Rubber Expansion Joints

Rubber Bellows Construction Details

Material

A Rubber Expansion Joint is flexible connector fabricated of natural or synthetic elastomers, fluoroplastics and fabrics and, if necessary, metallic reinforcements used to absorb movements in a piping system while containing pressure and a medium running through it.

MACOGA rubber expansion joints are designed following the guidelines of the FSA (Fluid Sealing Association) Non-Metallic Expansion Joints Technical Handbook, ASTM F1123 - 87 Standard Specification for Non-Metallic Expansion Joints and always complying with the European Pressure Equipment Directive 2014/68/UE for the specified operating conditions.

MACOGA Rubber Expansion Joints are manufactured considering:

  • Chemical and Temperature resistance of internal layers
  • Pressure-resistant reinforcing fabrics
  • Weather, ozone and UV-resistance of external layers

Body

Colour label
Abbreviation
Name
Temp. range ºC
Properties
Application
RED
EPDM
Ethylene Propylene Diene Monomer
-35 to +100
Weather-resistant, good gas tightness, resistant to attack by oxygen, U.V., ozone and extreme weather environments.
Hot water, cooling water with salt solutions, chlorine solutions, esters and ketones
DOUBLE RED
EPDM HT
Ethylene Propylene Diene Monomer HT
-35 to +140
Special EPDM rubber compound suitable for high temperature up to 140 °C applications without hardening. Weather-resistant, good gas tightness, resistant to attack by oxygen, U.V., ozone and extreme weather environments.
High temperature applications up to 140 °C. Hot water, cooling water with salt solutions, chlorine solutions, ester, ketones, compressed air (oil free) and chemicals except for hydrocarbons.
RED+WHITE
EPDM DW
Ethylene Propylene Diene Monomer DW
-35 to +90
FDA approved.
Drinking water.
YELLOW
NBR NITRILE
Nitrile Butadiene Rubber
-40 to +90
Good general resistance to oils and hydrocarbons. Good mechanical properties especially tensile strength, flexibility, compression set and impermeability to gases. Moderate ageing properties. Good abrasion resistance.
Oil and fuel, also suitable for gases, solvents and fats. Mineral oils, vegetal and animal oils, oils aerosols, butane or propane gas.
Not suitable for steam and hot water.
DOUBLE YELLOW
NBR HT
Nitrile Butadiene Rubber HP
-40 to +140
Good general resistance to oils and hydrocarbons. Good mechanical properties especially tensile strength, flexibility, compression set and impermeability to gases. Moderate ageing properties. Good abrasion resistance.
High temperature applications up to 140 °C. Oil and fuel, also suitable for gases, solvents and fats. Mineral oils, vegetal and animal oils, oils aerosols, butane or propane gas.
Not suitable for steam and hot water.
WHITE
NBR-W
White Nitrile Butadiene Rubber
-20 to +90
FDA approved material and has good resistance to oils and greases.
Foodstuff, good for pulps, flours, juices and wines. Food and beverages, including fats and oils.
GREEN
CSM HYPALON
Chloro-sulphonated polyethylene synthetic rubber
-20 to +90
Excellent resistance to oxidation. Outstanding resistance to atmospheric conditions and in particular strong sunlight and ozone.
CSM compounds resist fire and are self-extinguishing.
Strong and/or concentrated acids and bases, freons, hydroxides, ozone, compressed air that bears oil aerosols, etc.
BLUE
SBR
Styrenebutadiene rubber
-25 to +85
Good resistance to abrasion. Excellent mechanical properties. Only moderate resistance to tearing, ozone and general weathering.
Wearing material such as sludge suspended stones, calcium, etC.
BLACK
CR NEOPRENE
Polychloroprene
-25 to +90
The best multi-function rubber. Good resistance to temperature changes, ozone action and adverse weather conditions. Good mechanical and abrasion properties.
Resistance to chemicals; resistant to inorganic chemical products except oxidizing acids and halogens. Moderate resistance to aliphatic hydrocarbons.
Water, warm water, seawater, air and weak acids. Suitable for some small groups of acids as well as compressed air and lightly oil-related media.
RED+BLUE
IIR BUTYL
Isobutylene isoprene rubber
-30 to +120
Low gas permeability. Good ozone and weather resistance. Resistant to oxidizing agents, vegetable and animal fats and polar solvents. Poor wear resistance. Not resistant to hydrocarbon solvent and oil.
Animal and veg. oils, fats, greases, air, gas, water, many oxidizing chemicals and ozone.
BROWN
NRL NATURAL RUBBER
Natural rubber
-25 to +80
Excellent mechanical properties. It has excellent tensile, elongation, tear resistance and resilience. Excellent abrasion resistance and excellent low temperature flexibility. Poor resistance to ozone, oxygen, sunlight and heat. It has poor resistance to solvents and petroleum products.
Seawater, sewage, resist weak acids and alkalis. Up to 65 °C it has a good resistance against: hydrochloric acid in any concentration, sulfuric acid up to 50% concentration, sodium hydroxide, diluted and concentrated potassium hydroxide.
GRAY
BR POLYBUTADIENE
Polybutadiene
-40 to +80
Excellent mechanical properties. Excellent abrasion resistance and excellent low temperature flexibility. Poor resistance to attack by petroleum oils, poor ozone, UV resistance.
Up to 65 °C it has a good resistance against: hydrochloric acid in any concentration, sulfuric acid up to 50% concentration, sodium hydroxide, diluted and concentrated potassium hydroxide.
PURPLE
VITON FKM (ASTM) FPM (DIN/ISO)
Fluorine-polymer
-20 to +150
Good flame resistance, resistance to oxygen, ozone and natural weathering. Poor performance against ethers, ketones, and bases.
High concentrated chemicals up to 150 °C. Hydrocarbons, aliphatic, aromatic and chlorinated chemicals. Good resistance to acids and alkali’s including oxidants. Good resistance to chemicals, oils, combustibles and solvents.

Fabric reinforcements:
Nylon ©, Polyester, Aramid or Kevlar ©

Metal reinforcements:
Wire or solid steel strings are imbedded in the carcass and are used as strengthening members of the Expansion Joint.

Quality Approvals

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