DBS BRIDGE STEEL / PRINTECH, REAL ZINC, ZINC

Product Introduction

Many places throughout society where cleanliness is key, such as hospitals, senior welfare facilities, public health facilities, restaurants, and public places, have recently fallen prey to environmental pollution. Unfortunately, the elderly, children, and the sick are becoming increasingly ill due to the emergence of staphylococcus aureus - a form of bacteria not affected by antibiotics. Dongbu's high quality steel sheet is coated with paint containing an inorganic anti-bacterial agent. This specially treated paint bonds the ions of crystallized aminosilicate (an alkaline earth metal) and acts as a deodorant to polar substances, non-saturated carbons, and ion exchanges. It also has heat resistant and anti-decolorization properties. As long as this special paint remains on the steel sheet, it will always keep its anti-bacterial, deodorant, and fungus resistance properties. Crafting our products to ensure the good health of people and the environment is one way Dongbu Steel enhances society.

Inside panel of a food factory
Aseptic room in a hospital
Children's play room

Anti-bacterial properties

Staphylococcus aureus / This bacterium exists within human beings and animals living in a natural environment. This bacterium is categorized as either pathogenic or non-pathogenic. Forms of this coccus include otitis, mucous disease, and meningitis.
Colon bacillus / Sterilization against colon bacillus takes place at a boiling temperature of 60℃ for 15-20 minutes. Most forms of this bacterium are non-pathogenic and live inside the human body and organs of animals. Colon bacillus causes infections and diarrhea among newborn infants.
Pseudomonas aeruginosa / Pseudomonas aeruginosa is commonly found inside the intestine. This bacterium oxidizes and dissolves sugar, causing otitis, meningitis, and pneumonia among children. This bacterium widely exists in contaminated water and is highly resistant to antibiotics.
Bacillus subtilis / This bacterium generally does not grow in a normal environment, but will germinate rapidly as circumstances become more conducive to its growth.
Anti-bacteria Properties test result

Test bacteria count	Sample name	unit	nitial Bacteria Count	After 24 hours	Inhibition Rate (%)
Staphylococcus aureus	Anti-bacterial coating steel sheet	CFU/㎖	1.0×10³	＜2	99.8
Staphylococcus aureus	Conventional coating steel sheet	CFU/㎖	1.0×10³	9.5×10²	5.0
Colon bacillus	Anti-bacterial coating steel sheet	CFU/㎖	1.0×10³	＜1	99.9
Colon bacillus	Conventional coating steel sheet	CFU/㎖	1.0×10³	1.0×10³	9.1
Pseudomonas aeruginosa	Anti-bacterial coating steel sheet	CFU/㎖	1.0×10³	5	99.5
Pseudomonas aeruginosa	Conventional coating steel sheet	CFU/㎖	1.0×10³	9.6×10²	4.0
Bacillus subtilis	Anti-bacterial coating steel sheet	CFU/㎖	1.0×10³	9	99.1
Bacillus subtilis	Conventional coating steel sheet	CFU/㎖	1.0×10³	9.5×10²	5.0

* CFU : Coliny-Forming Unit
While conventional steel sheets have an inhibition rate of 10% or less, pre-painted anti-bacterial steel sheet has a 99% or higher inhibition rate, effectively preventing the growth of bacterium such as staphylococcus aureus, colon bacillus, pseudomonas aeruginosa and bacillus subtilis.

Absorption

Gas absorption / Pre-painted anti-bacterial steel sheet has exceptional deodorant properties due to the reaction of positive ions inside the crystallized structure. This reaction is created by selective absorption of the non-saturated oxides of hydrogen (Acetylene, ethylene, propylene) and polar substances (water, hydrocarbon, sulfurous acid gas etc.)
Molecular vibration effect / The silver-zeolite, which is used as an anti-bacterial agent, has a consistent size and holds uniform levels of bacterial properties. It also selectively filters and absorbs smaller molecules.
Ion Exchange Properties / Anti-bacterial steel sheet contains exchangeable positive ions within its crystallized structure. Such free exchange activities among positive ions effectively eliminates heavy metals.
The anti-bacterial agent silver-zeolite features gas absorption, a molecular vibration effect, and ion exchange properties. These features allow our specially coated steel sheet to act as a deodorant and resist fungal and bacterial growth.

Principle of Antibiosis & Applications

Principle of Antibiosis

When coccus bacterium is absorbed on the surface of our specially coated steel sheet, the negative ion of the bacterium's cell membrane is absorbed by the positive ion of the anti-bacterial agent. As illustrated in the picture, the bacterial structure gradually weakens and then breaks, effectively eliminating it.

Applications

Commercial Products	Applications	Company
Drum of the washing machine	Blue Washer	Samsung Electronics Co., Ltd
Anti-bacterial PE, PP resin		SK Corporation
Kitchenware, chopping board (PE)	Partner	Kyeong Bong
Kitchenware (PE container)	Gild Lady	Gold Co., Ltd
Anti-bacterial ABS resin	Refrigerator, dish dryer etc.	Cheil Industries Inc.
Anti-bacterial deodorant fiber	Anti-bacterial humidifier	Samsung General Chemicals Co., Ltd.
Anti-bacterial deodorant fiber	BACSTRONG-P	Samyang Corporation
Anti-bacterial paint	Anti-bacterial powder paint	Daehan International Paint

Durability and Tolerance Level

A test of Staphylococcus aureus and Pseudomonas aeruginosa was conducted to examine tolerance levels. Live bacteria was collected and re-measured in order to identify the tolerance of anti-bacteria in terms of MIC. Tolerance was not detected, indicating that the anti-bacterial properties of anti-bacterial steel sheet are semi-permanent.

Test Frequency	MRSA	Pseudomonas aeruginosa
1	500	200
2	500	200
3	250	100
4	250	200
5	250	100
6	250	100
7	250	100
8	250	200
9	250	100
10	250	200

Non-toxicity

Zeolite, which is used in anti-bacterial agents, is closely linked to our everyday lives, as it is used as an additive for animal feed and drying materials. Silver, which is added during the ion bonding process, has also been widely used since ancient times; it was used as a material for kitchenware, dental materials, ornaments, and disinfectants. In an experiment where radioactive silver was directly injected into the stomach, 99% of bacterium was discharged. No report has been made regarding safety concerns over the use of silver- zeolite (a composite of silver and zeolite).

Specifications

Supplier : Dongbu Steel Inchon Works
Product : Anti-bacteria Property Color Coating Steel Sheet
Type : P/E, Si-P/E, Weather Resistance P/E, PVDF

Property (P/E standard)

Item	Anti-bacterial property Color Coating Steel Sheet	Remarks
Color difference	△E0.8 or lower
Polish	Basic Plate Comparison ±7
Coating thickness	Ordered Dry Film Thickness ±2μ
Bend test	3 points or higher	2 T
Impact test	3 points or higher	1.5㎏,50㎝
MEK test	40 trials or more
Pencil hardness test	2H or higher

Cross Section

Size Availability

Antibiotic Experiment

Staphylococcus aureus

Colon bacillus