Q.no 1. What is ACP ?
Ans 1 ACP stands for Aluminium composite panels.
Q.no 2 What is LDPE ?
Ans 2 . LDPE stands for Low Density Polyethylene.It is used as a core of Aluminium composite Panels.
Q.no 3 What are the components of ACP ?
Qno 4 What are the various Thicknesses in which Acp Is available.?
Ans 4 . It is available in 4mm , 3mm, and 1.5mm,5mm,6mm.
Q.no 5 What is the size of ACP?
Ans 5 The width of the ACP is 1220 mm and Length varies from 2440mm ,3050mm,3660 mm.
Q.no 6 What is the Density of Aluminium Composite Panels ?
Ans 6 . The Density of the Aluminium composite Panels is 1.39 gm/cc /1390 Kg/m3. This is the reason that ACP is used as a cladding material as compared to conventional materials.
Q.no 7 Which type of coatings are used in coating aluminium composite panels ?
Ans 7 It is polyester or PvdF depending on applications. The former is for interior applications and latter for exterior applications.
Q.no 8 Which standard is followed in coating of Aluminium Coil for ACP ?
Ans 8. AAMA 2620/2605 is followed. AAMA stands for American Architectural manufacturers associations.
Q.no 9 What is Pvdf and what are it’s properties ?
Ans 9 PvDf stands for Polyvinyldiene Flouride. It is a resin added to paints to increase it’s UV – resistant properties. This happens due to the C-F electrovalent bond.
Q.no 10 Which adhesive Film is used for bonding Aluminium with PE – Core ?
Ans 10 Du pont Adhesive of Bynel series is used as an adhesive Film.
Q,no 11 What is the typical system of fixing aluminium composite Panel ?
Ans 11 The typical system of fixing acp panel is cassate system & Tray system.
In India generally Tray system is followed.
Tray system |
Cassette system |
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Qno 12 Which silicone sealant is used to seal aluminium composite Panel joint ?
Ans 12 Dow corning 789 or Dow corning 991 is used along with removable masking tape is used to seal the ACP.
Q.no 13 What are the grades of aluminium used in manufacturing ACP?
Ans 13 Generally 1100 ,3003,3105 and 5005 series are used for manufacturing acp. Selection of Aluminium grade depends on location availability and price. 3003 of aluminium is alloy aluminium having better tensile strength. The tensile strength varies from 170 N/mm2 to 190N/ mm2 giving the coil better adhesion of paints resulting in usage in coastal and marine areas.
The 3003 grade aluminium is alloyed with manganese making it for use in harsh weather conditions.
1100 grade is 99 % pure aluminium and has usage in normal conditions. The Tensile strength is between 140N/mm2 to 146 N/mm2.
1100 grade of aluminium should be used for normal applications.
Similarly 5005 grade is a better grade than 3003 having tensile strength greater than 185 N/mm2.
Q.no 14. What are the various tolerances of ACP Panel?
Ans 14. The various dimensional tolerances of Aluminium composite panels are follows.
Width - +/- 2.0mm Length - +/- 4.0mm Thickness +/- 0.2mm
Bow maximum 0.5% of the length/width
Squareness maximum 5.0mm.
Q.no 15 What is tensile strength of Metal and how it is expressed in units?
Ans 15 Tensile strength of the material is defined as strength required to resist the tensile forces acting on any material.It is expressed as Force per unit area. Tensile strength is expressed as N/mm2. When load is applied on a body the body experiences Compression and this generates an equal resisting force to regain it’s shape and this is known as Tension or Tensile strength.
Q no 16. What is flexural Strength ?
Ans 16 Flexure means Bending or Bending strength of material.This is again calculated using Bending strength formula.
Q.no 17 How Is ACP considered a Green Building Material ?
Ans 17.Yes ACP is a Green Building material. You can send specific query for this.
Q.no 18 Are Alumninium composite panels Fire Resistant ?
Ans 18 Aluminium composite panels are Fire resistant depending on the type of core material being used.Generally Mg(OH )2 is added as a non combustible material.
Q.no 19 What is the standard used for measuring Coating Properties ?
Ans 19 For measuring the coating properties AAMA 2605/2620 is used . Minimum coating thickness is 25 microns in case of Pvdf (inclusive of Primer )coatings and in case of Polyester coatings it is 15-18 microns.
Q.No 20 What is the affect of Wind Load on ACP ?
Ans 20 As the Height of the Building increases Wind Pressure on ACP increases. The wind pressure characteristics are governed by IS – 875 ( Part – III ). Generally upto 10m height wind pressure is negligible, If the structure is above 10m then proper framing arrangements as per Deflection criteria is to be used and stiffners have to be provided and 4mm ACP Panel is recommended.
Q.no 21 Which is the size of common extrusion used for fixing ACP ?
Ans 21 Fixing of ACP in external walls is done using tubular aluminium channels of size ( 38mm x 38mm x 3mm ) or ( 50mm x 25mm x 3mm ).
These extrusions are manufactured by Hindalco/Indal/ Jindal / Bhroruka etc.
Q.no 22. How is ACP Better than stone cladding ?
Ans 22. Thermal insulation reduces heat loss from Buildings. This property is highlighted in Aluminium composite panels .
Aluminium composite panels can be used in both new Buildings and for retrofit in existing buildings and is usually a low cost solution as compared to Grit wash and stone cladding.
Using Aluminium composite Panels the following advantages are achieved.- Economy and Energy conservation
Reduce the size of the air conditioning plant and Heating plant required in the building.
Reduce the annual energy consumption ( reduce the environmental pollutants like CFC’s ( Chloro Fluoro carbons )
- 2. Health, Aesthetics and safety
As the joints of Aluminium composite panels are filled with silicone sealant it prevents the risk of condensation and consequent fungi,mould,bacteria growth.
- Thermal comfort ( Thermal conductivity value ( K )
Provides thermal insulation. The thermal insulation characteristics of
Aluminium composite panels performs in two ways.
- The surface of the aluminium composite panels is coated with PvDf
Poly vinyl diene Flouride paints which are reflective in nature. Therefore amount of heat coming on the surface of acp gets reflected and a very small amount of energy gets transmitted through the PE-Core.
The PE – Core of Aluminium Composite Panels is LDPE having K – Value of λ pe = 0.29 W/m² K
Typical K Value of Natural Cladding Stone Grit Wash
Material Type |
k-Value
(Thermal Conductivity)
(W/mK) |
R-Value
Equivalent (R) 3
(Hr • ft2 • ºF / Btu) |
Granite (High Value) 1 |
1.73 |
0.083 |
Granite (Low Value) 1 |
3.98 |
0.038 |
Granite (Barre) 2 |
2.79 |
0.052 |
Limestone (High Value) 1 |
1.26 |
0.114 |
Limestone (Low Value) 1 |
1.33 |
0.108 |
Limestone ( Salem) 2 |
2.15 |
0.067 |
Marble (High Value) 1 |
2.07 |
0.070 |
Marble (Low Value) 1 |
2.94 |
0.049 |
Marble (Halston) 1 |
2.80 |
0.051 |
Sandstone
(High Value) 1 |
1.83 |
0.079 |
Sandstone
(Low Value - Berea) 2 |
2.90 |
0.050 |
Quartzite (Sioux) 1 |
5.38 |
0.027 |
The center column in the table above lists values for the thermal conductivity of the natural stone types. The k-value is a measurement of the rate of heat transfer through a solid material. If a material has a k-value of 1.00, it means that 1 square meter of material in a thickness of 1 meter will transfer heat at a rate of 1 watt for every degree Kelvin of temperature difference between opposite faces. A high value indicates the material is more conductive, and a low value means it is more insulating. The right column in the table above lists the R-value equivalent (R) of the stone in 1" thickness as measured in hours by square feet by degrees Fahrenheit per British thermal unit. The high value is the highest test score achieved in a range of samples, and the low value is the lowest test score achieved. This is the accepted method used to measure the insulating value of products.
Therefore from the available thermal conductivity values of Natural stones it is clear that the PE – Core of ACP has a lower thermal conductivity value of than the cladding stone and grit wash available.
Secondly there is concept of Airspace resistance. The fixing of aluminium composite panels is done on aluminium extrusions fixed on the walls. Thus it creates a Airspace between the wall and the ACP Back. Generally 50mm x 25mm or 50mm x 50mm extrusions are used depending on the plumb of the building.
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Air Gap |
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Therefore for unventilated cavities , thermal insulation increases with increase in cavity thickness up to a width of about 25mm to 50 mm. For larger gaps convection becomes important and insulation increases as air has a R – value of 0.17 – 0.18 m²K/ W.
Therefore Thermal conductance ( U = T/ R ) i.e R Value is 0.17 – 0.18 m² K/W therefore U = .025/0.17 – 0.18 = 0.147 – 0.138 i.e 0.14 – 0.15 W/m²K.
Therefore k value of PE –Core is 0.29 W/m²K plus the air gap i. e 0.15 W/m²K
Therefore Total Thermal Conductance = 0.29 + 0.15 = 0.44 W/m²K .
Comparing the Thermal Conductivity values with stone cladding and Grit wash the conductance values are higher and is thus less insulating as compared to Aluminium Composite Panels.
Q.no 23. What does ASTM stand for ?
Ans 23 ASTM stands for American society for testing material.
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