Quality control:

Based on the quality control system, Thai Ductile Industry Co., Ltd. ensures high quality products through applying close in-process control and extensive testing and inspection with accurate equipments and strict criteria.


Parameter monitored and controlled


Properties test, Moisture, Clay content, Grain fineness, Hardness, Strength, Shear, Impact

Pig iron,scrap iron



scratch hardness


Carbon Equivalent, Spectrometer


Test bars for bending test & Chill

Material test

Test bar for Brinell & Tensile, Metallurgical Microscope

Finished product

Fluorescent inspection
X-ray inspection
Dimensional layout
Ultra-sonic testing
Visual inspection

Solid proof: certificates


I . Quality Management System Certificate:

ISO 9002:1994 in Dec 1999 from URS.
ISO 9001:2000 since Dec 2001 from URS ISO 9001:2008
Since May 2010 from URS

II. GL Certificate Jan. 2013
Approved for manufacture of Lamellar Cast Iron acc. to EN1561
and Nodular Cast Iron acc. to EN1563. since October 2000 from Germanisher Lloyd.

III. GL Certificate Jan. 2013
PED Certificate of Nudular cast iron according to EN 1563 & Lamella cast iron according to En 1561 (for Valves) since May 2004 from Germanisher Lloyd.

IV. GL Certificate Jan. 2013
Approved all products comply in every respects with AD2000-Merkblatter
W3/1, W3/2, A4. since March 2005 from Germanisher Lloyd.

V. DNV Certificate Nov.2012
Approved for manufacture of Iron Castings acc. to Det Norske Veritas 's Rules. Since October 2000

VI. LR Certificate Nov.2012
Lloy's Register for Casting of Spheroidal Graphite Iron. Since October 2000

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