Manufacturing Industry
Sealing with TPV
Rubber World, Oct, 2008 by Ward E. Narhi
Table 1--typical compression force
retention from 0 to 30 minutes *
Force retention
from 0 to 30
Santoprene minutes
TPV grade compression
111-35 69%
101-55 62%
101-64 57%
101-80 55%
121-58W175 60%
121-67W175 58%
* Injection molded buttons 6.2 mm (0.24") thick,
13 mm (0.51") diameter, Elastocon continuous stress
relaxometer
Table 2--typical compression stress
relaxation data * one week at 23[degrees]C
(73[degrees]F) 100 (Ft/Fo) = A-B [Log (t/to)]
Estimated
residual
force after
Santoprene TPV A B 10,000 hrs.,
Molding grades percent
111-35 97.6 8.8 60
111-45 97.5 8.2 62
General purpose grades
101-55 96.1 8.6 59
101-64 94.6 8.6 58
101-80 92.3 10.6 47
Extrusion grades
121-58W175 95.4 10.4 51
121-67W175 94.8 9.3 55
121-73W175 97.9 12.8 43
* 6.2 mm (0.24") thick/13 mm (0.51") diameter button,
25% compression, method ISO 3384; Elastocon continuous
stress relaxometer
Table 3--typical compression stress
relaxation data* at 70[degrees]C or 80[degrees]C
100 (Ft/Fo) = A-B [Log (t/to)]
Residual
force after
2,500 hours,
Santoprene TPV A B percent
General purpose grades
(70[degrees]C [158[degrees]F])
101-55 (12,000 hrs.) 98.5 4.5 82
101-64 (17,000 hrs.) 98.3 6.7 74
101-73 (22,000 hrs.) 98.3 7.7 70
101-80 (340 hrs.) 98.9 6.5 75 (est.)
Extrusion grades
(80[degrees]C [176[degrees]F])
121-58W175 (3,000 hrs.) 96.4 7.1 70
121-67W175 (168 hrs.) 99.8 7.2 73 (est.)
121-73W175 (3,000 hrs.) 99.6 6.3 76
* 6.2 mm (0.24") thick/13 mm (0.51") diameter button,
25% compression, sample preconditioned at aging
temperature before compression, measurements made
at aging temperature as per method ISO 3384(A);
discontinuous Wallace stress relaxometer
Table 4--typical compression stress
relaxation data * at 100[degrees]C
100 (Ft/Fo) = A-B [Log (t/to)]
Residual
force after
1,000 hrs.,
Santoprene TPV A B percent
General purpose grades
101-55 (600 hrs.) 100.5 9.8 68 (est.)
101-73 (3,000 hrs.) 101.7 9.7 70
101-80 (2,000 hrs.) 99.0 9.5 68
* 6.2 mm (0.24") thick/13 mm (0.51") diameter button,
25% compression, sample preconditioned at 100[degrees]C
(212[degrees]F) before compression, measurements made at
100[degrees]C, method ISO 3384(A); discontinuous Wallace
stress relaxometer
Table 5--typical compression stress-relaxation data *
Santoprene TPV vs. E thermoset rubbers, method ISO 3384(A)
100 (Ft/Fo) = A-B [Log (t/to)]
Force retention (%) after 2500 hrs
23[degrees]C 70[degrees]C
Compound (73[degrees]F) (158[degrees]F)
Sulfur vulcanized EPDM #1 58 63
60 durometer A (a)
Sulfur vulcanized EPDM #2 81 -
60 durometer A (b) 82 73
Sulfur vulcanized EPDM #3
70 durometer A (b)
Sulfur vulcanized SBR (a) 83 66
Nitrile rubbery (c) 78 67
Santoprene TPV 70 -
121-58W175
Santoprene TPV 68 74
101-64
Santoprene TPV 69 -
121-73W175
Force retention (%) after 2500 hrs
80[degrees]C 100[degrees]C
Compound (176[degrees]F) (212[degrees]F)
Sulfur vulcanized EPDM #1 - -
60 durometer A (a)
Sulfur vulcanized EPDM #2 69 58
60 durometer A (b) 63 45
Sulfur vulcanized EPDM #3
70 durometer A (b)
Sulfur vulcanized SBR (a) - -
Nitrile rubbery (c) - 30
Santoprene TPV 72 -
121-58W175
Santoprene TPV - -
101-64
Santoprene TPV 76 65
121-73W175
(a)-Compounded for pipe seals
(b)-Compounded for weatherseals (table 7)
(c)-Compounded for automotive clean air ducts
Table 6--typical compression stress data, aged at 70[degrees]C
against method ISO 3384(B) 100 * (Ft/Fo) = 56.7 - 5.9 * log (t/to)
Residence Residence Log (t/to) *
time @ time @ @ 70[degrees]C
23[degrees]C 70[degrees]C (158[degrees]F)
(73[degrees]F)
0.5
2.5 0.69
19 1.58
89 2.25
254 2.70
420 2.92
585 3.07
1,254 3.40
1,984 3.60
2,990 3.77
4,523 3.95
Force
Force retention,
(N) %
170 100
89 52
80 47
73 43
70 41
70 41
69 41
59 35
57 34
58 34
58 34
* to = reference time, e.g., 30 minutes
at 70[degrees]C (158[degrees]F)
Table 7--EPDM formulated for weather seal
Recipe phr
EPDM rubber--60 hardness A
Vistalon 3666 (43% par. oil) 92
Vistalon 8510 (13% par. oil) 57
APF N-683 carbon black 85
Sillitin Z 50
Flexon 876 45
PEG 3350 3
Stearic acid 1
Zinc oxide 5
Calcium oxide 8
Sulfur 1
MBT 0.5
MBTS 0.5
ZBEC 0.7
ZDBP 1
Geniplex--80 0.7
TBzTD 0.5
Vulkalent E C 0.3
Total phr 349.2
Specific gravity 1.2
EPDM rubber--70 hardness A
Vistalon 7500 100
FEF N-550 carbon black 110
GPF N-660 carbon black 60
Omya BL 30
Flexon 876 oil 85
PEG 3350 3
Aflux 42 3
Stearic acid 1.5
Zinc oxide 5
Calcium oxide 7
Sulfur 1
MBT 1.5
TMTD 0.8
DPTTS 1
ZDEDC 0.8
Total phr 409.6
Specific gravity 1.23
COPYRIGHT 2008 Lippincott & Peto, Inc.
COPYRIGHT 2008 Gale, Cengage Learning
Content provided in partnership with
Most Recent Business Articles
- Freudenberg IT Invests $38 Million for Growth
- Research and Markets: Israel Ophthalmic Devices Investment Opportunities, Analysis and Future Forecasts Through to 2015
- Research and Markets: Emerging APAC (China) Networking Opportunity 2009 - Addressing a Growing Demand in a Downturn Economy
- Research and Markets: Indian Small & Medium Businesses SaaS Channel Partners 2009 - A Growing Opportunity in a Challenging Business Environment
- Research and Markets: Nippon Oil Corporation LNG Export and Import Markets, 2000 to 2015 Report - Profile and Analysis and Forecasts of Terminal Wise Capacity and Associated Contracts
Most Recent Business Publications
Most Popular Business Articles
- 7 tips for effective listening: productive listening does not occur naturally. It requires hard work and practice - Back To Basics - effective listening is a crucial skill for internal auditors
- Using object-oriented analysis and design over traditional structured analysis and design
- FAS 109: a primer for non-accountants - Financial Accounting Standards Board's "Statement 109: Accounting for Income Taxes"
- LIFO vs. FIFO: a return to the basics
- Design a commission plan that drives sales - Sales Commissions
