Raw material:

BOSS Sealing Solutions seal rings are made from these materials below:

PTFE
This homopolymer of tetra fluoro ethylenehas many outstanding properties. It’s chemical resistance is superior to any other thermoplastic or elastomer and it has excellent resistance to swelling in almost all known media. This non toxic material has low co-efficient of friction and is non flammable. It’s electrical insulation properties are also outstanding . Service temperature range is -270 Degrees Celsius to 260 Degrees Celsius.

BOSS Sealing PTFE materials Including Virgin PTFE/Bronze filled PTFE/Graphite filled PTFE/Carbon fiber filled PTFE/Glass fiber filled PTFE/ Polyphenyl ester filled PTFE/MoS2 filled PTFE,etc.

Some typical filled PTFE material:

15% glass filled PTFE;

PTFE+15% glass fiber+5% MOS2;

25% glassed filled PTFE;

35% graphite filled PTFE;

15% graphite filled PTFE;

35% carbon filled PTFE;

25% carbon filled PTFE;

15% carbon filled PTFE;

40% bronze filled PTFE;

60% bronze filled PTFE;

G453, 23% carbon + 2% graphite filled PTFE;

G418, 5%glass fiber+5%MoS2

Ekonol+PTFE;

F410PI: 10% Polyimide(PI) filled PTFE;

Others available

PU

Including TPU and CPU.These variety of polyurethanes give the highest tensile strength in polyurethanesand are thermoplastic in nature. They bridge the gap between conventional elastomers and thermoplastics.

The abrasion resistance of these materials are excellent and they have much better load bearing capacity than conventional elastomers.

Components of PU don’t crack despite repeated bending and have much better impact resistance than conventional thermoplastics.They have very good resistance to ageing weathering, ozone, oxidation, water, mineral oils, motor fuels, hydraulic fluids and solvents. Normal service temperature of these materials are – 20 Degrees Celsius to 120 Degrees Celsius.

PEEK

Melting point is 130-136℃, density is 0.94 g/cm3,hardness is shore 40-60 D. It still has high impact property in -70℃, hold the toughness and strength in -196℃, long-term working temperature is -180℃-90℃. While the shortcomings are: stretch and pressure resistance is not enough, high temperature resistance is weak, the hardness is low.

PCTFE

Melting point is 210-230℃, density is 2.10-2.18g/cm3,  hardness is Shore 75-90 D.

PCTFE has good rigidity, low temperature resistance, cold flow resistance, which is the ideal seal material for low temperature and high pressure working condition.

PCTFE is specially used in high and new technology, which can hold the elasticity in -265℃, and could be long used in -200-125℃ condition.

UHMW-PE

Melting point is 130-136℃, density is 0.94 g/cm3,hardness is shore 40-60 D.

It still has high impact property in -70℃, hold the toughness and strength in -196℃, long-term working temperature is -180℃-90℃. 

While the shortcomings are: stretch and pressure resistance is not enough, high temperature resistance is weak, the hardness is low.

NBR
This polymer which is commonly reffered to as Nitrile or Buna-N is a co-polymer of Butadiene and Acryonitrile . They are differentiated based on the percentage of bound Acryonitrile (ACN) content in the polymer.
The low ACN polymers have good low temperature flexibility, compression set resistance and good elastic properties, but moderate resistance to oils and fuels. As the ACN content increases, resistance to mineral oils, fuels and greases increases, but properties such as low temperature flexibility, compression set resistance and elasticity deteriorate. Medium ACN polymers exhibit good balance of all the above properties. Normal service temperatures of these polymers range from -25 Degrees Celsius to 120 Degrees Celsius.

CR
This polymer is based on 2-chloro – 1,3 butadiene and is commonly referred to as Neoprene. The chief characteristics of the polymer an flame retardancy, excellent ageing properties in ozone and weather environments along with resistance to abrasion and flex fatigue.

Polymers Range: Polychloroprene rubber (CR). This polymer is based on 2-chloro – 1,3 butadiene and is commonly referred to as Neoprene. The chief characteristics of the polymer an flame retardancy, excellent ageing properties in ozone and weather environments along with resistance to abrasion and flex fatigue. Polychloroprene exhibits good resistance to mineral oils with high aniline point, greases, refrigerants and water.

EPDM
This polymer is a terpolymer of ethylene, propylene and some Diene as the termonomer. Moulded parts and seals from EPDM have good resistance to :
-Ozone, ageing and weathering
-Water and steam
-Dilute acid, alkalies, ketones, alcohols and polar organic media
-Phosphate ester based hydraulic fluids.

VMQ
These are high molecular weight poly organo siloxanes. VMQ has both Vinyl and Methyl substituent groups on the polymer chain, while PVMQ has an additional Phenyl substituent group on the polymer chain.

These polymers have excellent cold flexibility as well as high thermal resistance. They have excellent di-electric properties and very good resistance to attack by oxygen, ozone and sunlight. They however have moderate resistance to mineral oils . The most admirable property of this polymer is it’s very wide service temperature range i.e -65 Degrees Celsius to 250 Degrees Celsius.

FKM
These versatile range of polymers are used for a vast range of sealing applications due to its resistance to a broad spectrum of chemical and oil media and a wide range of temperatures. The co-polymer types of FKM are co-polymers of Hexa fluoropropylene (HFP) and Vinylidine difluoride (VF2) (Fluorine content = 65-66%) While the terpolymers have Tetra fluoroethylene (TFE) as the Termonomer (Fluorine content = 67-71%). Some terpolymers have an additional cure site monomer which are used for very special applications.

FFKM
Perfluoroelastomer (FFKM), this unique material which endures the harshest known environments can now be supplied by us in the form of moulded O-Rings as per Customer specification.

FFKM has unbeatable resistance to concentrated acids, alkalis, steam, organic alcohols, ketones & esters. It has an attractive wide service temperature range from -25 ℃ to 300℃.

FFKM is also immune to sudden changes in service environments and lasts much longer than conventional elastomers including FPM

HSN(HNBR)
The elimination of double bonds from the polymer chain of NBR, either partially or completely by hydrogenation gives Hydrogenated Nitrile rubber.
These polymers have much improved heat resistance than NBR (heat resistance depends on the degree of hydrogenation).

HNBR has outstanding resistance to heat, ozone, weathering, mineral oils, crude oils with amines, fuels, greases, aliphatic hydrocarbons and industrial chemicals HNBR has very good mechanical properties and excellent wear resistance. Normal service temperatures of these polymers are -30 d.c to 150 d.c.

SBR
This is a co polymer of Butadiene and Styrene. This general purpose polymer has good resistance to dilute organic and in organic acids water,alcohols and brake fluids.
Normal service temperatures of this polymer is -40 d.c to 110 d.c.

POM
This thermoplastic material is also referred to Poly acetal. This material due to it’s good stiffness, hardness and strength has the ability to take very high loads. In certain applications it can replace metal parts like brass and aluminium. It also exhibits better dimensional stability than other thermoplastics in moist condition due to it’s very low water absorption.
Normal service temperatures of this material is -40 d.c to 140 d.c.

NYLON(PA)
This family of thermoplastics is widely used for anti-extrusion purposes and other sealing applications. Nylon is resistant to various petroleum and phosphate ester based hydraulic fluids.
Normal service temperatures are -50 d.c to 120 d.c.

Semi-products:

PEEK rod,PEEK Sheet,PEEK tubes;

PU rod,PU sheet,PU tubes,PU plates;

MC Nylon rod,MC Nylon tubes,MC Nylon sheet;

POM rod,POM sheet,POM tubes…

PTFE rod,PTF tube,PTFE sheet