PGE India- DONIT Tesnit GRAFILIT Graphite Sheets

GRAPHILIT
High Pressure Solutions

Contents:
• Grafilit Expanded Graphite
• Crystaline Structure of Carbon
• Raw Material – Expanded Flakes
• Manufacturing Process
• Flexible Graphite Sheets
• Properties of Expanded Graphite
• Grafilit EM
• Benefits compared to tanged Graphite
• Application references
• Case Studies
• Summary
GRAFILIT
Email: pilotgaskets@gmail.com

GRAFILIT - Expanded graphite
Expanded graphite - high performance products

CARBON
GRAPHITEGRAPHITEDIAMONDDIAMOND
transparent
three dimensional crystal system
the hardest substance in nature
excellent electrical insulation
abrasive
black silver colour
hexagonal crystal system - plane structure
good conductor of electricity
soft - good sealing performance
good lubricant (low friction)

RAW MATERIAL CRYSTALLISED GRAPHITE
FLAKES
•Layer of plane hexagonally arranged carbon
atoms: PLANE OR LAMELLAR STRUCTURE
• sliding of planes
against each other:
• softness,
• lubrication
properties,
• mechanical
properties

Natural graphite flake  special chemical and thermal process
Popcorn principle  expansion 400 times its original size
Volume of 1 Litre = only 2 to 3g
EXPANDED FLAKES (WORMS)

Flexible graphite - Manufacturing process
Treatment withTreatment with
oxidising mediumoxidising medium
HH22SOSO4,4,, HNO, HNO33 & 100°C& 100°C
Water rinseWater rinse
and dryingand drying
1000°C1000°C
GraphiteGraphite
flakeflake
ExpansionExpansion
CompressionCompression
Flexible bindingFlexible binding
Max. thickness
from 0.2 to 1.0 mm
can be produced.

GRAFILIT SF pure graphite foil without insertion
GRAFILIT SL
graphite foil bonded (adhesive) to smooth stainless steel
insertion (AISI 316; 0,05 mm)
GRAFILIT SP
graphite mechanically bonded to a tanged stainless-steel
insertion (AISI 316; 0,1mm)
GRAFILIT EM
graphite reinforced with expanded stainless-steel
insertion (AISI 316L)
FLEXIBLE GRAPHITE SHEETS

• no health hazard
• no ageing because of absence of binder
• incombustible
• wide range of operating temperatures (from - 200 up to+ 550°C)
• high compressibility
• excellent adaptability to flange surfaces
• creep resistance at high temperature
• good sealing properties
• good general chemical resistance
• correspond to DIN 28091-4
PROPERTIES OF EXPANDED
GRAPHITE

• steam
• organic and non-organic acids
• petrol and petroleum products
• alcohol, ketons and solvents
• mineral oils
• heat transfer oils
• refrigerating products (freons)
Exceptions are strong oxidising media such as sulphur
trioxide, concentrated nitric, chloric and sulphuric acid...
EXCELLENT CHEMICAL
RESISTANCE against:

GRAFILIT SP - with tanged stainless-steel insertion AISI 316; 0.1mm
• higher surface stresses

GRAFILIT EM
Grafilit EM consists of high-quality expanded
graphite and an expanded metal insert made of
acid-proof stainless steel AISI 316L – 0,35mm or
1.4404, mesh aperture 3 mm (Passo 3).
The purity of the graphite is at least 98%!
Thermal and mechanical loading capacity from
- 240°C to + 550°C (in inert atmosphere up to
3000°C) with simultaneous high pressures.
Chemical resistance against all organic and
inorganic acids (except for oxidizing acids),
alkalines and solvents.
Excellent resistance to steam and thermal oils !
Properties and application Available options
Sheet sizes:
1000x1000mm
2000x1000mm
1500x1500mm
Thickness: 1,0 – 1,5 – 2,0 – 3,0mm

DONIT
GRAFILIT EM

Benefits compared to Tanged Graphite
 Higher tightness up to 50%  see Fuji Film !
 Homogeneous load distribution especially with narrow gaskets !
 Better use of surface pressure, as no crowns has to be bent !
 Due to open structure, better adaptability in between flange faces !
 Higher compressibility (45%-50%)  better recovery/elasticity !
 High Blow out resistance !
 Lower leakage rate when unloading !
 Higher flexible sheet  less vulnerable to cracks/breaking !
 Easy to cut, even with sharp scissors !
 Provides high performant seal even when segmented  Case Study !
 Easy handling  limited risk for injuries !
Conslusion:
  Grafilit EM is considered to be A very Forgivable Gasket Material !
DONIT
GRAFILIT EM

Pi
Pi
GRAFILIT EMTANGED GRAPHITE

 Chemical Industry
 Refineries
 Oil & Gas
 Shipbuilding
 Power Gen
 Pulp & Paper
 Steel Industry
 OEM
Turbines
Compressors
Heath Exchangers
Coolers
Steam Vessels
Thermal Oil Pumps
Thermal Oil Construction
Valves
Oxygen gas
.....
You name it !
Some important references:Some important references:

CUTTING on CNC FOR FINISHING

STORAGE...
• Expanded graphite is not influenced by ageing
process caused by temperature, ozone, UV rays …
• To ensure optimal conditions, store the graphite
sheets and/ or gaskets in following conditions:
• Temperature of storage: -20°C to +50°C
• Clean and dry environment – no humidity !
• Place gaskets horizontally – avoid hanging on
hooks or folding which could cause cracking
• Protect sheets and gaskets against damaging
•Specified conditions can ensure you a shelf life even
longer than 15 years !

• Coal Fired Power Station in UK from 60’s
• Gasket on steam injectors for driving turbines
• Conditions: T=565°C
P= 200bar (simultaneously !!)
OD 140 x ID100 x 1,5mm (dove-tail joint !!)
• Since ban of CAF nothing but problems
• Previous supplier could not offer solution
• Since Oct 2001 Graphite with expanded stainless steel has
been used without replacement !
Case Study : Graphite with expanded stainless
steel
CASE STUDY

Head gaskets : Air Compressors – PET Bottle production
Problem : with CNAF, tanged graphite,.. leakages !
Solution : Expanded graphite with expanded st.steel
Pressure : 0 - 40 bars
T° : up to 220°C
vibrations !
CASE STUDY

 Zero leakage
 Meets global fugitive emission regulations
 One fits all - standardize your gasket diversity
 Maximize plant safety
Reduce your costs
DONIT Certification for quality assurance
efitSs
DONIT
GRAFILSUMMARYIT EMSUMMARY

DONIT
A PERFECT FIT
P: +918080890022
W: www.pilotgaskets.com
E: pilotgaskets@gmail.com

PGE India- DONIT Tesnit GRAFILIT Graphite Sheets

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PGE India- DONIT Tesnit GRAFILIT Graphite Sheets