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Description:
Copper Coil are soft temper (annealed) coil that are made in accordance to JIS H3300 C1220T. It is a 15 meter pancake copper coil, which different to 6 meter straight length copper tube. Copper coils are easily bend due to its soft temper attribute. This JIS H3300 C1220T copper coils are suitable for water supply, heat exchanger, and chemical applications. Copper coil are long lasting as it has better corrosion resistance, high temperature resistance, and high mechanical strength. Its long lasting criteria make it widely consumed in different industry. Copper coil can be joined by soldering, capillary fittings, or compression fittings. |
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Product Information of Copper Coils
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1. Specifications:
Copper coils are manufactured based on the requirements of specifications under JIS H3300. For JIS H3300, it is a standard that specifies expanded copper and copper alloy seamless pipes and tubes, having a round section. Copper coils are lightweight, high corrosion resistant, suitable for heat exchanger, and minimize the need of joints. The hardness and strength of coil are defined by its temper, which is drawn and annealed. Drawn temper are refers to hard temper while annealed refers to soft temper. Copper coil is a soft temper pancake coil, where it can be easily bent by hand pressure. However a suitable bending tools are recommended for bending purpose. The ease of bending makes copper coils are economical as it does not require a lot of joints. |
Copper Coils
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2. Copper Coil Attributes:
Under JIS H3300, the tensile strength for copper coil is 245 N/mm² - 324 N/mm². For Chuan Kok’s copper coils, it contains a minimum 99.90% of copper (CU) and range of phosphorus in 0.015% - 0.040%. This copper material chemical combination also known as phosphorus deoxidized copper. Deoxidized copper with phosphorus is to reduce the cuprous oxide and remove porosity by acting as oxygen removal during the manufacturing process.
Under JIS H3300, the tensile strength for copper coil is 245 N/mm² - 324 N/mm². For Chuan Kok’s copper coils, it contains a minimum 99.90% of copper (CU) and range of phosphorus in 0.015% - 0.040%. This copper material chemical combination also known as phosphorus deoxidized copper. Deoxidized copper with phosphorus is to reduce the cuprous oxide and remove porosity by acting as oxygen removal during the manufacturing process.
Alloy Grade No C1220T |
Chemical Composition (%) Copper, Cu |
Chemical Composition (%) Phosphorus, P |
Min. |
99.90 |
0.015 |
Max. |
- |
0.040 |
Copper Coils
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3. Difference Between Soft and Hard Coppers:
The temper of the copper coil determines its strength and hardness. In the pipe industry, temper may be classified into two categories: Annealed tempered, also known as soft tube, and drawn tempered, also known as hard tube. In our product range, we offer annealed tempered which is soft-typed copper coils. During installation, soft tempered copper coils are commonly connected using flare type fittings and compression fittings. Capillary fittings are also commonly used by users to join copper coils by soldering, brazing, or welding. Hard coils are a totally opposite for copper coils. They are commonly referred to as pipes and are well-known for their use in water lines. The hardening process that the stiff copper goes through makes it extremely difficult to bend, unless the heating procedure is repeated to soften it. By doing so, bending is possible. |
4. Difference Between Copper Coils and Tubes:
Copper coils and tubes are terms that can be used interchangeably. However, when it comes to measurements and dimensions, the two phrases have distinct connotations for marine engineers. Some of the distinctions between copper coils and tubes are as follows:
Copper coils and tubes are terms that can be used interchangeably. However, when it comes to measurements and dimensions, the two phrases have distinct connotations for marine engineers. Some of the distinctions between copper coils and tubes are as follows:
Characteristics |
Copper Coils |
Copper Tubes |
Shape |
Round or in cylindrical form |
Round shapes and it is straight in type. |
Specification |
Copper coils are measured in diameter. The end outer diameter connection is generally unmeasurable due to coil shape. |
Copper tube connection is classified by using the outer diameter measurement plus thickness. |
Application |
Used for projects that can admit several feet. |
Used for projects that require fewer diameters. |
5. Outer Diameter and Coil Thickness Specifications:
The copper coil outer diameter (OD) is measured by Inches and MM. For Inches OD, it is available from 1/4"OD to 7/8"OD. While for MM OD, the outer diameter size is available from 6MM to 15MM. The Table below illustrates the OD tolerance under standard JIS H3300.
The copper coil outer diameter (OD) is measured by Inches and MM. For Inches OD, it is available from 1/4"OD to 7/8"OD. While for MM OD, the outer diameter size is available from 6MM to 15MM. The Table below illustrates the OD tolerance under standard JIS H3300.
Tube OD |
Tolerance |
4MM to 15MM |
± 0.10MM |
16MM to 25MM |
± 0.11MM |
For copper coil thickness, it also available in two measurements: MM and Standard Gauges. For MM thickness, it is available in 0.9MM, 1.2MM, and 1.5MM. For Standard Gauges thickness, it is available in SWG or BWG. Below table illustrates the Standard Gauges thickness.
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6. Applications:
Capillary fittings have a socket-type end that can assist eliminate the tolerance gap between the copper coil and the connecting fittings. When both the copper coil and the capillary fittings have been cleaned and fluxed, they can produce a narrow even gap when assembled. Hence, the forces of adhesion and cohesion cause the melted solder to stick together when the solder is heated until it melts.
Step 1: Measure and cut the copper coil to the required length, being careful not to cut it too short or too long in order to achieve a proper connection.
Step 2: Sandpaper or steel wool will be used to clean the coil and capillary fittings. Once cleaned, an adequate flux will be applied, resulting in a thin layer on the mating surfaces. This is done to keep dust and debris out of the capillary gap. The joint is ready for heating after the copper coil and capillary fittings have been fluxed.
Step 3: Heat the joint. The solder is brought to the area of the capillary gap to be heated. If the solder does not melt, keep heating until it does. All around the coil, the capillary gap should be filled with enough solder. Please be cautious and avoid melting excessive solder into the capillary gap when soldering.
Step 4: Here comes the cooling process. The heated solder is allowed to entirely cool down before solidifying and completely closing the capillary gap.
Step 5: Finally, wipe the tube's outer surface with a cloth to remove any excess flux.
Capillary fittings have a socket-type end that can assist eliminate the tolerance gap between the copper coil and the connecting fittings. When both the copper coil and the capillary fittings have been cleaned and fluxed, they can produce a narrow even gap when assembled. Hence, the forces of adhesion and cohesion cause the melted solder to stick together when the solder is heated until it melts.
Step 1: Measure and cut the copper coil to the required length, being careful not to cut it too short or too long in order to achieve a proper connection.
Step 2: Sandpaper or steel wool will be used to clean the coil and capillary fittings. Once cleaned, an adequate flux will be applied, resulting in a thin layer on the mating surfaces. This is done to keep dust and debris out of the capillary gap. The joint is ready for heating after the copper coil and capillary fittings have been fluxed.
Step 3: Heat the joint. The solder is brought to the area of the capillary gap to be heated. If the solder does not melt, keep heating until it does. All around the coil, the capillary gap should be filled with enough solder. Please be cautious and avoid melting excessive solder into the capillary gap when soldering.
Step 4: Here comes the cooling process. The heated solder is allowed to entirely cool down before solidifying and completely closing the capillary gap.
Step 5: Finally, wipe the tube's outer surface with a cloth to remove any excess flux.
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FAQ Of Copper Coils
What are the diameter sizes available?
The metric size range of copper coils is measured from 6mm to 15mm.
What are the copper coil used for?
Copper coils are used for conveying liquid. It is applicable to heat exchanger, gas pipe, chemical industry, and water supply. They are commonly used in general plumbing, heating, ventilation and air-conditioning (HVAC) industry.
What is copper coil chemical composition?
Copper coil encompasses Copper (Cu) and Phosphorus (P).
Is copper coil a soft copper or hard copper?
Soft tempered type of copper coils. It is often joined with flare type fittings and compression fittings during installation process.
What is the finishing of copper coils?
Copper coils have a finishing of phosphorus deoxidized.
How to join the copper coil and capillary fittings?
Copper coil is joined with capillary fittings through soldering or brazing processes, with the working temperatures are up to 350°F (176°C).
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