Expandable Graphite

Expandable graphite and flexible graphite


The expandable graphite is a kind of high-ranking sealing material. With features of heatproof, abrasive resistance, anticorrosion, oxidation resistance, great surfactivity and strong adsorbability, it is a replacement for traditional sealing materials such as asbestos, rubber and some metallic materials in making various sealing parts in pump, valve, pressure vessel and pipelines.


Using expandable graphite as an intumescent flame retardant in synthetic materials has attracted more and more interests in both research and industry circles in recent years. Differ to normal expandable graphite, which is mainly used for making expanded graphite sealing material, the flame retardant grade expandable graphite has its special properties.


Nowadays, expandable graphite had been used in plastics, rubbers (elastomers), coatings, textiles and especially in polymeric foams.
Product Name:
32mesh, 50mesh, 80mesh, 100mesh
Performance:
Non-toxic; Not soluble in water and other solvents; Smoke reduction and reduction of toxic gas; Improved thermal conductivity
Purpose:

Foam Products

Due to its easy ignition and rapid fire spread rate, reducing fire risk for polymeric foam products had always been considered as a top priority. Now expandable graphite had been used in PU foam. Such flame retarded PU foam had been used as seat material in aircraft and other traffic tools. It was also used as heat and sound insulation sheet for car after special treatment.
In building industry, such flame retarded PU foam has been used as sealing tape in windows and doors. Besides used in PU foam, expandable graphite was also used at EVA foam and now is of interest to be used in EPS foam.


Coating
Expandable graphite had been found its application in intumescent flame retarded coatings. Fine particle size expandable graphite had been used in steel structure flame retarded coatings in many countries.


Polyolefins
Expandable graphite had already been used in PE, PP and other POs when halogenated flame retardant was forbidden use, although up to know after using expandable graphite the mechanical property would be reduced more or less. Expandable graphite was mainly used in Plastics /Metal (Al) composite board at the moment.


Bitumen Roof Sheets
Recently expandable graphite had been used in bitumen roof sheets. For this application the black colour was not a barrier for use. Expandable graphite has very good flame retardancy to bitumen roof material.


Other applications
In China, using steel pipes as waste water pipes in buildings are not allowed now. Plastics pipes now are commonly used for rain water pipes and waste water pipes. Anti-fire ring then is forced to be used by regulation when the pipes pass through floors. Expandable graphite had been used in such rings by large amount. Together with resin and other additives, expandable graphite expanded during fire and then sealed the space caused by its melting or burning of the plastics pipes.


In other applications like fire-stop putties, fire-stop pillows, expandable graphite had replaced other intumescent agents and used widely.
In the back adhesives of carpets, we could also find the existing of expandable graphite.

Specifications:

Expansible graphite technical index: 
1. Ultra low sulfur expansible graphite 


Specifications

Carbon fixed (%)

Ash
(%)

Volatile matter(%)

Expansion ratio(ml/g)

Sulfur content
(%)

PH

Moisture(%)

Size (% )
Under sieve

TL32

90-99.9

≤8.0

≤10

200-400

≤0.03

3-7

≤1.0

≥80

TL50

90-99.9

≤8.0

≤10

200-350

≤0.03

3-7

≤1.0

≥80

TL80

90-99.9

≤8.0

≤10

150-250

≤0.03

3-7

≤1.0

≥80

TL100

90-99.9

≤8.0

≤10

100-200

≤0.03

3-7

≤1.0

≥80

This product advantage: sulfur for can be controlled in minimum range.


2. Super fine expansible graphite 


Specifications

 Carbon fixed (%)

Ash
(%)

Volatile matter(%)

Expansion ratio(ml/g)

Sulfur content
(%)

PH

 

Moisture(%)

Size (% )
Under sieve

TX-100

90-99

≤8.0

≤15

30-120

≤2.2

4-7

≤1.0

≥80

TX-200

90-99

≤8.0

≤15

15-50

≤2.2

4-7

≤1.0

≥80

TX-325

90-99

≤8.0

≤15

10-20

≤2.2

4-7

≤1.0

≥80

This product advantage: sulfur for can be controlled in minimum range.

3. Ordinary expansible graphite 


Specifications

 Carbon fixed (%)

Ash
(%)

Volatile matter(%)

Expansion ratio(ml/g)

Sulfur content
(%)

PH

Moisture(%)

Size (% )
Under sieve

TK32

90-99.9

≤8.0

≤12

200-400

≤2.2

3-7

≤1.0

≥80

TK50

90-99.9

≤8.0

≤12

200-350

≤2.2

3-7

≤1.0

≥80

TK80

90-99.9

≤8.0

≤12

150-250

≤2.2

3-7

≤1.0

≥80

TK100

90-99.9

≤8.0

≤12

100-200

≤2.2

3-7

≤1.0

≥80

This product advantage: sulfur for can be controlled in minimum range.

Specifications could be adjusted according to users’ requirements.