CORRIOSION ESPECIALLY OCCURS AT WELD JOINTS, DUE

TO THE DISSIMILAR METALS AND WITHOUT EXCEPTION ALL LEAKS OCCUR AT THE WELD JOINTS

STRONGMETAL COLD WELD CERAMIC PUTTY (WORLD’s ONLY ROOM TEMPERATURE CURABLE EPOXY PHENOLIC COATING)

BACKGROUND:

Epoxies are excellent for pH 4 – 14. (i.e. slightly acidic to very alkaline). Reasonable good temperature

resistance (i.e. upto 120 deg C continuous). Poor solvent resistance. The best epoxies have a molecular

weight of around 800. Advantage: Room Temperature curable.

Phenolic resins are excellent for pH 1 – 9 (i.e. very acidic to slightly alkaline). Excellent temperature

resistance (i.e. upto 300 deg C continuous). Excellent solvent resistance. Phenolic resins start with a

molecular weight of 30,000 and goes up further. Disadvantage: Can be bake cured only.

Dissimilar metals are the chief cause of corrosion in metals (i.e. weld joints) STRONGMETAL COLDWELD CERAMIC PUTTY (Blue Colour Cold Weld Compound) Weld joints at all points to be sealed with the cold weld compound on the outer sides of all weld joints, to prevent any ingress of moisture and corrosion. Making the tank last for as long as 10 years.

STRONGMETAL COLDWELD COMPOUNDS INSTRUCTIONS FOR USE

PLEASE READ CAREFULLY BEFORE USE • ROUGHEN THE SURFACE (IF POSSIBLE ) WITH EMERY PAPER /WIRE BRUSH / FILE AND CLEAN THE SURFACE. • DEGREASE THE SURFACE WITH A GOOD SOLVENT ( TRICHLOROETHYLENE / ACETONE/ CTC/ M.E.K., etc.) • STRONGMETAL SHOULD BE APPLIED ON TO A CLEAN DRY SURFACE ONLY. (Except STRONGMETAL OL {ONLINE GRADE} which is suitable on oily & damp surfaces also.) » INDIRECT HEAT APPLIED ON TO THE REPAIRED AREA FACILITATES FASTER & MORE COMPLETE CURE AND IS ADVISABLE FOR BETTER CHEMICAL & MECHANICAL RESISTANCE. {A 100 W LAMP PLACED AT AROUND 10-12 inches of the repaired area for around 4-6 hours is recommended} • STRONGMETAL BASE & HARDENER (ACTIVATOR) must be mixed 1:1 Ratio thoroughly with good mixing. • Mix the two thoroughly in the Mixing Cup (provided) with the Mixing & Applicator Knife (provided) for 2-5 mins. • Apply onto the cleaned , abraded, degreased surface to be repaired ensuring that no air bubbles are entrapped while application on the area to be repaired. ========================================================================== FOR APPLICATION ON OLD/CHEMICAL CONTAMINATED SURFACE (For Best Results) For application on Old / Chemical Contaminated surface please ensure that the surface is first Neutralised. If the contamination is of Acidic pH ,'neutralise with a Mild Alkali , rinse with water , dry , roughen the surface and degrease the surface with a low Boiling Point Solvent before repair with STRONGMETAL. If the contaminated surface is of Alkaline pH, neutralise with a Mild Acid and follow the procedure as given above. CLEANING All tools used for application of STRONGMETAL must be cleaned with solvent immediately after use. OPERATING SAFETY Avoid eye and skin contact. In case of skin contact, wash with soap and water . In case of eye contact, rinse thoroughly with water. THIS TECHNICAL INFORMATION IS FOR ADVICE ONLY AND IS BELIEVED TO BE RELIABLE. AS THE USE AND APPLICATION OF THE PRODUCT IS BEYOND OUR CONTROL IT IS THEREFORE THE USE'S RESPONSIBILITY ONLY. TYPICAL PHYSICAL PROPERTIES OF THE STRONGMETAL RANGE: 1. Shear 100 - 150 Kg/cm2. Compressive: 800-1400 Kg/cm2. Resis. Hydraulic Pres.: 150-250 Kg/cm2. Peak Heat Rests.: 200-280 oC . Hardness: 80 - 85 Shore 'D'. Full Functional Strength ( at 30oC ) : 6 Hours. MIXING RATIO: Vol.- 10 : 1

Chemical resistance chart: Films unaffected by a 3 months immersion in the following reagents at room

temperature [all solutions are in water]

Alcohol:

Ethyl Isopropyl Secondary

butyl n- Butyl Methyl isobutyl

Neosol Neosol A Diacetone

Hexylene glycol Glycerine

Organic Chlorides:

Carbon tetrachloride Allyl

chloride

Ketones & aldehydes:

Methyl isobutyl ketone

Formaldehyde, 30%

Cyclic hydrocarbons:

Toluene

Xylene

Ethers: Diethyl ether

Bis (beta-chloroethyl) ether

Bases:

Sodium hydroxide (all conc.)

Ammonium hydroxide, 10%

Acids:

Acetic, 1%

Linseed fatty Sulphuric, upto

75% Hydrochloric, upto 20%

Nitric, upto 10%

Phosphoric, upto 85%

Misc. reagents:

Liquid detergent, 100%

Solid detergent, 1%

Resitoxaphene

Sodium methoxide, 40% in methanol Sodium

chlotite, 25%

Sodium hypochlorite, 5%

Calcium hypochlorite, 5%

Ferric chloride, 5%

Water

Salt spray at 38 deg. C for 500 hr.

Films unaffected by the following materials, all

exposed for 3 weeks at 66 deg. C, except as

noted:

Isopropyl alcohol Secondary butyl alcohol Methyl

isobutyl carbinol Neosol Neosol A

Diacetone alcohol Hexylene glycol Methyl isobutyl

ketone Allyl chloride

20% Sodium hydroxide boiling for 24 hrs.

73% sodium hydroxide at 138 deg. C for 2

weeks

Glycerine

Glycerine at 77 deg. C for 6 weeks Water

Films slightly soften in 1 months exposure at room

temperature to acetone, M.E.K., Ethylene

dichloride, HCI (36%), H2S04 (78%), and H202

(15%). The coating has limited resistance to

sulphuric acid at conc. > 85% and H202 at conc. >

15%.

COLUMN (a) STRONGMETAL COLUMN (b) DEVCON PUTTIES

DEVCON PUTTY SPECS. TAKEN FROM THEIR DATA SHEET (AS AVAILABLE ON THE NET & THE INDIAN NAVY)

STRONGMETAL PUTTIES TESTED FOR SHEAR, COMPRESSION, FLEXURAL, SHORE “D” AT TCR ENGG. SERVS. (P)

LTD. MUMBAI (an accredited TEST LAB)

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USING C.R.C.’s [e.g. STRONGMETAL COLDWELD PUTTIES] for Metalworking and repairs to metals. Turning. Repaired areas may be turned with conventional steel tools, although best results are obtained with diamond or tungsten carbide tips. It is important that the tool be correctly ground, with the feather edge being removed. The speed should be medium to high and the feed should be low. A speed of 800 rpm, a feed of 0.0025 in. per rev, and a cut of 0.004 in. have been found to be satisfactory for use with unfilled systems and those containing nonabrasive fillers, although a better surface finish can be obtained if the feed is reduced to 0.001 in. per rev. Surface-finish values (rms) of 20 to 90 are attainable easily. Filled epoxies [e.g. STRONGMETAL GRADES except Epoxy Sealer] require gentler handling, and a speed of 200 to 300 rpm 6s recommended. The working piece should be supported, and care should be taken to prevent over- heating. Drilling. Normal high-speed and high-spiral drills are preferred. The feed should be slow. Excessive heat should be avoided to prevent cracking. Cutting Threads. With a tool bit on a lathe, the tool should be ground with just enough angle to clear the lead of thread. A radius of Y16 in. or more is needed to produce the necessary cutting or shaving action on both cutting edges. A cut of between 0.005 and 0.010 in. is recommended. When using a tap, it may be necessary to grind the hook angle to obtain the correct cutting or shaving angle. When using a die, it may be helpful to warm the workpiece to 70'C or so in an oven if difficulty is encountered at ambient. Sawing. The thickness of the workpiece will determine the 'selection of the saw. For general purposes, 12 to 14 teeth per in. will be found satisfactory. Grinding. Diamond-faced wheels are the most satisfactory, and it is important to use a coolant and a slow feed. If this is not done, there may be sufficient heating to produce undesirable stresses or dimensional changes. Milling, shaping, routing, and cutting may be undertaken, but, bearing in mind the equipment available, the operator is the best person to determine the type of tool to be used. Turning. They can be turned at speeds from 400 to 800 fpm surface speed. Drilling and Punching. High-spiral drills have been found to be best, with point angles greater than 90' being recommended when inspection standards are high. For punching, tool-steel dies are satisfactory for short run, with hard-chrome plating on both punch and die being used for production. Only very large production runs would justify the expense of carbide-tipped punches. In general, punches and dies should be oversize by about 3 per cent of the material thickness. Sawing. Bandsaws are most economical for production runs. The life of steel bandsaws can be prolonged five – or tenfold by hard-chrome plating the blades, these running at about 800 surface fpm. Diamond-tipped bandsaws are most economical for long production runs, these operating at about 3 surface fpm. Diamond-tipped circular saws generally operate at about 13,000 rpm, and for cutting jobs thicker than ½ in. should be operated with a coolant. Metal To properly prepare a metal surface: 1) If the surface is oily or greasy, degrease it with T.C.E., C.T.C. or Acetone. 2) Abrasive-blast the surface with 25-40 grit (or coarser) to produce a good surface profile. If you cannot abrasive-blast the surface, use a 60 grit or coarser sandpaper to achieve a similar result. 3) Make repairs as soon as possible after blasting the substrate to avoid oxidation or flash rusting.

THEORITICAL COVERAGE AREAS IN SQ. FT. FOR VARIOUS COATING THICKNESS (in mm.) Coating Thickness

Dens. Coverage Dens. Coverage Dens. Coverage Dens. Coverage

1 mm 1 10.2 1.6 6.34 1.8 5.7 2.0 5.1 2 mm 5.1 3.2 2.8 2.6 3 mm 3.4 2.2 1.9 1.7 4 mm 2.6 1.3 1.42 1.3 5 mm 2.04 1.3 1.13 1.02 6 mm 1.7 1.06 0.94 0.85 1 mm 2.2 4.64 2.4 4.3 2.6 3.9 2.8 3.64 2 mm 2.32 2.13 1.96 1.82 3 mm 1.55 1.42 1.31 1.21 4 mm 1.16 1.06 0.98 0.91 5 mm 0.93 0.85 0.79 0.73 6 mm 0.77 0.71 0.65 0.61 Please note: The above values are theoretical, the Actual Coverage shall be between 15 – 20% lower than the above values due to the uneven surfaces to be coated.

100 microns = 0.1 mm = 4 mil. PAINT SPREAD CALCULATIONS DRY FILM THICKNESS ONLY. Spread rates at various Film Thickness mil microns Coverage (sq.ft) Coverage (sq.m.)2 50 215 20 3 75 143 13.3 4 100 108 10 5 125 86 8 6 150 72 6.7 7 175 62 5.7 8 200 54 5.0 9 225 48 4.4 10 250 43 4.0 Please Note: The above values are theoretical. Actual Coverage shall be lower by 15 – 20% than the above due to uneven surfaces to be coated.