RASC698 offers
the same superior performance and quality as Delrin® SC698
with a lower global warming potential (GWP). (A three panel peer
reviewed Life Cycle Assessment (LCA) was conducted on the
Delrin® RA product in accordance with ISO 14040/14044.)
Comparison
of SlideX
Delrin® RASC698 with low friction POM copolymer
Delrin SC698 with
competitive
100%
Coefficient of friction against itself
Melt mass-flow rate
0.3
Delrin® RASC698
75%
Tensile modulus
50%
25%
0%
Stress at yield
Sliding performance
Coefficient of friction
Surface aspect
Low friction POM copolymer
0.2
0.1
Stress at break
Delrin® RASC698
COF after 15s
Delrin SC6 90
Low friction POM copolymer
®
Target Applications
• Drug delivery devices
• Patch/connector inserters
Average COF after 2 min
Target Customers
• Gear systems
• Wearables
• Medical device OEMs
• Device designers
• Injection molders
• Pharmaceutical OEMs
Delrin® RASC698/SC698 properties
Properties
Value
Unit
Test method
Mold shrinkage, normal
1.8
%
ISO 294-4, 2577
Tensile modulus
MPa
ISO 527-1/-2
Yield stress
MPa
ISO 527-1/-2
Yield strain
%
ISO 527-1/-2
Nominal strain at break
%
Charpy impact strength, 23°C
Charpy impact strength, -30°C
ISO 527-1/-2
kJ/m
ISO 179/1eU
kJ/m
ISO 179/1eU
Charpy notched impact strength, 23°C
kJ/m
ISO 179/1eA
Charpy notched impact strength, -30°C
kJ/m
ISO 179/1eA
Poisson’s ratio
0.37
-
Melting temperature, 10°C/min
°C
Thermal conductivity of melt
0.22
W/(m K)
Spec. heat capacity of melt
J/(kg K)
ISO 11357-1/-3
For complete data visit Delrin® Material Data Center at https://delrin.materialdatacenter.com
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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