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Nea t90 in EPDM Windo w and Door Seal Application

Neat90
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Te chnica l Bullet in:
Nea t90 in EPDM Windo w and Door Seal Application
Objective
To formulate an EPDM recipe using Neat90 to replace all or a portion of N-550 and yieldcomparable qualities to that of a recipe using only N-550 while simultaneously improving thesustainability and economics of the compound.

Background
Injection and/or extruded rubber articles require compounds with certain special processing
characteristics. Most notable of the processing characteristics is the requirement for a
combination of low viscosity and sufficient scorch times to allow the rubber to be injected into
the mold or extruded in a relatively short time to minimize cycle time, and still maintaining thebenefits of smoother surfaces, better dimensional stability, and improved green strength.
This study was conducted and focused on the advantage of utilizing the Neat90 in combination
with the semi-reinforcing ASTM grade N-550 carbon black (N550 has low surface area and highstructure). Neat90 used was 20% oil treated to eliminate dust and to insure good dispersion, andconsistency. The compound containing Neat90 results in improved green strength, gooddimensional stability. And reduce the cost per pound volume while still maintaining good toexcellent physical properties.

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Nea t90 i n EPDM Windo w and Door Seal App licat ionFormulas and Testing:• Formula #NB70XEPCN101S-CN90 was prepared for this study using:• One cure system; Sulfur• Two different filler levels; The Control w/Carbon Black and #NB70XEPCN101S-CN90
w/Neat90• Batches were mixed on a two-roll mill (6 lbs batch wt. capacity) using a step-by-stepmixing procedure.
• Compound formulations were developed specifically for window and door seal with aDurometer target of 70 +/-5
The following testing was performed using ASTM procedures:• MDR (Rheometer) ML, in/lb. (low torque)MH, in/lb. (high torque)TS2 (minutes) (Delay of cure at 2 min.
T90 (minutes) (cure at 90%)
••
•
•
•

Original physical properties; ASTM D-412 tested at room temperature (70˚F ~ 75ºF)
Die C tear; ASTM D-624 tested at room temperature (70˚F ~ 75ºF)
Compression set; ASTM D-395 Method B tested at 22hrs and 70hrs at 100˚C (212˚F)
Heat Aging; ASTM D-573, tested at 70hrs and 168hrs at 100˚C (212˚F)
Volume resistivity

Note –• Slabs were molded for 20 min. at 340˚F. pre-conditioned for 8hrs ~ 16hrs at room
temperature prior to testing.
• ½” buttons for compression set test were molded for 23 minutes at 340˚F
Testing was performed at:Carbon Research and Development5934 Windswept Blvd.
Wise, VA 24293
Guided by an industry veteran team, the Carbon Research and Development Company specializes
in custom rubber compounds development and high-tech formulation design specifically tailored toour customer's specific needs and requirements. We serve the OEM and after marketplace in a wide
variety of industries, including but not limited to:
Automotive• Commercial Electronics• Food/Water Handling• Fluid Power•

w w w . c a r b o n n e a t . c o mIndustrial Controls• Military and Aerospace• Medical• Agriculture & Construction•

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Neat90
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Nea t90 i n EPDM Windo w and Door Seal App licat ion
Table 1

MATERIAL P/NControl
EDPM N550 Sulfur Cure

#NB70XEPCN101S-CN90
EDPM N550 / Neat90 Sulfur Cure

Royalene 512

98.47

98.47

R153-70

9.30

9.30

N-550

80.00

55.00

Neat90

0.00

30.00

Zinc Oxide, AZO 66T

5.00

5.00

Flectol TMQ

3.00

3.00

Polyethylene 617A

1.00

1.00

Stearic Acid

1.00

1.00

SUNPAR 2280

38.00

30.00

Spider Sulfur

2.50

2.50

Perkacit MBT-Pdr,-D

1.80

1.80

Sulfades (DPTT)

0.80

0.80

CaO

0.50

0.50

TOTAL formula wt.

241.37238.37

The formulation #NB70XEPCN101S-CN90 listed above in table 1 was developed considering
the following Major Requirements Of Extrusion Grades:
••••
•
•

Economical
Easy to mix and extrude
Good visual appearance
Good green strength
Smooth processing and preforming
Dimensional stability and consistency

Importance In Extruded Products
After the polymer, fillers are the most critical material in an extrusion recipe.
The proper grade selection is very important. By incorporating Neat90 with the N550 carbon
black at the proper level has many benefits, such as; improve batch-to-batch consistency,
improve surface appearance, improve processing, improve hot tear resistance, lower costs due
to scrap reduction, and can reduce defects in thin walled applications.

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Neat90E N G I N E E R E D

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Nea t90 i n EPDM Windo w and Door Seal App licat ion
Table 2
Rheometric ProperZes @160°C

Control
EPDM N550 Sulfur(20 min Cure)#NB70XEPCN101S-CN90
EPDM N550 / Neat90 Sulfur(20 min Cure)

ML, in/lb.

1

1.01

MH, in/lb.

10.02

12.49

TS2 (minutes)

0.7822

1.1

T90 (minutes)

7.91

8.2

The Rheometric properties (table 2)
Compound #NB70XEPCN101S-CN90 shows excellent viscosity (ML), material can easily inject /extrude. Processing safety (Ts2) providing enough time to fill the cavities without scorching.
Based on both factors, #NB70XEPCN101S-CN90 should have excellent visual appearance and avery smooth surface.

Table 3
VulcanizaZon ProperZes
ASTM D-412

Control
EPDM N550 Sulfur(20 min Cure)#NB70XEPCN101S-CN90
EPDM N550 / Neat90 Sulfur(20 min Cure)

Durometer (Shore A)

71

69

300% Modius

1176

1091

Tensile Strength2183.28

2099

ElongaIon at Break (%)

697.74

667

Tear Strength (kN/m) Die C

54.65

45.15

.Vulcanization Properties (table 3)
Compound #NB70XEPCN101S-CN90 exhibited good and acceptable data suitable for auto
window and door seals. Sulfur cured Control and #NB70XEPCN101S-CN90 exhibit similar 300%
Modulus, Tensile strength, and Elongation % with slight reduction in compound#NB70XEPCN101S-CN90 Elongation and Tear strength which most specifications accept andsupport.

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Nea t90 i n EPDM Windo w and Door Seal App licat ionTable 4
Compression Set (%)
ASTM D-395
Method B

Control
EDPM N550 Sulfur(20 min Cure)#NB70XEPCN101S-CN90
EDPM N550 / Neat90 Sulfur(20 min Cure)

22 hrs. @ 100°C (%)

17.04

17.17

70 hrs. @ 100°C (%)

20.22

20.00

Compression Set (table 4)
The 22hrs & 70 hrs. /100˚C Compression set in both; Sulfur cured Control and compound#NB70XEPCN101S-CN90 show equal values.

Table 5Control
EDPM N550 Sulfur(20 min Cure)#NB70XEPCN101S-CN90
EDPM N550 / Neat90 Sulfur(20 min Cure)

Durometer Change, Points

24.5

Tensile Strength Change %

10.71

-8.27

ElongaIon Change %-18.13-18.59Durometer Change, Points

10Tensile Strength Change %

10.05

-5.61

ElongaIon Change %-23.45-24.05Heat Aging ProperZes (%)
ASTM D-573
70 hrs. @ 100°C (%)

168 hrs. @ 100°C (%)

Heat Aging Properties (table 5)
The 70hrs/100˚C heat aging, shows acceptable hardness change in both compounds with slightdecrease in Tensile values with compound #NB70XEPCN101S-CN90 which is acceptable bymost window and door seal specifications. Elongation change for Control and#NB70XEPCN101S-CN90 are similar.

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Neat90
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Nea t90 i n EPDM Windo w and Door Seal App licat ion
Table 6
Volume ResisZvity

Control
EDPM N550 Sulfur Cured#NB70XEPCN101S-CN90
EDPM N550 / Neat90 Sulfur Cured

Thickness of disk (mm)

2.102

2.046

Specimen Diameter (mm)9898

ResisIvity (Ωcm)

1.28983E+07

3.58927E+07

Volume Resistivity (table 6)#NB70XEPCN101S-CN90 shows excellent volume resistivity over N-550.
Table 7

MATERIAL P/NControl
EDPM N550 Sulfur Cure

#NB70XEPCN101S-CN90
EDPM N550 / Neat90 Sulfur Cure

Speciﬁc Gravity

1.08

1.07

Cost/Lbs.

1.570

1.527

Cost/Lbs. volume cost

1.696

1.634

Conclusion• Compound NB70XEPCN101S-CN90 consists of 12.5% Neat90 proving that a bio-based renewablefiller can yield good to excellent results.
•Compound #NB70XEPCN101S-CN90 has acceptable physical properties and demonstrated
improved cost per pound volume improvement. In addition, #NB70XEPCN101S-CN90 showed
good dispersion.

•Compound #NB70XEPCN101S-CN90 shows superior compression set results, making it ideal for
sealing applications.

•Neat90 offers a new balance of properties and excellent tolerance when blending with traditional
carbon black materials, particularly with N-550.
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Neat90
E N G I N E E R E DSTLES“DUS IONSVER
INGMOCN!!
SOO

B I O - F I L L E R”

E las t om e r s-

P las t ics-Paints-

Coa tings-

Co nc re te

Neat90 ; a renewable amorphous carbon material derived from sustainable biomass
feedstock utilizing a proprietary, C0 2 neutral, auto-thermic technology.

Characteristic

Target

Units

ASTM

DBP Absorption

74

cm3/100g

D 2414 B

Iodine Adsorption> 145g/kg

D 1510

Moisture (as packaged)< 2.5%

D 7582Ash (dry)< 3.0%

D 7582

Fixed Carbon (dry)> 91.0%D 7582

pH9 - 10——

D 1512

Bulk Density

544kg/m3——

Pour Density

338

——

D 1513Specific Gravity

1.2

——

D 792-13

PAHs

Non-detect

5 ppb

——

Particle Size (D50)

5.5µm

——

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