ISO 6330 Section 9.3 - Selection of ballast


This section of the standard states that when testing synthetic products or synthetic blends, either Type II or Type III can be used.

  • Type II ballast / makeweights: 50% Cotton / 50% Polyester
  • Type III ballast / makeweights: 100% Polyester


James Heal offer 100% Polyester Type lII ballast /makeweights for these tests, as this is a much more economical and durable product.


Type l 100% cotton ballast is also available from James Heal.


A PDF version of this FAQ is available for reference.