At every stage of the production process, samples are tested to ensure product quality: 

1. Incoming raw material is analysed to ensure it meets the required standard and the sample  copper is checked for chemical content. 
2. The extruded shell concentricity and dimensional checks are carried out. 3. Further dimensional checks are adopted at every step of the drawing process through to  the final product. 
3. Every finished length of copper tube is tested to guarantee tube soundness. 5. Finally finished tube samples are taken to carry mechanical tests (chemical analysis, tensile  strength, hardness, elongation and eddy current). 

By taking such care in the manufacture of its copper tube, Uniflow can guarantee excellent  product quality. 

As a result, Uniflow Copper Tubes holds both the ISO 9001:2015 ‘Quality Management System’  approval and the ISO 14001:2015 ‘Environmental Management System’ approval, in addition to  the RoHS compliance certificate. 

Cleanliness and Appearance: 

As per the requirements of ASTM standards, any residue on the inner surface of the tube will not  exceed 0.038g/m2. Both the inside and outside surface diameters will be clean and bright, with the  finish being smooth and free from slivers, scale, open grain and major metal defects or inclusions.

Rishabh Metal Industries VRF/VRV range copper tubes are suitable for high-pressure refrigerants such as R410A  and R32, which are ozone friendly refrigerants. These tubes are identified and protected with pink  caps to designate they are “high pressure refrigerant tubes”. R410A for example has a 60% higher  operating pressure than R22 and requires a thicker wall tube and significantly stronger copper  fittings. The tube is also identified with ink marking along its length stating the brand name,  conforming standard and size. 

Range: 

Tubes are available from 1/4” to 2-1/8” diameter in various wall thicknesses.  Chemical and Mechanical Properties: 

RMI uses DHP grade copper tubes with copper purity of 99.9% and phosphorous content of  0.015 – 0.040% 

Barlow’s formula for internal working pressure: 

�� =2���� 

�� − 0.08�� 

Where, 

P = Allowable pressure in psi 

s = Allowable stress in psi (10,300 psi for hard drawn tubes at 150 oF or 65 oC) t = Wall thickness in inches 

D = Outside Diameter (O.D.) in inches

 General Specification: 

Quality: Uniflow ACR Tubing is manufactured to consistently meet the demands of  the air-conditioning VRF/VRV industry, and is compatible with all  

refrigerants including R410A 

Cleanliness: Bore quality meets the 0.038g/m2 ASTM B280 specified limit 

Material: C12200, Cu 99.9% min, P 0.015-0.040% min 

Mechanical  Properties: 

Tensile Strength: 290 Mpa (min) Elongation: 3% (min) 

Hardness: >100 HV 

Temper: Hard Drawn 

Packaging: Bored internally cleaned and capped 

Bending: Not suitable for bending 

Length: Manufactured in 10ft lengths, other lengths available on request

General Specifications: 

Quality: Uniflow ACR Tubing is manufactured to consistently meet the  demands of the air-conditioning VRF/VRV industry, and is compatible  

with all refrigerants including R410A 

Cleanliness: Bore quality meets the 0.038g/m2 ASTM B280 specified limit Material: C12200, Cu 99.9% min, P 0.015-0.040% min 

Mechanical  Properties: 

Tensile Strength: 205 Mpa (min) Elongation: 40% (min) 

Hardness: <60 HV 

Temper: Soft Annealed 

Packaging: Bored internally cleaned and capped, double layer coils Bending: Suitable for bending with or without specialised tooling Length: Manufactured in 50ft (15.24m) rolls