Borneol O-Ring Compatibility: Which Compounds Hold Up
Borneol O-Ring guide for fragrance and specialty organics service: chart ratings, why FKM is the preferred start, and which elastomers to avoid with this terpene alcohol.
Borneol is a bicyclic terpene alcohol used in fragrances, camphor-related chemistry, and specialty organics. Seals on transfer valves, pump flanges, sample ports, reactor nozzles, and drum or tote fittings see a solid or solvent-dissolved terpene alcohol that challenges polar-service stocks and some everyday general-purpose elastomers. Pick poorly and you get swell, softening, and early weep.
This guide maps the handbook Chemical Compatibility Chart row for Borneol to practical compound choices.
Where it shows up
- Fragrance and flavor compounding: borneol and camphor-family intermediates in perfume, cosmetic, and specialty aroma streams
- Camphor-related chemistry: synthesis, recovery, and transfer of related bicyclic terpene alcohols
- Specialty organics manufacturing: reactors, condensers, and solvent loops that handle neat or dissolved borneol
- Sample and lab process connections: valves and fittings on analytical or pilot lines
- Drum, tote, and small-package transfer: fill heads and pump skids moving solutions or melts that include borneol
Service is usually neat solid contact after melt, or borneol in organic solvent, in glass-lined, stainless, or specialty equipment near ambient to moderately warm. Chart ratings assume a generic commercial compound near room temperature. Concentration, heat, and co-solvents change outcomes.
How borneol stresses an O-Ring
Terpene alcohols sit between hydrocarbon solvents and more polar oxygenates. They can dissolve into elastomer networks that are built for water, steam, or polar aqueous duty and drive swell, modulus loss, and extrusion risk. On this chart row, fluorocarbons (FKM and FFKM) and PTFE are the strong answers. Nitrile, HNBR, and fluorosilicone rate good (2) for many static uses when grade and temperature fit. EPDM, neoprene, and butyl are not recommended (4). Heat and continuous immersion accelerate damage even when a short splash test looked acceptable. See Chemical Compatibility and Failure Analysis.
Handbook chart ratings for borneol
Same rating badges and layout as the interactive chart. Search Borneol on the Chemical Compatibility Chart to pin the live row.
| Fluid | Best | N Nitrile | H HNBR | E EPDM | C Neoprene | S Silicone | V Viton® | P Urethane | F FVMQ | A Aflas® | B Butyl | K FFKM | T PTFE |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Borneol | V | 2 | 2 | 4 | 4 | X | 1 | 3 | 2 | X | 4 | 1 | 1 |
Best family on the chart row: Viton® / FKM (V). FFKM and PTFE also rate excellent (1). Nitrile, HNBR, and fluorosilicone rate good (2). Polyurethane rates poor (3). Silicone and Aflas® lack data (X). EPDM, neoprene, and butyl are not recommended (4).
Recommended O-Ring materials
First choice: Viton® / FKM
FKM (Viton®) is rated excellent (1) and is the chart’s preferred letter for borneol. It is the everyday fluorocarbon start for fragrance and specialty organics transfer seals when temperature and pressure stay inside commercial FKM windows. Use 70 Shore A for most static flanges; step hardness or add a back-up ring when pressure and clearance gap climb.
Also usually serviceable
Materials to use with caution or avoid
Physical properties to match (after chemistry)
A chart 1 means the polymer family usually survives the fluid. Finish the spec with the gland and process needs:
- Hardness: 70 Shore A for most static covers and flanges; 90 Shore A or a back-up ring when pressure and gap climb (Shore A Hardness).
- Temperature: handbook chemical ratings are near room temperature. Warm melts, solvent loops, and heat-traced lines age seals faster. Confirm continuous temperature against the Temperature Guide.
- Static vs dynamic: face and cover seals are mostly static; shafts and rods need abrasion and extrusion control beyond a chemical letter (groove design).
- Size: lock ID × CS (or the AS568 dash) on the Master O-Ring Size Chart before arguing compound.
Practical selection checklist
- Confirm neat borneol vs solvent solution and any co-solvents on the SDS.
- Note temperature and whether the seal sees melt, solution, vapor, or solids handling.
- Start with FKM at 70 Shore A for general static duty unless a plant standard already calls for FFKM or PTFE-encapsulated.
- Treat nitrile, HNBR, and fluorosilicone as secondary good (2) options for milder ambient static duty after grade confirmation.
- Avoid EPDM, neoprene, and butyl for continuous borneol contact on this chart row. Treat polyurethane as poor (3) and silicone / Aflas® as no data until tested.
- Pin Borneol on the Chemical Compatibility Chart. For critical service, contact The O-Ring Store with fluid grade, temperature, hardness, and duty cycle.
Quick answers
Which O-Ring for borneol?
Start with FKM (Viton®) at 70 Shore A for general static duty. FFKM and PTFE also
rate excellent. Nitrile, HNBR, and fluorosilicone are usually good for milder static
service. Avoid EPDM, neoprene, and butyl for continuous contact on this chart row.
Is borneol the same as camphor or other terpenes on the chart?
Related camphor-family and terpene rows may appear nearby. Always match the exact fluid
name on the chart and on the SDS.
Chart ratings are guidance for generic commercial compounds near room temperature. Concentration, temperature, and co-fluids change outcomes. Evaluate specific parts before use in critical applications.
