Gabion FAQ
ASTM Specifications

Double Twisted Hexagonal Mesh Gabion Baskets and Mattresses have been used world wide for retaining wall, slope stabilization, channel lining, rockfall protection and many other applications for over 100 years. Due to the low cost long term solution double twisted mesh gabions provide for these applications their usage has become common place with many Government Agencies.

As gabion usage grew domestically the requirement for an industry standard of product quality became vital to ensure material consistency. The AMERICAN SOCIETY OF MATERIALS AND TESTING has long been recognized as requiring high quality standards and assisting industries in establishing an industry standard for specific materials and products. The AMERICAN SOCIETY OF MATERIALS AND TESTING (ASTM) publishes a specification book which documents each specification in its entire format. Each individual product specification within the ASTM book is designated a specification numberfor reference. The ASTM specification number for Double Twisted Hexagonal Mesh Gabions is ASTM A975-97.

The full version of ASTM A975-97 specification is not shown in its entirety. The performance requirements of the finished product and the material data information are represented.
STRENGTH REQUIREMENTS: ASTM A 975-97

Minimum Strength And Performance Requirements Of Double Twisted Hexagonal Mesh Ggabions

TEST DESCRIPTION GALVANIZED/GALFAN GABION PVC COATED GABION
Tensile strength of wire mesh parallel to twist 3500 lbs/ft 2900 lbs/ft
Tensile strength of wire mesh perpendicular to twist 1800 lbs/ft 1400 lbs/ft
Connection to selvedges 1400 lbs/ft 1200 lbs/ft
Panel to Panel 1400 lbs/ft 1200 lbs/ft
Punch strength of mesh 6000 lbs/ft 5300 lbs/ft

Material Requirements For Galvanized Double Twisted Hexagonal Gabions

Diameter of mesh wire 0.120 inches
Diameter of selvedge wire 0.153 inches
Diameter of lacing wire 0.091 inches
Coating of wire Finish 5 class 3 zinc coating ASTM A-641 tested in accordance with ASTM A370-92
Tensile of wire 54,000-70,000 psi soft temper accordance with ASTM A641-92
Weight of zinc coating of wire Determined by ASTM A-90
Mesh opening size 8x10cm or 3.25inches x 4.50inches
Mesh wire 0.120 inches Weight of zinc coating 0.85 oz/sf
Selvedge wire 0.153 inches Weight of zinc coating 0.90 oz/sf
Lacing wire 0.091 inches Weight of zinc coating 0.80 oz/sf
Grade of zinc coating of wire High grade or special high grade in accordance with ASTM B-6, Table 1
Uniformity of coating of wire Determined by ASTM A-239
Elongation Not less than 12% in accordance with ASTM A370-92

All of the above wire diameters are subject to a tolerance limit of 0.05mm ~ 0.10mm in accordance with ASTM A-641.
TOLERANCES: All gabion dimensions shall be within a tolerance limit of plus or minus 5% of the manufacturers stated dimensions.