Use of polycoated roofing accessories is an established practice in India, now. But, correct use of these accessories to fight corrosion and leakage through J/L roofing hooks needs customer education.
Incorrect pre-treatment : GALVANISING :
When we supplied these hooks earlier, the pretreatment given was GALVANISING before polymer coating the bolts. But, it was quite an unfriendly & non-cohesive surface for polymer coating. More glazed the galvanising, worse it was for polymer coating. We learnt from the feed back by our numerous customers that this treatment of galvanising is hardly suitable for corrosion resistance in the longer run. For over two years, we conducted trials and produced a quasi-monolithic polymer coating. This coating gives enhanced peel off force and abrasion resistance and malleability to the coat. Movement of purlins due to wind pressures, though insignificant, causes rupture of coating exposing the mother surface, giving rise to corrosion. As pioneers, in polymer coated roofing accessories, we decided to give a “perfect system” & NOT a “workable system”.
Patented Product:
Now, we have successfully invented a better surface preparation than G.I. for effective polymer coating, without compromising on corrosion resistance as observed in G.I. As a result of our research, we have perfected a process of Zinc-Phosphating the bolts instead of Galvanising before Polymer coating. The process has Patent No. 204161 Dtd. 12/01/2007. Our many esteemed customers have conducted extensive and destructive trials on these bolts. In both cases the results are astonishing. The comparison of Zinc - Phosphated Polymer coated bolts and Galvanised Polymer coated bolts, is enclosed.
Destructive test can be taken on our Zinc – Phosphated bolt and GI Polymer coated bolt by using a small hammer and a razor blade. It reveals that on razor cutting, coating on our Zinc-Phosphated bolt CAN NOT be peeled off, whereas coating of G.I. bolt will EASILY BE PEELED OFF LIKE A BANANA SKIN. On hammering, the coating it is locally dented but the coating is not removed like G.I. coated bolt. Life of these ZnPh Polycoated bolts is enormously high to that of G.I. polycoated bolts.
Universal NAGGING Problem:
NAGGING problem of LEAKAGE is universal irrespective of geographical location and type of industry. To fight this problem, our “DRIPGRIP” accessories are made from Special Virgin Polymers added with special UV Stabilizers, to resist Ozone/Ultra violet effect and Temperature factors. Its performance conforms to ASTM E-179: 81.
“DRIPGRIP” accessories consist of Thrust Washer instead of G.I. Washer, Polymer Washer (for sealing), Polymer Cap with skirting covering G.I. nut. With this information, as customer education, wise “choice” is the right product “DRIPGRIP” for any roof work. Inclusion of this in standard specifications instead of mere “Polymer coated bolts for roofing” will give right value of this “choice”.
Various Industrial Units & Consultants of worldwide repute have included in their New Standards.
“There is hardly anything in the world that A MAN cannot make a little worse and sell a little cheaper. Those who consider PRICE only are this man’s LAWFUL PREY.”
In many industries, overhead leakages from the roof and the resultant corrosion of the roofing accessories are perennial nagging problems. During marketing of our Safety Engineering products, in the past 18 years, we came across a number of events like :
Leakage produced harmful gases in a chemical warehouse followed by a
chain of events
Dripping water from the roof fell directly into a metal smelter, causing an explosion
Sugar got watered in a sugar factory godown
In a cement factory, tons of cement turned into cement stone, after roof sheets flew off
In each of the above cases the losses were colossal and the obvious reason was - leakage from the roof above. The purlin bolts were rusted & the bitumen washers cracked after some time, resulting in leakage.
Following mounting costs generally get ignored :
Frequent change avers of conventional galvanised purlin bolts
Leakproofing the roof joints with bitumen before every monsoon
Sheet damages during leakproofing, giving rise to rooftop accidents
Damages to your goods and plant & machinery due to overhead leakages
We are the pioneers in the manufacture of “DRIPGRIP” J/L bolt system for protection against corrosion of roofing bolts & prevention of leakages through them. It consists of the following :
J/L Bolt - Polymer Coated with enhanced mechanical properties.
Polywasher - Specially designed to seal the drilled / punched hole of the roof sheet.
Thrust washer - Replaces G.I. washer, thrusting the polywasher in position.
Polycap - Covers the protruded thread section of the bolt, preventing corrosion.
Accessories manufactured with foul technical processes have numerous failures like rupturing and peeling off of the coating due to poor adhesion and bond strength resulting in premature rusting and leakages. Someone rightly said, “There is hardly anything in the world that A MAN cannot make a little worse and sell a little cheaper. Those who consider PRICE only are this man’s LAWFUL PREY.”
We successfully invented better surface preparation than G.I. for effective polymer coating, without compromising on corrosion resistance property. This product is a patented product under PATENT No. 204161 Dtd. 12/01/2007.
It is necessary to standardise our product by the end users or by the consultants of the project to avoid cheating in spite of spending added costs for use of polymer coated accessories - “DRIPGRIP” system in place of conventional accessories of G.I. Bolts, Bitumen washer & G.I. Nut for this work.
“DRIPRIP” Accessories are used to avoid “DRIPPING” i.e. leakages
The Steel of the Bolt should conform to IS 1367 : 1985
The Threads of the bolt should be “ROLLED” and NOT “CUT Threaded”.
Bar Stock Dia. for 3/8” B.S.W. threading - 8.0 + 0.2 mm.
Bar Stock Dia. for 5/16” B.S.W. threading - 7.0 + 0.2 mm
These Zinc-Phosphated bolts should conform to PATENT No. 204161 Dtd. 12/01/2007.
The uncoated portion of the bolts should be treated with non-phenolic oil/s for effective corrosion resistance
The uncoated portion of the bolts should be treated with non-phenolic oil/s for effective corrosion resistance
Polymer accessories like, Washer, Thrust Washer & Cap should be made from properly blended Polymers to resist seasoning, hardening and cracking due to weather, Ultra Violet rays, Ozone effect etc
A) “DRIPRIP” Polymer Coated Bolts - J/L Hooks
The thread rolled, galvanised J/L bolts, after pretreatment, are coated with the Virgin Polymer, under a Special manufacturing process, developed by us, Thermo-Electro Fusion. The finished product is tested to ASTM B-117 modified test.
The finished product conforms to following parameters :
Coating Thickness
0.5 mm min
Temperature Resistivity
60O C max
Inert to
Normal Acid & Alkaline fumes at 70O C. Salt Water, Sultry weather, at 95% R.H. at 35O C. Performance conforming to ASTM B-117, Modified Lab. Test). (Batch Tests, as per our
Certificates.)
Abrasion Resistance
Suitable to resist Purlin movements due to Wind
Pressure.
Permisible Values
Abrasion Resistance :
Weight Loss : 20 to 25 mg. / 100 gms.
Peel off Force
2.5 to 3 Kg. / cm2 using 62.5 kgf beam
B) “DRIPRIP” Accessories :
a) Polymer Washer
Made from Special Virgin Polymers
b) Thrust Washer/Flat Washer, replacing G.I. washer
“DRIPGRIP” Roofing J / L Bolts (Hooks)
