C. Dorabji & Co. represents Polycoat Flowchem which a is one stop shop for all types of coating and lining needs for chemical, petrochemical and pharma industry.
They provide various type of chemical and corrosion resistant, high temperature linings and coatings like PTFE, FEP, PFA, PVDF, ETFE, ECTF etc.
Corrosion is the biggest enemy of chemical, petrochemical, pharmaceutical, food processing and any other industry where chemicals are used.
Advanced fluoropolymers like PTFE. FEP, PFA, PVDF, ECTF are virtually inert to most chemicals and solvents.
Fluropolymer lined or coated valves, pipes and fitting, vessels are having dual advantage of strength of steel or metal and life of polymer. They can also withstand reasonably high temperature to meet harsh challenge of an industry.
We care for environment and ecology. (Please click on the products mentioned below for the more details)
- Lined Products
- Ball Valve
- Two Piece (As per BS 5351, Short pattern)
- Three Piece (As per BS 5351, Long pattern)
- Diaphragm Valve
- Butterfly Valve
- Bottom Flush Valve
- NRV & Strainers
- Pipes and Fittings
- Pipes upto 3 mtr. Length
- 45° Elbows
- 90° Elbows
- 4 way Cross
- Concentric Reducer
- Eccentric Reducer
- Equal "TEE"
- Unequal "TEE"
- Reducing "TEE"
- Custom linings
- PTFE Coatings
- PTFE Moulded Articles
SALIENT FEATURES
General |
BODY |
: |
C.I. GRADED CASTING - IS 210, GR, 220 |
PARTS |
: |
C.S., S.S., M.S., EN 8 |
BALL |
: |
ALUMINIUM |
RATING |
: |
ASA 600, ASA 300, ASA 150 |
SIZES |
: |
25 NB TO 300 NB |
LINING THICKNESS |
: |
3 mm. |
TEMPERATURE |
: |
FOR TEFLON/FEP - 200°C |
WITHSTAND |
: |
FOR TEFLON/PFA - 260°C |
|
|
|
TESTING |
|
|
SEAT TEST |
: |
10 kg/cm2 (HYDRAULIC) |
BODY TEST |
: |
20 kg/cm2 (HYDRAULIC) |
SPARK TEST |
: |
15 KVDC |
USAGE
 |
FEP |
PFA |
CHEMICAL RESISTANCE |
EXCELLENT |
EXCELLENT |
SOLVENT RESISTANCE |
EXCELLENT |
EXCELLENT | |
APPLICATIONS : CHEMICAL, PETROCHEMICAL, FOOD AND PHARMACEUTICAL INDUSTRIES
SELECTION GUIDE
Chemical |
Recommended Lining (* indicates both are recommended) |
Resistance at Temp. in °C |
Acetic Acid |
* |
B.P. |
Acetone |
* |
B.P. |
Ammonia Liquid |
* |
B.P. |
Benzo Nitrile |
* |
B.P. |
Benzyl Alcohol |
* |
B.P. |
Bromine |
* |
93 |
n-Butyl Amine |
* |
149 |
Butyl Acetate |
* |
125 |
Carbon Di Sulfide |
* |
46 |
Cetane |
* |
51 |
Chlorine |
* |
93 |
Chloroform |
* |
62 |
Cyclohexene |
* |
148 |
Cyclohexanone |
* |
B.P. |
Di butyl phinalene |
TFE |
260 |
Di isobutyle |
* |
B.P. |
Dioxane |
* |
B.P. |
Ethyl Acetate |
* |
B.P. |
Ethyl Alcohol |
* |
204 |
Ethyl Hexate |
* |
B.P. |
Ethylene Bromide |
* |
100 |
Ethylene Glycol |
* |
204 |
Gasoline |
* |
93 |
Hydrazine |
* |
B.P. |
Hydrochloric Acid |
* |
B.P. |
Hydrofluoric Acid |
* |
B.P. |
Hydrogen Peroxide |
* |
65 |
Methyl Ethyl Keton |
* |
B.P. |
Nepthols |
* |
B.P. |
Nitric Acid |
* |
B.P. |
Nitrobenzene |
* |
B.P. |
Nitrogen Tetroxide |
* |
B.P. |
Oils, Vegetables & Animal Fats |
TFE |
204 |
Ozone |
FEP |
25 |
Perchlorethylene |
* |
B.P. |
Perfluoroxylene |
* |
B.P. |
Phenol |
* |
B.P. |
Phosphoric Acid |
* |
B.P. |
Phosphorous Pentachloride |
* |
B.P. |
Pinene |
* |
B.P. |
Piperidene |
* |
105 |
Potassium Hydroxide 60% |
* |
B.P. |
Potassium Permanganate |
* |
B.P. |
Pyridine |
* |
B.P. |
Soaps & Detergents |
* |
B.P. |
Sodium Hydroxide |
* |
B.P. |
Sodium Hypochloride 20% |
* |
B.P. |
Sodium Peroxide |
* |
B.P. |
Solvents, Alipathic & Aromatic |
TFE (May cause swelling) FEP |
204 260 |
Stannous Chloride |
TFE |
204 |
Sulfuric Acid |
FEP PFA |
260 204 |
Trichloro Acetic |
* |
B.P. |
Xylene |
* |
B.P. | |
COMMON SOLVENT EXPOSURE
Solvent |
Exposure in °C |
Exposure time |
Weight increase % |
Acetone |
-3.5 10 21 |
12 Month 12 Month 2 Weeks |
0.30 0.40 0 |
Benzene |
25 37 93 |
96 Hr. 8 Hr. 8 Hr. |
0.5 0.6 1.0 |
Carbon Tetrachloride |
-3.5 10 21 37 93 |
12 Month 12 Month 2 Weeks 8 Hr. 8 Hr. |
0.6 1.6 1.9 2.5 3.7 |
Ethyl Alcohol 95% |
-3.5 10 21 37 93 |
12 Month 12 Month 2 Weeks 8 Hr. 8 Hr. |
0 0 0 0.1 0.3 |
Ethyl Acetate |
-3.5 10 21 |
12 Months 12Months 2 Weeks |
0.5 0.7 0.7 |
Toluene |
3.5 10 21 |
12 Months 12 Months 2 Weeks |
0.3 0.6 0.6 |
|
Dip-pope Assembaly & STD Pipe Fittings |
|
|
Ball Valves |
|
|
Reducing Flange |
|
|
Equal TEES |
|
|
Steam Spacers With Side Nozzles |
|
PFA/ FEP Lined Ball Valve
PFA / FEP / PVDF lined ball valves (Globe valves) are made to confirm international standards like BS, ASA and DIN.
Application :
- Petrochemicals
- Chemical
- Pharmaceuticals
- Food Processing
They are available in two designs.
- 2 piece confirming to BS 5351 (Short Pattern)
- Two piece ball valves are shorter in length and confirms to BS 5351. Short Pattern.
- In this kind of design stem is integral part of Ball, hence lining on ball is prevented from shear in case of excessive torque.
- Flanges are drilled according to ANSI B 16.5 or it could be as per customer specifications.
- All Polycoat valve are coated with high quality, corrosion resistant polyurethane paint.
- Construction material could be customized to the specific need of the customer.

Dimension Chart
Size |
25 |
40 |
50 |
80 |
100 |
150 |
200 |
250 |
300 |
L |
127 |
165 |
178 |
203 |
229 |
267 |
297 |
330 |
358 |
P |
270 |
276 |
280 |
285 |
300 |
350 |
360 |
380 |
400 | Bill Of Material
Sr. No. |
Part Name |
Material |
1 |
Center Piece |
ASTM A 216 GR WCB |
2 |
Side Piece |
ASTM A 216 GR WCB |
3 |
Ball |
TEFLON with Metal Core |
4 |
Steam |
TEFLON line Carbon Steel |
5 |
Gland |
S.S. |
6 |
Seat Ring |
PTFE / TEFLON |
7 |
Gland Packing |
PTFE / TEFLON |
8 |
Gland Washer |
S.S. |
9 |
Cap & Handle |
M.S. or S.S. |
10 |
Stud & Nuts |
S.S. |
Lining Specification
Lining Material |
FEP / PFA / PVDF |
Lining Thickness |
3 MM All Wetted Parts |
Temperature Withstand |
FEP : 205°C Max. PFA : 265°C Max. |
Test Pressure |
Body |
20 kg / cm2 |
Seat |
10 kg / cm2 |
Spark Test |
15 KVDC |
- 3 Piece PFA, FEP, PVDF Lined Ball Valves
- 3 Piece ball valves are classic design, confirming to BS 5351, long pattern.
- Because stem is not integral part of ball, chances of lining on ball getting sheared increases incase of excessive torque.
- Flanges are drilled according to ANSI B 16.5 or it could be as per customer specifications.
- All Polycoat valve are coated with high quality, corrosion resistant polyurethane paint.
- Construction material could be customized to the specific need of the customer.

Dimension Chart
Size |
25 |
40 |
50 |
80 |
100 |
L |
127 |
165 |
203 |
241 |
305 |
P |
270 |
275 |
280 |
285 |
300 | Bill Of Material
Sr. No. |
Part Name |
Material |
1 |
Center Piece |
ASTM A 216 GR WCB |
2 |
Side Piece |
ASTM A 216 GR WCB |
3 |
Ball |
TEFLON with Metal Core ( Aluminum, SS ) |
4 |
Steam |
TEFLON Lined Cardon Steel |
5 |
Gland |
S.S. |
6 |
Seat Ring |
PTFE / TEFLON |
7 |
Gland Packing |
PTFE / TEFLON |
8 |
Gland Washer |
S.S. |
9 |
Cap & Handle |
M.S. or S.S. |
10 |
Stud & Nuts |
S.S. |
Lining Specification
Lining Material |
FEP / PFA / PVDF |
Lining Thickness |
3 MM All Wetted Parts |
Temperature Withstand |
FEP : 205°C Max. PFA : 265°C Max. |
Test Pressure |
Body |
20 kg / cm2 |
Seat |
10 kg / cm2 |
Spark Test |
15 KVDC |
Back
PFA / FEP Lined Diaphragm Valve
- Neoprene diaphragm with PTFE Lining.
- Specially formulated strong adhesive to bond rubber diaphragm and PTFE lining.
- All wetted parts are lined with 3 mm thick PFA / FEP.
- Corrosion resistant PU coating on outer surfaces.
- Available in sizes from 15 mm (1/2") to 300 mm (12")
- Length of valve confirms to BS 6165

Dimension Chart
Size |
15 |
20 |
25 |
40 |
50 |
80 |
100 |
150 |
200 |
250 |
300 |
L |
108 |
117 |
127 |
159 |
190 |
254 |
305 |
408 |
521 |
635 |
749 |
H |
100 |
110 |
120 |
160 |
200 |
240 |
280 |
315 |
360 |
450 |
520 |
ØA |
70 |
70 |
100 |
140 |
150 |
220 |
240 |
370 |
410 |
510 |
650 | Bill Of Material
Sr. No. |
Part Name |
Material |
1 |
Body |
ASTM A 216 GR WCB |
2 |
Bonnet |
ASTM A 216 GR WCB |
3 |
Spindle |
AISI 304/316 |
4 |
Compressor |
ASTM A 216 GR WCB |
5 |
Collar |
Carbon Steel |
6 |
Compressor Pin |
AISI 304 / 316 |
7 |
Bush |
ASTM A 216 GR WCB |
8 |
PTFE Diaphragm backed by Neoprene Rubber |
PTFE & NEOPRENE |
9 |
Diaphragm Stud |
Brass |
10 |
Handle Wheel |
Cast Iron |
11 |
Lock Screw |
AISI 304 / 316 |
12 |
Stud |
AISI 304 / 316 |
13 |
Grease Nipple |
Brass |
Lining Specification
Lining Material |
FEP / PFA / PVDF |
Lining Thickness |
3 MM All Wetted Parts |
Temperature Withstand |
FEP : 205°C Max. PFA : 265°C Max. |
Test Pressure |
Body |
20 kg / cm2 |
Seat |
10 kg / cm2 |
Spark Test |
15 KVDC |
Back
PFA / FEP Lined Butterfly Valve
Specifications will be displayed as early as possible.
Back
PFA / FEP Lined Bottom Flush Valve PFA/FEP lined Flush bottom or bottom flush or bottom discharge valves are used to flush tanks and are mounted on bottom. PFA/FEP lining renders it corrosion resistance.

Dimension Chart
Size |
A |
B |
C |
D |
E |
F |
G |
H |
I |
J |
50 x 25 |
152 |
90 |
40 |
100 |
108 |
25 |
150 |
220 |
50 |
150 |
80 x 50 |
190 |
127 |
70 |
160 |
152 |
50 |
330 |
430 |
78 |
200 |
100 x 80 |
230 |
160 |
88 |
220 |
190 |
75 |
400 |
500 |
100 |
200 |
150 x 100 |
305 |
210 |
140 |
320 |
230 |
100 |
500 |
600 |
150 |
250 | Bill Of Material
Sr. No. |
Part Name |
Material |
1 |
Valve Seat |
PTFE / TEFLON |
2 |
Spindle |
C.S. |
3 |
Body |
C.I. Graded Casting, W.C.B. Or S.S. |
4 |
Gland |
PTFE / TEFLON |
5 |
Bonnet |
C.S. |
6 |
Bolt |
S.S. |
7 |
Screw |
S.S. / M.S. |
8 |
Wheel |
C.S. / M.S. |
9 |
Wheel Nut |
Gun Metal |
Lining Specification
Lining Material |
TEFLON / FEP |
Lining Thickness |
3 MM All Wetted Parts |
Temperature Withstand |
FEP : 205°C Max. |
Test Pressure |
Body |
20 kg / cm2 |
Seat |
10 kg / cm2 |
Spark Test |
15 KVDC |
Back
NRV & Strainers
Ball Check NRV
- Ball check NRV (non return valve) are available in various sizes from 15 mm (1/2") to 200 mm (8").
- Option for body material in either CI, WCB or SS 150#.
- Flanges are drilled as per ANSI B 16.5 or as per customer specifications.
- All Polycoat valve are coated with high quality, corrosion resistant polyurethane paint.
Dimension Chart
Nominal Bore |
Lining Thickness (mm) |
L (mm) |
A (mm) |
inches |
mm. |
½ |
15 |
3 |
130 |
105 |
¾ |
20 |
3 |
150 |
115 |
1 |
25 |
3 |
127 |
125 |
1½ |
40 |
3 |
165 |
160 |
2 |
50 |
3 |
178 |
175 |
3 |
80 |
4 |
203 |
240 |
4 |
100 |
4 |
229 |
270 |
6 |
150 |
5 |
400 |
330 |
8 |
200 |
5 |
600 |
381 |
'Y' Strainers
Nominal Bore |
Lining Thickness (mm) |
L (mm) |
H (mm) |
inches |
mm. |
1 |
25 |
3 |
160 |
93 |
1¼ |
32 |
3 |
200 |
120 |
1½ |
40 |
3 |
200 |
120 |
2 |
50 |
4 |
230 |
145 |
3 |
80 |
4 |
310 |
185 |
4 |
100 |
4 |
350 |
220 |
Back
PFA / FEP Lined Pipes and Fittings
FEP / PFA lined pipes and fittings are best suitable for highly corrosive chemicals and petrochemical, pharmaceutical and food processing industry where no metal tubes last longer or plastic pipes are unusable because of higher service temperature and mechanical stress. Lined pipes and fittings meets extreme mechanical requirement and gives excellent performance upto 265°C (509°F).
We can supply wide range of pipes and fittings :
Back Custom Lining
Nonstandard Lined vessles, stirrers, reaction vessels, thermo couple wells, dipping pipes, headers, special pipe fittings are very common requirement of chemical, petro chemical, pharmaceuticals and food processing industry.
Our well equipped tool room and trained mold makers can meet your all custom requirement. And it does not cost heaven.
Few of such examples are illustrated under :
- Custom Lined Reaction Vessel
Custom lined reaction vessles with end covers, thermowell pipes, all nozzles are welded to body.
Custom Lined Pipe Fitting (Header) Special purpose distribution header. Having 2 nozzles.
Custom Lined Acid Tank This acid Tank used in pickling, Size: 750 mm L X 200 mm W X 200 mm H.
Custom Lined Stirrer FEP lining on stirrer, having span of 900 mm.
Back
PTFE* Coatings
PTFE (polytetrafluoroethylene) coatings are water based dispersion coating having non stick, chemical resistance and very low co efficient of friction.
- Textile sizing cylinders and rollers.
- Drying cylinder.
- Photocopier rollers.
- Cook wares.
- Toasters, grillers and similar kitchen appliances.
- Biscuit dies.
- FRP Molds
Back
PTFE Moulded Articles
Polycoat offers variety of PTFE (polytetrafluroethylene) molded basic forms like rods, sheet, bush, square bars etc.
PTFE is known for its inert and corrosion resistance properties which easily encounters various otherwise difficult combinations of pressure, temperature, speed, corrosion, moisture, fumes, abrasion, friction etc.
Out of many unique properties if put in one line statement it translate as under :
- Corrosion resistance : Practically inert to most known chemicals to mankind.
- Tough yet flexible at wide range of temperature, including cryogenic temperature.
- Lowest co efficient of friction, PTFE has second lowest coefficient of friction. Second best to Wet Ice to Wet Ice.
- Almost zero absorption of water, moisture.
- Non toxic, odor and colorless, non aging, sable under various light conditions, hygienic.
- Best electrical and dielectric properties, low power factor, no tracking.
- Ideal for sealing at elevated temperature upto 250°C.
Few Application area
Chemical & Petrochemical Industries |
Gaskets, Tubes, Gland seals, Packing, Valve seats, "O" rings, Lantern rings, Diaphragms, Thread sealant tapes, universal rope packing, flexible hoses etc. |
Electrical & Electronic Industries |
Inserts, insulators, adaptors, beads, holders for valves, connectors, spacers, sleevings etc. |
Medical & Orthopedic |
Artificial bones, ear plugs, kidneys etc. |
Aerospace Industries |
Application in this area is so wide that we really can not list it here. |
Engineering |
Bearings, piston rings, slide tracks, oil seals, gaskets, washers, diaphragm for pumps, valves, gears etc. |
Scientific Equipments |
Expansion joints, bellows, connection gaskets, crescent rings etc. |
Rubber & Tyre Industries |
Washers, seals, steam hoses etc. | |
Property Chart
Properties |
Method |
Result |
Units |
Tensile Strength @ 73°F |
D638-52T |
2000-4000 |
PSI |
Elongation @ 73°F |
 |
200-400 |
% |
Young's Modulus @ 73°F |
Standard |
0.58 4.08 |
lbft/in2 X 105 kgf/cm2 X 105 |
Flexural Strength @ 73°F |
ASTMD 790-61 |
did not break |
lbft/in2 |
Flexural Modulus @ 73°F |
ASTMD 747-61T |
50000-90000 |
lbft/in2 |
Impact strength (Izod)@ 73°F |
ASTMD 256-66 |
3.0 |
lbft/in2 |
Hardness durometer |
ASTMD 1706-59T |
D 50 - D 65 |
 |
Compressive stress @ 1% deformation @ 73°F @ 1% offset @ 73°F |
ASTM 695-52T ASTM 695-52T
|
600 1000 |
PSI PSI |
Deformation under load (122°F - 1000 PSI, 24 Hours) |
ASTM D621-59 |
2.4 |
% |
Deformation under load (122°F - 2000 PSI, 24 Hours) |
ASTM D621-59 |
15 |
% |
 |
Coefficient of linear thermal Expansion per°F 73°F - 140°F |
ASTMD 696-44 |
5.5X10-5 |
BTHU |
Thermal conductivity |
Cenco fitch Apparatus |
1.7 |
sq. ft/°F/in |
Specific heat 0-212°F range |
- |
0.25 |
BTU/ib/°F |
Head deflection temp. @ 66 psi |
ASTMD 648-56 |
250 |
o F |
Heat resistance |
Standard |
500 |
o F |
 |
Dielectric strength short time 0.080 in |
ASTMD 149-55T |
600 |
V/mil |
0.005-0.012 in |
" |
1000-2000 |
V /mil |
Volume resistivity |
ASTMD-257-57T |
10 8 |
ohm-cm |
Surface arc resistance |
ASTMD-495-56T |
>300 |
Sec. |
Dielectric constant @ 73°F 50% RH |
ASTMD 150-54T |
21 |
 |
Dissipation factor 60 to 2 X 109 cps |
ASTMD 150-59T |
0.0003 |
 |
Power factor @ 73°F 50% RH |
ASTMD 150-54T |
<0.0003 |
 |
 |
Water Absorption 24 hours |
ASTMD 570-54T |
<0.01 |
% |
Flammability |
ASTMD 635-56T |
Non-flammable |
 |
Specific gravity |
ASTMD 792-60T |
2.14 - 2.20 |
 |
Resistance to weathering |
Standard |
Excellent |
 |
Static kinetic coefficient of friction against polish steel |
Various methods used |
0.05 to 0.08 |
 | |
Teflon* - Trademark of DuPont Fluon* - Trademark of ICI Ltd.
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