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CC and CL Chemical resistance Seal

CC and CL bearing seals – the problem – solvers

Perfect for use in sea water and other harsh environments!

The combination of bearing shaft seals featuring a PTFE sealing lip and a stainless steel (grade 316) housing make this sealing solution a good option for difficult and extreme conditions. Ideal for use underwater at sea, in dirty environments, for applications with corrosive chemicals or extreme temperatures. There are two types of PTFE seal available and one of them is maintenance-free for the lifetime of the bearing unit – so grease it and forget it!

Key properties

PTFE does not age, it is UV resistant, flame retardant and not hygroscopic. The water absorption is less than 0.01%. PTFE does not melt and is therefore not suitable for injection moulding. Blow molding and vacuum forming are also not possible. In addition, PTFE from Polyfluor has the following properties:

  • Dual or triple PTFE sealing lip
  • Works under high pressure up to 40 bar
  • Suitable for unhardened shafts as well
  • The ideal choice for high speeds of up to 30 m/s
  • For wide temperature range from -79°C up to 260°C
  • Excellent chemical resistance
  • Suitable for food and pharma applications (FDA-approved)
  • Good dry running capability
  • Wear-resistant and low friction
  • FDA approved
  • Greatest resistance to fatigue
  • Flame resistant – UL94V0
  • Antistick properties
  • Low co-efficient of friction
  • UV-resistant (does not age)
  • Not hygroscopic (water absorption < 0,01%)
  • Very good dielectric insulation properties

Two types of PTFE seals

These seals are useful for problematic applications such as where temperatures are extreme or chemical resistance is needed. Extreme Bearing supplies two standard types of PTFE lip seals.

CC flushes dirt away

The CC type is the version with two lips placed on the outside to keep the elements and unwanted contaminants out of the bearing housing. When the housing is filled up with grease, the lips will release the excess grease and discharge the contamination from the sealing surface.

CL is maintenance-free

Where as CL type cannot flush away the contamination from the sealing surface because this seal is equipped with an additional third lip intended to keep the grease inside. The nature of the PTFE material makes it possible for the other two sealing lips to work effectively without lubrication. This makes the CL seal unique for bearing assemblies because it does not need to be regreased and therefore is maintenance-free.

Limited seal lift prevents penetration of dirt

Normal stresses in the grease, due to the high shear rates in the shaft area or in the seal contact area, generate a contact force on the seal lip. This is in addition to the lift generated by elastohydrodynamic lubrication. Because of the overall design of the seal, this lift effect will be limited. Therefore the PTFE lips fit more tightly and with more tension around the shaft. This makes it more difficult for dirt to get under the lip and wear a groove into the shaft.

Double protection

In grease-lubricated Extreme Bearings such as the CC seal, it is not only the small gap between the seal lip and the shaft that provides sealing against contaminants. The grease in between the sealing lips also provides a sealing action.

Examples of grease diagrams using CC and CL seals

If the contamination is only on one side of the bearing unit, a seal combination such as those shown in the diagrams can be chosen. By refilling the grease on this side, it will flow and be released from the bearing housing and the contamination along with the grease will flow away from the sealing lips.

Chemical resistance PTFE

PTFE is affected by some alkali metals (molten or in solution) and rare fluorinated compounds at high temperatures and/or pressures. Some organic and halogenated solvents are absorbed causing minor dimensional changes but these effects are physical and also reversible.

Note: The chemical resistance of each polymer is mainly determined by the chemical structure of the material and the strength of the weakest link in this specific structure.

Chart codes

R – Resistant
LR – Limited Resistance
NR – Not Recommended
ND – No Data

Waiver

Actual properties may change due to processing method, compound type, extruded dimensions and other variables. It is the user’s responsibility to evaluate and fully test the suitability of the product for their specific application.

Chemical Resistance 
20°C/68°F60°C/140°F100°C/212°F
AcetaldehydeRRR
Acetic acid (10%)RRR
Acetic acid (glac./anh.)RRR
Acetic anhydrideRRR
Aceto-acetic esterRRR
AcetoneRRR
Other ketonesRRR
AcetonitrileRRR
AcetyleneRRR
Acetyl salicylic acidRRR
Acid fumesRRR
AlcoholsRRR
Aliphatic estersRRR
Alkyl chloridesNDNDND
AlumRRR
Aluminium chlorideRRR
Aluminium sulphateRRR
Ammonia, anhydrousRRR
Ammonia, aqueousRRR
Ammonium chlorideRRR
Amyl acetateRRR
AnilineRRR
Antimony trichlorideNDNDND
Aqua regiaRRR
Aromatic solventsRRR
Ascorbic acidRRR
BeerRRR
BenzaldehydeRRR
BenzeneRRR
Benzoic acidRRR
Benzoyl peroxideRRR
Boric acidRRR
Brines, saturatedRRR
Bromide (K) solutionRRR
BromineRRR
Bromine liquid, tech.RRR
Bromine water, saturated aqueousRRR
Butyl acetateRRR
Calcium chlorideRRR
Carbon disulphideRRR
Carbonic acidRRR
Carbon tetrachlorideRRR
Caustic soda & potashRRR
Cellulose paintRRR
Chlorates of Na, K, BaRRR
Chlorine, dryRRR
Chlorine, wetRRR
Chlorides of Na, K, BaRRR
Chloroacetic acidRRR
ChlorobenzeneRRR
ChloroformRRR
Chlorosulphonic acidRRR
Chromic acid (80%)RRR
Citric acidRRR
Copper salts (most)RRR
Cresylic acids (50%)RRR
CyclohexaneRRR
Detergents, syntheticRRR
Emulsifiers, concentratedRRR
EtherRRR
Fatty acids (>C6)RRR
Ferric chlorideRRR
Ferrous sulphateRRR
Fluorinated refrigerantsRRR
Fluorine, dryRRNR
Flourine, wetNDNDND
Fluorosilic acidNDNDND
Formaldehyde (40%)RRR
Formic acidRRR
Fruit juicesRRR
GelatineRRR
GlycerineRRR
GlycolsRRR
Glycol, ethyleneRRR
Glycolic acidRRR
Hexamethylene diamineRRR
HexamineRRR
HydrazineRRR
Hydrobromic acid (50%)RRR
Hydrochloric acid (10%)RRR
Hydrochloric acid (conc.)RRR
Hydrocyanic acidRRR
Hydrofluoric acid (40%)RRR
Hydrofluoric acid (75%)RRR
Hydrogen peroxide (30%)RRR
Hydrogen peroxide (30 – 90%)RRR
Hydrogen sulphideRRR
HypochloritesRRR
Hypochlorites (Na 12-14%)RRR
Iso-butyl-acetateRRR
Lactic acid (90%)RRR
Lead acetateRRR
Lead perchlorateNDNDND
Lime (CaO)RRR
Maleic acidRRR
Manganate, potassium (K)RRR
Meat juicesRRR
Mercuric chlorideRRR
MercuryRRR
MethanolRRR
Methylene chlorideRRR
Milk productsRRR
Moist airRRR
MolassesRRR
MonoethanolamineRRNR
NapthaRRR
NapthaleneRRR
Nickel saltsRRR
Nitrates of Na, K and NH3RRR
Nitric acid (<25%)RRR
Nitric acid (50%)RRR
Nitric acid (90%)RRR
Nitric acid (fuming)RRR
Nitrite (Na)RRR
NitrobenzeneRRR
Oils, dieselRRR
Oils, essentialRRR
Oils, lubricating + aromatic additivesRRR
Oils, mineralRRR
Oils, vegetable and animalRRR
Oxalic acidRRR
OzoneRRR
Paraffin waxRRR
Perchloric acidRRR
Petroleum spiritsRRND
PhenolRRR
Phosphoric acid (20%)RRR
Phosphoric acid (50%)RRR
Phosphoric acid (95%)RRR
Phosphorous chloridesRRR
Phosphorous pentoxideNDNDND
Phthalic acidRRR
Picric acidRRR
PyridineRRR
Salicyl aldehydeRRR
Sea waterRRR
Silicic acidRRR
Silicone fluidsRRR
Silver nitrateRRR
Sodium carbonateRRR
Sodium peroxideRRR
Sodium silicateRRR
Sodium sulphideRRR
Stannic chlorideRRR
StarchRRR
Sugar, syrups & jamsRRR
Sulphamic acidNDNDND
Sulphates (Na, K, Mg, Ca)RRR
SulphitesRRR
Sulphonic acidsRRR
SulphurRRR
Sulphur dioxide, dryRRR
Sulphur dioxide, wetRRR
Sulphur dioxide (96%)RRR
Sulphur trioxideRRR
Sulphuric acid (<50%)RRR
Sulphuric acid (70%)RRR
Sulphuric acid (95%)RRR
Sulphuric acid, fumingRRR
Sulphur chloridesRRR
TallowRRR
Tannic acid (10%)RRR
Tartaric acidRRR
TrichlorethyleneRRR
Urea (30%)RRR
VinegarRRR
Water, distilled.RRR
Water, softRRR
Water, hardRRR
Wetting agents (<5%)RRR
YeastRRR
Zinc chlorideRRR

Mounting CC and CL chemical resistant PTFE Seals

Tips for mounting CC and CL seals:

  • PTFE shaft seals are press fitted into receiving hole.

We recommend the sealing rings are glued into the receiving hole. Use sealing compound (e.g. Loctite 601,641)

  • Use conical fitting tool to protect sealing lip
  • Before fitting, the seal lip must be inspected for contamination/damage
  • The sealing lips must not be deformed
  • These seals require expert installation

It is important when mounting a CC and CL seal that there is a tapered end on the shaft. The required dimensions are given here in mm.

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