The solid glass beads incorporated in the
mixture comply with the Class A Category of BS 6088 :1981 :
The solid glass beads sprayed onto the surface of the line
must comply with Class B Category of BS 6088:1981 :
SEIVE
% RETAINED
1.18 mm
0 - 3
850 um
5 - 20
425 um
65 - 95
Below 425 um
0 - 10
Minimum
spherical beads by mass 70%
SEIVE
% RETAINED
850 um
0 - 5
600 um
5 - 20
300 um
30 - 70
180 um
10 - 30
Below 180 um
0 - 15
Minimum spherical
beads by mass 80%
PIGMENT: - For white markings, the pigment is titanium dioxide
(anatase or rutile), complying with BS 1851, and its content is such as to give a minimum
luminance factor of the material of 70. (See appendix F).
- For yellow markings, the pigment is a lead chromate which is sufficiently heat stable.
The pigment content used will depend on the colour required by the engineer.
- The total content of pigment and extender is between 18% and 22%.
PERFORMANCE: - DENSITY: approximtely 2.0
- FLASH
POINT: Open flash point above 235°C.
- SOFTENING
POINT: measured by the Ring & Ball method (BS 2000) is at least:
95°C
Tropical grade
85°C
Semi-tropical grade
65°C
Temperate grade
- LUMINANCE:
not less than 70 for white, and 50 for yellow.
- FLOW
RESISTANCE: The percentage decrease in the height of the cone of REDA
Thermoplastic is not more than 25% after testing for 48 hrs. at 40C° (tropical or
semi-tropical grades) or 23°C (temperte grade).
- SKID
RESISTANCE: The skid resistance of a laboratory prepared sample of REDA
Thermoplastic is not less than 45.
APPLICATION THICKNESS: Screed
lines: not less than 2.0 mm nor more than 5.0 mm. Sprayed lines other than yellow:
not less than 1.5 mm. Sprayed yellow edge lines (no waiting
etc.): not less than 0.8 mm. Extruded lines: not
less than 2.5 mm or more than 3.5 mm.
- The minimum thickness specified is exclusive of surface applied solid glass beads, the
determination of thickness shall be in accordance with BS 3262.
Minimum
spherical beads by mass 70%