Bumi Coat is a two-component, solvent based, glass-ceramic composite coating. It is resistant to low temperature of -20⁰C and high temperature resistance up to 1000⁰C continuously, if the substrates permit. The coating can be used as both primer and finish coat. Suitable for steel surfaces such as carbon steel and stainless steel, in addition to ceramic substrates. All applications are advised to adhere to the Application Guide. Application can be performed on hot substrates up to 70⁰C
The product is designed to prevent corrosion on insulated and non-insulated substrates. Corrosion Under Insulation (CUI) can be prevented. The ability of the coating to withstand high temperature makes it suitable for Chimney & Ducting (external), Boilers, High Temperature Induced Draft (ID) Fans, Thermal Power Plant, Petrochemical Industries, High Temperature Reactors, Heat Exchangers etc. With heat induced curing, the coating will become abrasion resistant, making it appropriate for Chimney & ducting (internal), Ash Conveyors, Boiler Drums, External Steam Valves and Fittings. Cured Bumi Coat can be applied in a continuously submerged environment such as water and oil tanks to prevent corrosion and substrate erosion.
Grey with matte finish.
| PROPERTY | DESCRIPTION | TEST / STANDARDS |
|---|---|---|
| Density | 1.8 – 1.9 kg/l | ASTM D5201 |
| Viscosity | Thixotropic Thick Liquid | Calculated |
| Solid by weight | 70 ± 2 % | ASTM D2369 |
| VOC | 230gms/kg | ASTM D3960 |
| Flash Point | 25 ⁰C | ASTM D3278 |
| Adhesive Strength | 900 psi | ASTM D3359 |
| Salt Spray Resistance | > 2000 hours | ASTM B117 |
The provided data is typical for factory production, subject to slight variation.
| Wet film thickness (WFT) | : 150–200microns |
| Dry film thickness (DFT) | : 120–150microns |
| Theoretical coverage | : 4.0 m²/kg |
2 coats can be applied with maximum of 200 microns WFT for each coat. A minimum of 24 hours of curing at room temperature is needed in between the first and second coat. Please refer to the “Drying and Curing time” section.
For better adhesion, all surfaces shall be clean, dry, and free from any contamination
| Substrate | Surface Preparation | ||
| Minimum | Recommended | ||
| Carbon Steel | St 2 (ISO 8501-1) | Sa 2.5 (ISO 8501-1) | |
| Stainless Steel | The substrate shall be mechanically prepared to form scratch patterns, and all forms of polish removed. | Blast Cleaning with non-metallic abrasive media to achieve sharp and angular surface profile and to remove all forms of polish | |
| Ceramic Substrate | Clean and dry surface | Clean and dry surface | |
| Coated Surfaces | Clean, dry and undamaged compatible coating | Clean, dry and undamaged compatible coating | |
BUMI COAT can be applied using 2 methods
Spray : Use Airless spray or Air Paint Sprayer / High Volume – Low Pressure (HVLP).
Brush : Recommended for smaller areas. Care must be taken to achieve required Dry Film Thickness (DFT)
| DENSITY | PARTS BY WEIGHT | PARTS BY VOLUME | |
|---|---|---|---|
| BUMI COAT PART A | 1.8 Kg/L | 100 | 100 |
| BUMI COAT PART B | 1.02 Kg/L | 2 | 3.6 |
| EXAMP LE | A=1KG, B=20g | A=1L, B=36ml |
Induction Time : 30 minutes at 25 – 40⁰C
Thinner : Xylene
Thinning is important to achieve the best spraying properties. It is recommended to thin the product by 5% (in volume ratio). Addition of thinner beyond the recommended percentage may cause sagging.
| Substrate Temperature | : 10 - 70⁰C |
| Relative humidity | : Below 85% |
| Nozzle Tip | : 4 – 5 mm |
| Pressure at nozzle (minimum) | : 7 bar/101 psi |
| Nozzle Tip | : 4 – 5 mm |
| Pressure at nozzle (minimum) | : 150 bar/2200 psi |
| Substrate Temperature | ||||
| 10⁰C | 25⁰C | 40⁰ C | ||
| Surface touch dry | 10 h | 2 h | 1 h | |
| Walk-on-dry | 24 h | 8 h | 5 h | |
| Dry to over coat (minimum) | 24 h | 8 h | 5 h | |
| Dried / cured for service | 10 d | 48 h | 12 h | |
| Surface touch dry | : The state of drying when slight pressure with a finger does not leave an imprint of reveal tackiness. |
| Walk-on-dry | : Minimum time before the coating can tolerate normal foot traffic without permanent marks, imprints or other physical damage. |
| Dry to over coat | : The recommended shortest time before the next coat can be applied. |
| Dried / cured for service | : Minimum time before the coating can be permanently exposed to the intended environment. |
Abrasion resistance of the product can be realized with heat induced (direct or indirect) curing. Curing is an additional non-compulsory process.
| 50⁰C | 100⁰ C | 150⁰ C | 200⁰ C |
| 12 h | 8 h | 2 h | 1 h |
Curing is resulted by substrates’ natural operating temperature or by other heating element such as heating torch, burner and oven.
Drying and curing times are determined under controlled temperatures and relative humidity below 85% and at average DFT of the product.
Pot Life at ambient temperature : 12 hours
| Continuous | Peak | |
| Ceramic | 1000⁰C | NA |
| Carbon Steel / Stainless Steel | 700⁰C | 800⁰C |
The temperature stated reflects the retention of protective properties. Aesthetic properties may suffer at these temperatures.
| WEIGHT (KG) | |
| BUMI COAT PART A | 5.0 KG |
| BUMI COAT PART B | 0.1 KG |
Keep the containers in a dry, cool, well ventilated place and away from sources of heat and ignition. Containers must be kept tightly closed. Handle with care
| BUMI COAT PART A | 12 months |
| BUMI COAT PART B | 24 months |
Storage temperature must not exceed 40 ⁰C.
Use under well ventilated conditions. Do not inhale spray mist. Avoid skin contact. Spillage on the skin should immediately be removed with suitable cleanser, soap and water. Eyes should be well flushed with water and medical attention provided immediately.
Colour retention may vary depending on exposure, environment such as temperature, UV intensity etc., and application quality. Product may fade and chalk when exposed to sunlight and weathering.
The information provided in this document is given to the best of MBESB’s knowledge, based on laboratory testing and practical experience. However, the condition of which the product may be used is beyond MBESB’s control. Users should always consult MBESB for general suitability of this product for their needs and specific application practices.
Technical Data Sheet (TDS) must be read in conjunction with The Application Guide (AG) and Safety Data Sheet (SDS)