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Delrin® Gears
Delrin 51HSE – A New Standard
for Plastic Gears in Automotive
and E-bike Applications
®
Newly developed Delrin® 51HSE draws on the Delrin® 100 series’ long history of setting the industry
standard for plastic gears. The Delrin® 100 series is well known for its class-leading mechanical
properties for gears; it offers light weight, high strength, durability, excellent creep performance and
low noise. Now Delrin® 51HSE demonstrates improvements that build on the core strength of
Delrin® 100 and is ideally suited for plastic gears in automotive and e-bike applications.
Delrin® 100CPE is a high-viscosity, low-emission,
high-productivity resin that is proven in highperformance gears.
Delrin® 51HSE is a high molecular weight (low
flow) nucleated resin, specially formulated for
use in applications requiring creep resistance and
fatigue durability.
The improvement in static gear strength
is about 10%, but the real benefit comes
from durability.
Fatigue Test
In a lab fatigue test, Delrin® 51HSE was tested against
Delrin® 100CPE and a high-viscosity acetal copolymer at 80°C, 30
Hz and 21.6 MPa load. Delrin® 51HSE clearly shows a significant
improvement over the comparison products.
30,000,000
Static Gear Strength Test
The chart below shows that Delrin® 51HSE has higher static gear
strength than Delrin® 100CPE. The improvement in static gear
strength is about 10%, but the real benefit comes from durability.
Cycles to failure
25,000,000
20,000,000
15,000,000
10,000,000
5,000,000
2.20
Static gear strength (kN)
2.15
Typical acetal copolymer
Delrin® 100CPE
Delrin® 51HSE
Source: DuPont
2.10
Creep Rupture Test
2.05
Delrin® 51HSE shows superior creep rupture performance versus
Delrin® 100CPE. Unlike standard creep tests, creep rupture tests
measure the time to fracture for a given temperature and strain
level. In this case, the load was 22.5 MPa at a temperature of
90°C. Delrin® 51HSE outperformed Delrin® 100CPE up to a 2X
multiple.
2.00
1.95
1.90
1.85
Delrin® 100CPE
Delrin® 51HSE
Delrin® 100CPE
Source: DuPont
Delrin® 51HSE
Gear Fatigue Test
This was validated by gear testing at 80°C, 150 rpm. In this case, the
results show the number of cycles to failure at a tooth root stress of
60 MPa. Here, Delrin® 51HSE showed a 41% improvement.
1,000,000
Creep rupture time up to 2X
900,000
Source: DuPont
Cycles to failure
800,000
In e-bike durability testing, the motor is repeatedly
stopped and started. Delrin® 51HSE endures 2.5
times more load cycles than Delrin® 100 grades
such as the 111 series normally used in this type
of application.
700,000
600,000
500,000
400,000
300,000
200,000
100,000
Delrin® 100CPE
Delrin® 51HSE
Source: DuPont
To learn more, contact your Delrin representative or visit Delrin.com.
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.
Copyright 2023 Delrin®
Form No. HMC1123