ABOUT THIS PART
Platinum cured silicone tri clamp gasket, FDA compliant, in 1, 1.5, 2, 4 and 6 inch, from $1.95. Every size is priced on this page.
SPECIFICATIONS
| Material | Platinum cured silicone |
|---|---|
| Compliance | FDA compliant |
| Connection | Tri-clamp sanitary |
| Sizes | 1 in, 1.5 in, 2 in, 4 in, 6 in |
| Prices | 1 in $1.95, 1.5 in $1.95, 2 in $1.95, 4 in $3.75, 6 in $32.50 |
| Temperature range | -85 F to 450 F (-65 C to 232 C), the widest span of any elastomer in this range |
| Solvent compatibility | Severe on butane, propane, heptane, pentane, hexane and isopropyl. Good on ethanol with minor effect |
| Not for | Hydrocarbon extraction service |
| Certification note | 3P Certz ECR-200031-R0 states silicone is not an acceptable seal or gasket material for the extraction system |
| Use instead | Viton for solvent, PTFE for isopropyl or cold service |
| Best for | Steam, hot water and food contact |
| Clamp torque | 30 in-lb, elastomeric gasket |
| Service interval | Every 3 to 6 months |
| Built or stocked | Stocked in Bend, usually ships the same day |
Read this before you order. Silicone rates severe against butane, propane, heptane, pentane, hexane and isopropyl. It is not a hydrocarbon gasket and N.B. Oler does not recommend it for extraction service. It is on this site because silicone is the right answer for steam, hot water and food contact, and because people ask for it by name.
If you are running solvent, use Viton. If you are running isopropyl or going cold, use PTFE.
Sizes and price
| Size | Price |
|---|---|
| 1 in | $1.95 |
| 1.5 in | $1.95 |
| 2 in | $1.95 |
| 4 in | $3.75 |
| 6 in | $32.50 |
The numbers
- Temperature: -85 F to 450 F (-65 C to 232 C), the widest low-to-high span of any elastomer in this range
- Clamp torque: 30 in-lb, the elastomeric figure. PTFE takes 50
- Compliance: platinum cured, FDA compliant
- Good on ethanol, with minor effect
- Severe on butane, propane, heptane, pentane, hexane and isopropyl
N.B. Oler's certification reports are explicit on this point. 3P Certz ECR-200031-R0 states that component seals and gaskets may be PTFE, PEEK, FKM, Buna-N or Viton, and that EPDM, PVC and silicone are not acceptable materials for use in the extraction system. Silicone belongs on a steam or food line, not on a solvent line.
Solvent compatibility, by material
| Material | Butane | Propane | Ethanol | Heptane | Pentane | Hexane | Isopropyl |
|---|---|---|---|---|---|---|---|
| Silicone | D | D | B | D | D | D | D |
| PTFE | A | A | A | A | A | A | A |
| Viton (FKM) | A | A | A | A | A | A | D |
| Buna-N | A | A | C | A | E | A | D |
A excellent, B good with minor effect, C fair and not for continuous use, D severe and not recommended, E no data. From the N.B. Oler Sintered Filter Technical Specifications, Rev. 2026.1.
Which material for which job
| Material | Temperature | Torque | Pick it when |
|---|---|---|---|
| Silicone | -85 F to 450 F (-65 C to 232 C) | 30 in-lb | Steam, hot water and food contact. Severe on every hydrocarbon |
| Viton (FKM) | -40 F to 400 F (-40 C to 204 C) | 30 in-lb | The hydrocarbon default. Not for isopropyl |
| Solid PTFE | -350 F to 500 F (-212 C to 260 C) | 50 in-lb | Isopropyl, or cold service. Cheapest route to full chemical resistance |
| PTFE envelope, Viton core | -100 F to 400 F (-73 C to 204 C) | 50 in-lb | PTFE chemistry with spring-back, for joints broken every run |
| Buna-N | -30 F to 250 F (-34 C to 121 C) | 30 in-lb | Water, food, general sanitary. Cheapest |
Replacement
- Replace every 3 to 6 months regardless of how it looks
- Replace immediately on any cracking, tearing, splitting or permanent deformation
- A gasket that has taken a compression set passes a cold leak check and then weeps once the line comes up to pressure. That is why interval beats inspection on a gasket
- Full comparison: Choosing the right gasket material for tri-clamp connections
Stocked in Bend, Oregon.
| STOCKED, NOT BUILT | Stocked by N.B. Oler and built by its manufacturer. |
|---|---|
| FITS | Steam, hot water and food contact lines, in 1, 1.5, 2, 4 and 6 inch tri-clamp. Does NOT fit hydrocarbon extraction service: silicone rates severe against butane, propane, heptane, pentane, hexane and isopropyl, and 3P Certz ECR-200031-R0 names it an unacceptable material for the extraction system. For a solvent line use Viton. For isopropyl or for cold service use PTFE. Torque to 30 in-lb. |
▦ IN YOUR MANUAL
This part appears in the operator manual that ships with your system. The QR code there links to this page.
◈ REFERENCE FOR THIS PART
COMMON QUESTIONS
Can I use silicone on my extraction system?
No, and we will tell you so rather than sell you one. Silicone rates severe against butane, propane, heptane, pentane, hexane and isopropyl, and 3P Certz ECR-200031-R0 names silicone as not acceptable for seals or gaskets in the extraction system. Use Viton for solvent service and PTFE for isopropyl or cold service.
Then why do you sell it?
Because silicone is the correct material for steam, hot water and food contact, and because people ask for it by name. It is here so the right person can buy it and the wrong person can find out why they should not.
What do they cost?
1 in $1.95, 1.5 in $1.95, 2 in $1.95, 4 in $3.75 and 6 in $32.50.
Why is the 1, 1.5 and 2 inch the same price?
Because that is how the market prices them. The three small sizes take the same material and the same tooling, so there is no real cost step between them.
What is silicone actually good at?
Temperature span. -85 F to 450 F, which is -65 C to 232 C, is wider than any other elastomer on this site.
What torque?
30 in-lb, the elastomeric figure. PTFE takes 50.
How often should these be replaced?
Every 3 to 6 months regardless of appearance, and immediately on any cracking, tearing, splitting or permanent deformation.
Is it food safe?
Yes, platinum cured and FDA compliant.