Left: initialRight: final
Kammprofile
0MPa
No residual contact stress modeled
High recovery gasket / Series 907
TEADIT®907HRG™
A better design.
A better seal.
Higher recovery.
Designed for the lifecycle of the connection, not just the initial seal.
Your joint heats and cools under varying operating conditions.
TEADIT® 907 HRG is engineered to recover as flange loads vary, helping maintain consistent sealing contact.
Ideal For heat exchanger manufacturers and plant teams evaluating demanding gasketed joints.
Design for the operating cycleRecovery helps maintain contactSealing for a safer and greener tomorrowNew equipment and existing jointsDesign for the operating cycleRecovery helps maintain contactSealing for a safer and greener tomorrowNew equipment and existing joints
01 The problem
Thermal cycling changes the joint load. The gasket has to adapt.
Heat exchangers and other cycling equipment do not remain static. Temperature changes can create expansion, contraction, and flange movement, reducing gasket stress and increasing the risk of leakage.
Model / Section through flanged joint / movement exaggerated
Cold metalHot metal
- 01
Heat-up
Start-up or a process swing heats the shell and flanges.
- 02
Hot and expanded
Parts can grow at different rates, shifting the faces around the gasket.
- 03
Cool-down
Cooling can change the joint geometry and flange loads again.
- 04
Cold and contracted
The cycle repeats. Sealing has to hold through every pass
02 TEADIT® 907 HRG
TEADIT® 907 HRG, maintains sealing performance as joint conditions vary.
TEADIT® 907 HRG is a high-recovery gasket with a wave-profile metallic core. Under bolt load, the core deflects and stores elastic energy. As load decreases, that stored energy allows the gasket to recover, helping maintain sealing contact.
See how recovery works
Product front view
Product detail
Inside the wave-profile core.
See the metallic construction in the product photograph and section drawing.
03 How recovery works
From compression to recovery.
Follow the gasket through two stages to understand how the TEADIT® 907 HRG high recovery gasket technology helps it respond to flange movement.
Explore the recovery and cycling process, including the test conditions and limitations. The illustration explains the mechanism; it is not a measured performance result or a guarantee of field service life.
Review the research and test conditions907 HRG / wave-core sectionDetail A—A · schematic
Elastic recovery of the wave-profile coreContinuous solid core with flat crests, flat troughs and straight sloping sides, based on the supplied trapezoidal profile. Deflection is exaggerated. This is not a dimensional drawing, deformation analysis, or measured performance result.
Phase 01 — Compressed stage
Compressed stage
Bolt load deflects the metallic wave-profile core between the flange faces, storing elastic energy.
Both faces in contact
- Bolt load
- Applied
- Upper flange face
- Initial position
- Gasket elasticity
- Storing energy
- Upper contact
- Closed
Qualitative states, not measured values.
04 Application fit
Is recovery a priority in your equipment?
Consider the TEADIT® 907 HRG when varying joint load makes gasket recovery an important part of the sealing solution decision.
New equipment
Heat exchanger manufacturers
Assess 907 HRG during new-equipment specification, alongside the joint design and intended operating cycle.
Installed equipment
Plant teams
Review 907 HRG for installed equipment where cycling, flange movement, or current gasket performance warrants further assessment.
Suitability depends on the joint geometry, service conditions, materials, and assembly. Application relevance does not establish drop-in compatibility; 907 HRG is not a universal drop-in replacement.
05 Configuration choices
Select the configuration for your connection.
Start with the 907 HRG sealing ring, then assess whether the joint requires a centering ring, an inner ring, or both. Ribs are available as required.
Size range: NPS 1/2 through 200+ inches.
Selected assembly
1 component
CONFIGURATION 01
Ring
Real sealing-ring photograph with illustrated accessories. Centering and inner rings are illustrative—not photographed variants or manufacturing geometry. Confirm materials, dimensions and fit with TEADIT.
Included in this assembly
- Sealing ring
Choose a configuration
The sealing ring without optional centering or inner rings.
View selected assemblySealing ring
Included, photographedThe metallic wave-profile ring, stamped TEADIT. It is the part you see in the photograph, and it is in every choice.
Centering ring
Not includedSits outside the sealing ring and locates it in the joint. It can be loose-fit or integral.
Inner ring
Not includedSits inside the sealing ring, on the bore side.
Centering rings can be loose-fit or integral. Confirm the required dimensions and configuration for your application.
Ribs are not depicted. Available upon request.
06Why talk to TEADIT?
Bring your application to TEADIT.
Whether you are specifying a new heat exchanger or reviewing an installed joint, discuss the application—not just the gasket size.
Application discussion
Heat exchanger manufacturers and plant teams: discuss whether 907 HRG fits your joint and operating cycle.
Discuss your applicationEquipment
Tell us what you are sealing, the joint arrangement, and whether the requirement is for new or existing equipment.
Cycle
Describe operating temperatures, pressure, startup and shutdown frequency, and any known flange movement.
Fit
Share the gasket dimensions, required configuration, current gasket, and sealing issues. Discuss with TEADIT whether 907 HRG is appropriate for the application.
Supporting detail: recovery constructionCross-sections compared: heavy spiral winding versus wave-profile solid cores.
How recovery helps Recovery primer
Designed to store energy.Built to recover.
Thermal cycles, pressure swings and bolt relaxation can reduce compressive load on a gasket. A recovery gasket deflects under assembly stress and stores elastic energy. As flange load changes, that stored energy helps maintain the contact stress needed for sealing.
Competitor: F Heavy spiral winding
Recovery comes from a heavily wound spiral element that stores deflection in the winding itself.
Competitor: L Modified solid wave-profile core
A solid metal core machined with a wave profile, so the core itself flexes and returns.
TEADIT® 907 HRG Modified solid wave-profile core
A solid core with a tuned wave profile, designed to retain sealing stress as load is lost.
Two concepts shown: spiral winding versus wave-profile solid core.
Supporting evidence: research, test traces and simulationSource paper, helium leakage tests, thermal-cycle traces (18 / 14 / 24+), contact-stress simulation and PDF resources.
Competitor comparison / EN 13555
Compare high-recovery designs
on evidence.
Look beyond the recovery label. This comparison asks how much gasket stress each tested design needs to reach the same helium leakage target—not how long it lasts in service.
Identify the tested specimens and source mapping
Connecting the paper and supplied slides
Fig. 7 / Style 1
Competitor F
Fig. 8 / Style 2
TEADIT® 907 HRG
Fig. 9 / Style 3
Competitor L
Named-product mapping comes from the supplied TEADIT slides; the ASME paper itself labels Recovery Styles 1 to 3. Exact values come from the paper.
Leakage test / Separate from the thermal-cycle test
Lower required stress at tighter leak targets.
Ambient helium, 40 bar / paper-verified
At a leak target of 1E-4 mg/(m·s), 907 HRG needed 24.2 MPa of gasket stress, compared with 35.0 MPa for Competitor F and 54.3 MPa for Competitor L. Lower values mean less gasket stress was needed to reach the same leak target.
Competitor F
35.0MPa
Required gasket stress
TEADIT® 907 HRG
24.2MPa
Required gasket stress
Competitor L
54.3MPa
Required gasket stress
Results depend on the leak target. At the loosest listed target, 1E-1 mg/(m·s), Competitor F required 6.5 MPa versus 6.7 MPa for 907 HRG. This is not a claim of superiority at every target.
Inspect all leak targets and the supplied traces
Average required gasket stress / MPa
Swipe the table to compare all three designs →
| Leak target mg/(m·s) | Competitor F | TEADIT® 907 HRG | Competitor L |
|---|---|---|---|
| 1E-1 | 6.5 | 6.7 | 7.0 |
| 1E-2 | 14.4 | 12.5 | 17.3 |
| 1E-3 | 23.1 | 17.3 | 30.3 |
| 1E-4 | 35.0 | 24.2 | 54.3 |
| 1E-5 | 122.0 | 36.8 | 77.1 |
| 1E-6 | not achieved | 70.1 | not achieved |
| 1E-7 | not achieved | 90.5 | not achieved |
- Lowest stress in row, MPa
- — Target not achieved within the reported test conditions.
- 1E-4: 24.2 vs 35.0 and 54.3 MPa
Results depend on the leak target. At the loosest listed target, 1E-1 mg/(m·s), Competitor F required 6.5 MPa versus 6.7 MPa for 907 HRG.
Source: ASME PVP2026-180001, Table 1, p. 5, average of two Qmin tests. Product names from TEADIT slides (Figs. 7-9).
Read the paper
Performance Evaluation of Recovery-Type Gaskets Under Thermal Cycling Conditions
Girão, Roca, Meira and Norman. Proceedings of ASME PVP2026, PVP2026-180001.
Specimen mapping (Style 1: Competitor F; Style 2: TEADIT® 907 HRG; Style 3: Competitor L) comes from the supplied TEADIT slides; it is not stated in the ASME paper, which provides the exact values. Laboratory results do not guarantee field lifetime.
The conversion question Conventional gasket baselines
Using spiral wound
or Kammprofile?
Review high recovery.
Choosing between high-recovery brands is one decision. Moving from a conventional gasket is another. This thermal-cycle test compares TEADIT® 907 HRG with spiral wound and Kammprofile specimens under the same conditions.
907 HRG maintained sealing through the full 24-cycle sequence. The result supports evaluating recovery for suitable cyclic-service joints—not replacing every conventional gasket.
Spiral wound gasket18cycles
Kammprofile gasket14cycles
TEADIT® 907 HRG24+cycles
24+ means no observed failure through the 24 tested cycles—not a measured service-life limit.
Inspect test conditions
- Initial gasket stress
- 5,000 psi
- Temperature cycle
- Ambient to 320°C (608°F)
- Initial pressure
- 33 bar (479 psi), closed system
- Failure criterion
- Below 32 bar (464 psi)
Combined pressure traces compare TEADIT® 907 HRG with the conventional baselines. The individual plots below show these three gasket designs.
Explore the three individual test traces
Modeled evidence Residual contact stress
After the flanges move, how much stress is left?
Finite element simulation: each gasket is loaded to 100 MPa (14,500 psi), then the model applies a prescribed flange movement. The figures below are residual contact stress from that model.
Simulation, not a leak test. Residual contact stress is a modeled indicator. It is not a measured leak rate and not a performance guarantee. Contour colors show stress, never leakage.
Left: initialRight: final
Sinusoidal profile
33.0MPa
4,786 psi residual
Left: initialRight: final
TEADIT Style 907
40.2MPa
5,831 psi residual
Test background / ASME PVP2026-180001
What thermal cycling does to a joint.
In plain language
Hot and cold flanges do not move together.
Heating and cooling make flanges and bolts expand and contract by different amounts, while the bolts and gasket can relax. Clamping stress on the gasket can fall, which can open a leak path. This is especially important during heat-exchanger start-up and shutdown.
Source: paper p. 1
Thermal-cycle test protocol
24 cycles, pressure tracked
- Flange
- 4-in Class 300, raised face
- Initial gasket stress
- 5,000 psi
- Temperature
- Room temperature to 320°C
- Cycles
- 24
- Pressure
- 33 bar at hot setpoint, applied once; no re-pressurization between cycles
- Measurement
- 1-hour hot pressure decay each cycle
- Failure
- Decay greater than 1 bar in an evaluation
Source: paper p. 3, section 2.3
Application support: new equipment and existing jointsReview paths for manufacturers and plant teams, plus selection and qualification guidance.
From evidence to application
New equipment.
Existing joints.
A supported decision.
Whether you are specifying a heat exchanger or reviewing a gasket replacement, the next step is the same: establish whether 907 HRG fits the application. Choose the conversation that matches your work.
Heat exchanger manufacturers
Specify for new equipment.
Evaluate TEADIT® 907 HRG for suitable gasketed flange connections during equipment design—not only after a sealing problem occurs.
- Identify the connections and gasket geometry.
- Review operating pressure, temperature and cycling.
- Define material, assembly and qualification requirements.
Discuss an OEM application
Opens an email draft with an application checklist for the TEADIT team.
Plant, maintenance & reliability teams
Review an existing application.
Using spiral wound or Kammprofile gaskets? Start with joints exposed to thermal cycling, changing flange loads or recurring sealing concerns.
- Document the current gasket and service history.
- Check flange geometry, materials and operating conditions.
- Review fit, assembly requirements and a suitable trial.
Evaluate a gasket conversion
Opens an email draft with an application checklist for the TEADIT team.
Application review comes first. 907 HRG is not a universal drop-in replacement or a fit for every heat exchanger design. Suitability depends on the joint, service conditions, materials and assembly.
Engineering support Selection and qualification
From gasket selection
to sound assembly.
Specifying a new heat exchanger and converting an installed joint are different decisions. Both need an application review to establish suitability, fit and qualification requirements.
- 01
Review the service
Establish the fluid, pressure, temperature and operating cycle—not just the nominal conditions.
- 02
Check the joint
Confirm gasket fit, flange geometry and condition, material compatibility and available bolt load.
- 03
Plan qualification
For new equipment, define validation requirements. For installed joints, review a suitable trial before broader conversion.
- 04
Prepare assembly
Review installation and bolting procedures. Recovery is not a substitute for correct joint assembly.
Sound assembly still decides the outcome.
Correct bolting, flange condition and application-specific selection matter as much as gasket construction. Talk to an engineer about your joint.
FAQ Before you specify
Frequently asked questions.
A practical starting point for understanding 907 HRG and discussing your application.
Have a question about your specific joint?
Talk to TEADIT907 HRG is a high-recovery metallic gasket with a continuous solid wave-profile core. Its elastic recovery helps accommodate changes in flange-face separation and maintain sealing contact as joint load changes.
See how recovery works07 Contact TEADIT
Discuss suitability. Define the specification. Request a quote.
Need to assess the application? Contact TEADIT with your equipment details, operating cycle, gasket size and configuration, and current sealing challenge.
Sales email: sales@teadit.com
The email button opens a draft in your email app. Nothing is sent until you send it.
Prefer a browser? Use our online contact form (opens in a new tab)TEADIT® iQuote™
Ready to prepare a quotation request?
Use TEADIT iQuote™ to configure gasket requirements and support the quotation process for standard and custom sealing solutions.
About Teadit
About us
Sealing for a safer and greener tomorrow
Since 1958, Teadit has been helping industry solve critical sealing challenges around the world.
With manufacturing operations around the globe, we combine technical expertise, reliable products, responsive support, and a customer-focused approach that makes us easy to do business with.
North America
Pasadena - TX
110,000
Sq ft facility
Manufacturing, warehousing and U.S. distribution.
Service & support
Around the clock
24/7
Support
Manufacturing, engineering and on site support.