X-Energized Seals

100% reliable drop-in replacement for C-seals or spring-energized seals

Drop-In Replacement — Low Cost — High Assembly Yields

Why Bostec X-Energized Are Better:

Bostec X-Energized seals are a drop-in replacement for C-seals, boasting 100% guaranteed reliability, reduced closure force, and cost-effectiveness. When you make the switch to X-Energized, you’ll experience an immediate leap to 100% UHV, every connection will seal first time, every time. Moreover, you’ll benefit from a reduced force requirement to achieve true UHV at 1 x 10-10 torr. Production efficiency will increase and costs will fall.

Available in nickel, copper, and aluminum, Bostec X-Energized seals come in both off-the shelf and customizable sizes, with a production lead time of 4 to 6 weeks.

Key advantages of X-Energized seals include:

  • 100% reliability: They seal flawlessly every time
  • Lower force requirement
  • 10x tolerance flexibility

Why C-Seal are a problem:

C-seals were developed in the late 1960s for use in harsh environments. The principle of sealing is to prevent leakage by removing gaps between the surfaces. The original concept with C-seals was a spring-back design that would, in theory, provide elastic resistance.

Unfortunately, long term use of C-seals uncovered many reliability problems and C-seals have earned a reputation of being fussy to use. If you have any of the following problems, consider Bostec X-Energized seals.

Reliability Concerns: In OEM applications, C-Seals have shown poor reliability during initial installation, often requiring multiple attempts, and occasional heating of flanges to achieve a leak-tight seal. Bostec has many commercial OEM customers who report first installation failures of 40% to 50% with C-seals.

Surface Finish Challenge: Producing the required surface finish for C-Seals, especially for sizes above 100mm (4″ diameter), is difficult to achieve. Sizes beyond 200mm (8”OD) are beyond most practical machining capabilities.

Low Bake-Out Temperature: C-Seals’ bakeout temperature limit of 100°C is insufficient for most applications, where normal bakeout requirements range from 250°C to 350°C.

Costly: Gland manufacturing for C-seals is slow and costly and C-Seal procurement is often difficult with lead times of 6 months or longer, which makes them economically impractical.

Exclusion from New Projects: Due to these challenges, many organizations no longer use C-Seals for new projects, opting for more dependable and cost-effective alternatives.

Bostec X-Energized seals are a direct, drop-in replacement that are 100% reliable (guaranteed), require less closure force and are generally less costly than C-seals. Available in nickel, copper and aluminum, Bostec X-Energized seals are either off-the shelf or custom sizes can be produces in 4 to 6 weeks.

Bostec X-Energized Size Chart

OD ±.001 inches
Nickel - 10pcs
Nickel - 100pcs
Nickel - 200pcs
Aluminum - 10pcs
Aluminum - 100pcs
Aluminum - 200pcs
OFS Copper - 10pcs
OFS Copper - 100pcs
OFS Copper - 200pcs
0.314
$125.76
$115.70
$106.44
$124.49
$114.53
$105.37
$124.85
$114.86
$105.67
0.345
$126.24
$116.14
$106.85
$124.83
$114.85
$105.66
$125.23
$115.21
$105.99
0.377
$126.74
$116.60
$107.27
$125.18
$115.17
$105.95
$125.62
$115.57
$106.32
0.408
$114.18
$105.05
$96.64
$112.46
$103.47
$95.19
$112.95
$103.91
$95.60
0.471
$115.20
$105.98
$97.50
$113.14
$104.09
$95.77
$113.72
$104.62
$96.25
0.534
$90.15
$82.94
$76.30
$87.73
$80.71
$74.25
$88.41
$81.34
$74.83
0.591
$91.15
$83.86
$77.15
$88.36
$81.29
$74.79
$89.14
$82.01
$75.45
0.654
$92.28
$84.90
$78.10
$89.06
$81.94
$75.38
$89.97
$82.77
$76.15
0.717
$93.43
$85.95
$79.08
$89.76
$82.58
$75.97
$90.79
$83.53
$76.84
0.780
$94.63
$87.06
$80.09
$90.47
$83.23
$76.57
$91.64
$84.31
$77.56
0.842
$95.84
$88.17
$81.12
$91.17
$83.88
$77.17
$92.48
$85.08
$78.28
0.906
$97.11
$89.34
$82.19
$91.89
$84.54
$77.77
$93.35
$85.89
$79.02
0.968
$98.39
$90.52
$83.28
$92.60
$85.19
$78.37
$94.22
$86.69
$79.75
1.026
$99.62
$91.65
$84.32
$93.26
$85.80
$78.94
$95.05
$87.45
$80.45
1.089
$100.97
$92.89
$85.46
$93.98
$86.46
$79.54
$95.94
$88.27
$81.21
1.152
$102.37
$94.18
$86.65
$94.71
$87.13
$80.16
$96.86
$89.11
$81.98
1.214
$103.79
$95.49
$87.85
$95.43
$87.80
$80.77
$97.78
$89.96
$82.76
1.278
$105.26
$96.84
$89.09
$96.17
$88.48
$81.40
$98.72
$90.83
$83.56
1.340
$106.74
$98.20
$90.35
$96.90
$89.15
$82.02
$99.66
$91.69
$84.36
1.403
$108.28
$99.62
$91.65
$97.65
$89.83
$82.65
$100.63
$92.58
$85.18
1.466
$109.83
$101.04
$92.96
$98.38
$90.51
$83.27
$101.60
$93.47
$85.99
1.529
$111.44
$102.52
$94.32
$99.14
$91.21
$83.91
$102.59
$94.38
$86.83
1.654
$114.73
$105.55
$97.11
$100.64
$92.59
$85.18
$104.60
$96.23
$88.53
1.780
$118.16
$108.71
$100.01
$102.16
$93.99
$86.47
$106.65
$98.12
$90.27
1.906
$121.73
$111.99
$103.03
$103.69
$95.40
$87.77
$108.76
$100.06
$92.05
2.031
$125.43
$115.39
$106.16
$105.24
$96.82
$89.08
$110.91
$102.04
$93.87
2.157
$129.26
$118.92
$109.41
$106.80
$98.26
$90.40
$113.11
$104.06
$95.74
2.283
$133.23
$122.58
$112.77
$108.38
$99.71
$91.73
$115.36
$106.13
$97.64
2.408
$140.34
$129.11
$118.78
$112.97
$103.93
$95.62
$120.66
$111.01
$102.12
2.534
$144.58
$133.02
$122.38
$114.57
$105.41
$96.98
$123.00
$113.16
$104.11
2.659
$148.96
$137.05
$126.08
$116.19
$106.90
$98.35
$125.40
$115.37
$106.14
2.785
$153.48
$141.20
$129.90
$117.83
$108.40
$99.73
$127.84
$117.61
$108.21
2.911
$158.13
$145.48
$133.84
$119.48
$109.92
$101.12
$130.33
$119.91
$110.31
3.036
$162.92
$149.88
$137.89
$121.14
$111.45
$102.53
$132.87
$122.24
$112.46
3.162
$167.84
$154.41
$142.06
$122.82
$112.99
$103.95
$135.46
$124.63
$114.66
3.228
$236.93
$217.98
$200.54
$164.69
$151.51
$139.39
$174.59
$160.62
$147.77
3.479
$251.65
$231.52
$213.00
$168.56
$155.07
$142.67
$179.95
$165.55
$152.31
3.730
$267.22
$245.84
$226.18
$172.52
$158.72
$146.02
$185.50
$170.66
$157.01
3.982
$283.64
$260.95
$240.07
$176.57
$162.44
$149.45
$191.25
$175.95
$161.87
4.233
$303.40
$279.13
$256.80
$183.21
$168.55
$155.07
$199.69
$183.71
$169.01
4.484
$356.52
$327.99
$301.75
$222.44
$204.64
$188.27
$240.82
$221.55
$203.83
4.735
$375.48
$345.44
$317.80
$226.76
$208.62
$191.93
$247.15
$227.38
$209.19
4.987
$395.29
$363.66
$334.57
$231.17
$212.68
$195.66
$253.67
$233.38
$214.71
5.238
$415.94
$382.67
$352.06
$235.67
$216.82
$199.47
$260.38
$239.55
$220.39
5.489
$439.45
$404.29
$371.95
$242.26
$222.88
$205.05
$269.29
$247.75
$227.93
5.740
$461.81
$424.86
$390.87
$246.94
$227.19
$209.01
$276.40
$254.29
$233.94
5.992
$485.01
$446.21
$410.51
$251.71
$231.58
$213.05
$283.69
$261.00
$240.12
6.243
$537.06
$494.10
$454.57
$284.58
$261.81
$240.86
$319.19
$293.65
$270.16
6.494
$561.96
$517.00
$475.64
$289.53
$266.36
$245.05
$326.87
$300.72
$276.66
6.745
$587.71
$540.69
$497.44
$294.57
$271.00
$249.32
$334.75
$307.97
$283.33
6.997
$614.31
$565.16
$519.95
$299.70
$275.72
$253.66
$342.82
$315.40
$290.17
7.248
$683.75
$629.05
$578.73
$346.92
$319.16
$293.63
$393.09
$361.64
$332.71
7.499
$712.05
$655.08
$602.68
$352.23
$324.05
$298.13
$401.55
$369.43
$339.87
7.750
$741.19
$681.89
$627.34
$357.63
$329.02
$302.70
$410.21
$377.39
$347.20
8.002
$771.18
$709.49
$652.73
$363.12
$334.07
$307.34
$419.06
$385.53
$354.69
8.253
$802.02
$737.86
$678.83
$368.70
$339.20
$312.07
$428.10
$393.85
$362.34
8.504
$833.71
$767.01
$705.65
$374.37
$344.42
$316.87
$437.33
$402.35
$370.16
8.755
$936.24
$861.34
$792.44
$450.13
$414.12
$380.99
$516.77
$475.42
$437.39
9.007
$969.63
$892.06
$820.69
$455.98
$419.50
$385.94
$526.39
$484.28
$445.54
9.258
$1,003.86
$923.55
$849.67
$461.92
$424.97
$390.97
$536.21
$493.31
$453.85
9.509
$1,038.94
$955.83
$879.36
$467.95
$430.51
$396.07
$546.22
$502.52
$462.32
9.760
$1,074.87
$988.88
$909.77
$474.07
$436.14
$401.25
$556.43
$511.91
$470.96
10.012
$1,111.65
$1,022.72
$940.90
$480.28
$441.86
$406.51
$566.83
$521.48
$479.76

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