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Year 1989 - Inception of Vardhman Stampings

Year 2000 - Certified with ISO 9001:2000 Certification from DNV, Netherlands, first of its kind then among Indian lamination processors

Year 2002 - approved by PGCIL* in 220 kV class in ring core category

Year 2004 - First in India among lamination processors to install CNC GEORG cut-to-length line having capacity to cut 1000 mm width and 5500 mm in length with Step-Lap Cutting and Auto Stacking facility

Year 2006 - Started processing / promoting to use Fully Step Lap Core

Year 2006 - Approved in 132 kV class by PGCIL* for transformer lamination

Year 2006 - Added one more CNC Cut-to-Length line of 640mm and CNC Slitting Line of 1000 mm width

Year 2007 - Upgraded to 220kV class transformer lamination BY PGCIL*

Year 2007 - Installed UNICORE machine for manufacturing wound core ( single & three phase transformer )

Year 2007 - Installed CNC slitting line of 1000mm and semi automatic Cut-to Length line of 400 mm width

Year 2008 - Approved in 400 kV class by PGCIL*

Year 2008 - Got approval to process transformer lamination up to 1000mm width and 5500mm length by NTPC**

Year 2008 - Successfully audited for Six Sigma - Achieved Three Star rating

Year 2008 - Started production of Radiators for Power and Distribution transformers

Year 2008 - Acquired Government recognized Star Export House.

Year 2008 - Dr. BROCKHAUSE Quality lab comprised with facilities of FRANKLIN Tester, Epstein Tester, Single Sheet and Ring Core Tester.

Year 2009 - Installed CNC-cut to length line of 1000mm width having facility of Step-Lap cutting & auto stacking.

Year 2009 - Certified with OHSAS 18001 : 2007 Certification from DNV, Netherlands, first and only of its kind in indian lamination processors.

Year 2010 -
ELECRAMA - 2010
20th - 24th Jan 2010
Stall No. H6 N38

Year 2010 -
MEE SHOW - 2010
09th - 11th Feb 2010
Dubai, Stall No. 2E38

Quality Practise
› Home › Quality Practise › Raw Material Testing

Quality Raw Material Testing

All the incoming raw materials are examined at VARDHMAN-Dr. BROCKHAUS Laboratory with following testing facility

  • Single Sheet Tester
  • Ring Core Tester
  • Epstein Tester
  • Franklin Insulation Resistance Testing Machine
  • Bend Test
  • Stacking factor test

The acceptance norms for above tests are mentioned below:

Sr. No. Tests Acceptance Norms
1 Bend Test or Brittleness Test Min. 5 Bends
0-180° Bending Of Sample
(Size :- 305 X 30 mm)
2 Stacking factor test As Per Diff. Grade
0.23 – 95.5%
0.27 – 96.0%
0.30 – 96.0%
0.35 – 96.5%
3 Surface Insulation Resistivity Test as per Franklien Test Method. > Min. 10Ohm/Cm2.
4 Core Loss Test
(By Epstein Square Test Method)
W/kg. at specific flux density for
Diff. Grades from Coils
(At start and end of the coil)
5 A/c Permeability Test Min. 1.75T at 800AT/m & 50Hz
for conventional G.O. Steel and
Min. 1.85T at 800AT/m & 50Hz
for high permeability G.O. steel

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