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Date & Time in Bali

CURRENT LOCAL DATE AND TIME IN BALI:

Monday, 10th December 2018
8:26:44 am

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P.T. BALI PREFABWORLD IS THE ONLY COMPANY IN INDONESIA THAT USES STAINLESS STEEL FOR ALL THE FIXTURES FOR ALL EXPORT MODELS (STANDARD, PREMIUM AND SUPERIOR BUILD OPTION).  

WE USE CUT TO LENGTH STEEL RODS WITH WASHERS AND NUTS TO CONNECT THE WOODEN PARTS. PLAIN CARBON STEEL IS NEVER USED. IN ADDITION NOT ONE NAIL IS USED. ONLY OUR BASIC BUILD MODELS USE GALVANIZED STEEL, HOWEVER, THESE MODELS ARE FOR LOCAL USE ONLY.

Specs-18

The use of Carbon steel (also called black carbon steel) is strongly discouraged in the wooden prefab building sector. Carbon steel has the tendency to quickly corrode (rust) in any environment, in particular when exposed (the bolt parts extending from the wood). For this reason we do NOT use carbon steel fasteners and fixtures    
Galvanization is the process of coating iron, steel or aluminum with a thin zinc layer, by passing the metal through a molten bath of zinc at a temperature of around 860 °F (460 °C) (called hot-dip galvanizing). When exposed to the atmosphere, the pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a usually dull grey, fairly strong material that stops further corrosion in many circumstances, protecting the steel below from the elements. The Indonesian quality of galvanized steel is not as good as may be expected, due to less zinc content in the hot bath, a lower dipping temperature and a faster process, which leads to a low zinc coating on bolts. The life time of galvanized bolts (Indonesian made) is as follows:

Submerged in sea water: 2 to 3 years
Unprotected and subject to salt water spray (close to open sea): 5 to 8 years
Same as above but embedded in wood (used as fastener): 10 to 15 years   
Unprotected and not subject to salt water spray (rural areas): 15 to 20 years
Same as above but embedded in wood (used as fastener): 20 to 30 years   

Stainless steel steel does not readily corrode, rust or stain with water as ordinary steel does, but despite the name it is not fully stain-proof, most notably under low oxygen, high salinity, or poor circulation environments. This in particular is true for stainless steel grade 304, whereas grade 316 is almost 100% stain free. Stainless steel is also called corrosion-resistant steel when the alloy type and grade are not detailed, particularly in the aviation industry. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and resistance to corrosion are required. Type 316 is the main stainless used in the marine environment, hence when building clsoe to open sea, with the exception of fasteners and other items where strength and wear resistance are needed, then Type 304 is typically used
Stainless steel differs from carbon steel by the amount of chromium present. Unprotected carbon steel rusts readily when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide, and due to the greater volume of the iron oxide this tends to flake and fall away. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion and blocks corrosion from spreading into the metal's internal structure, and due to the similar size of the steel and oxide ions they bond very strongly and remain attached to the surface. The pitting time (*) of Indonesian made grade 304 stainless steel is as follows:

(*) pitting time is the period in years to penetrate 1 mm into the steel

Submerged in sea water: 100 years
Unprotected and subject to salt water spray (close to open sea): 150 years
Same as above but embedded in wood (used as fastener): indefinite   
Unprotected and no subject to salt water spray (rural areas): indefinite
Same as above but embedded in wood (used as fastener): indefinite


CONCLUSION: if you will build close to open sea (*) you should opt for stainless steel grade 316 fasteners. If you wish to build for at least a 30 year life time in any rural area you should consider stainless steel grade 304. Carbon steel is totally out of the question in any environment.   
We offer our standard build option with stainless steel grade 304 fixtures. Our premium and superior build options have stainless steel grade 316 as per its standard, however, we also offer the options to use stainless steel grade 304 for both premium and superior which will reduce the price.   

(*) salty sea water aerosol can penetrate up to 20 km inland

Reviews from Bali Prefab World

"I would like to take this opportunity to thank Bali Prefabworld for its professionalism. Working with them on my San Andres project made it a breeze. They provided me with a design that was exactly what I had envisioned. Not only were the drawings perfect, they also produced them in a timely manner which is imperative when working on projects overseas. I highly recommend Bali Prefabworld to colleagues always. I look forward to working with them on future projects".
Review from: Ms. Ghada Dergham, Florida, USA
Project: Design of three 2-storey units for a small resort on the island of San Andres , Caribbean
Date: 15-02-2013
Rating: 5 out of 5

Read more testimonials from Bali Prefab World: click here
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