Technical Data Explained
Our extensive product selection offers a vast choice of colours, sizes, textures and decorative
finishes for the resin surfacing industry. However as products encompass varied market sectors, it is
important to understand the part aggregates play in ensuring the suitability, performance and life
expectancy of the finished surface. Where applicable, industry recognised full technical data is
supplied and listed for the majority of our products. A brief explanation of these industry standards
are listed below. To further assist as a guide to the products’ suitability, and where industry data is
not available, we have included a number index rating between 1 and 5 for all of our products,
defined in the table below.
PSV = Polished Stone Value
The resistance of an aggregate to polishing and therefore
a measure of skid resistance. PSV should not be viewed in
isolation as aggregates with a high PSV may be likely to
abrade easily (high AAV). PSV values in excess of 58 are
generally acceptable for highway wearing courses.
SRV = Skid Resistance Value
A measure of the skid resistance of aggregate within the
texture of a system. The greater value the higher the skid
AAV = Aggregate Abrasion Value
The resistance of an aggregate to abrasion. The lower the
AAV, the more resistant the aggregate is to wearing.
Values of less than 16 are acceptable for highway
Technical Data Sheets
We supply full technical data,
including grading, physical
and chemical analysis on our
full product range which can
be downloaded directly from
our website or requested via a
member of our sales team.
AIV = Aggregate Impact Value
The resistance of an aggregate to impact stress produced
from a moving vehicle. Values of less than 20 are
acceptable for highway wearing courses.
ACV = Aggregate Crushing Value
The resistance of an aggregate to crushing. The lower the
ACV the more resistant the aggregate is to crushing.
LA = Los Angeles Coefficient
The resistance of fragmentation is a measure of the
toughness of an aggregate and is viewed as a
representative measure of both degradation and
crushing stress values. Values less than 30 are acceptable
for highway wearing courses.
Some of the gravel and shingle supplied may occasionally
contain very minor concentrations of iron minerals, which
upon weathering may result in areas of rust staining. These
iron minerals occur naturally within the gravel deposits and
DGS Services cannot be held responsible for any loss
or damage suffered as a result of rust staining. By way of
guidance to users of our products we have included the risk
of iron staining (RIS) assessment on our range of gravels and
shingles. This guide is purely a subjective assessment, based
on our own experience with these products and may be
subject to change as our database expands.
This scale is defined as follows:
* No likelihood of any rust staining
** No previous recorded instances of rust staining within
*** Potential for rust staining within this rock type with
1) Performance Index Suitability Note
Product only suited for use within bound systems,
for foot traffic use.
2) Product suited to all bound systems and bonded
systems primarily for foot trafficked areas or areas
of occasional domestic, light traffic.
3) Product suited to all bound systems and bonded
systems subject to a medium degree of vehicular
traffic, including vans but not heavy goods.
4) Product suited to all bound systems and bonded
systems subject to heavy wear from continual
traffic including vans but not heavy goods.
5) Product suited to all bound systems and bonded
systems subject to heavy wear from all forms of
transport including heavy goods.