Table 8.

Score matrix and hole enlargement behaviour penalty for calculation of RD values using Method 2

Bursting Strength (kPa)	< 250	250–299		300–349			350–399		400–449	450–499		500–549		550–599		600–649			650 − 600	≥ 700
Bursting Strength Score	1	2.5		5			7.5		10	12.5		15		17.5		20			22.5	25
Snag Strength (N)	< 20	20–39		40–59			60–79		80–99	100–119		120–139		140–159		160–179			180–199	≥ 200
Snag Strength Score	1	2.5		5			7.5		10	12.5		15		17.5		20			22.5	25
Abrasion Resistance (rubs)	< 25		25–50		75–100			125–150		175–200			250		300			350		≥ 400
Abrasion Resistance Score	1		3		6			9		13			16		19			22		25
Hole Enlargement (mm)	≥ 21 mm							20 − 6 mm							≤ 5 mm
Hole Enlargement Resistance Score	10							20							25
Secondary Damage	Laddering					Unravelling											Tearing combined with Laddering or Unravelling
Secondary Damage Penalty	10					20											30
Penalty Score	=Secondary damage penalty*Hole enlargement resistance score/100