Teachnical Service Report

VIVILON
Miami, FL

TSR #97-2702-2501-264
February 26, 1998

OBJECTIVE:

To incorporate various mildewcide/algaecide compounds into a customer submitted sample of acrylic clear lacquer and evaluate properties of mildew and algae resistance with ASTM procedures D5590-94 and D5589-94.

CONCLUSION:

All samples tested provided complete resistance to Algae defacement including the unprotected control sample.

The results of the algae resistance evaluation are presented in Table II. A growth rating of “0” corresponds to the complete absence of growth and a rating of “10” to complete coverage of the surface by algae growth. A sample is considered resistant of algal defacement if a “0” rating is attained after six weeks.

EXPERIMENTAL:

The samples were prepared for the algae evaluation of wooded test blocks and leached in the same manner described previously. Two blocks from each sample were placed on the surface of solidified Allen’s agar plates and inoculated with a mixed algae suspension of Green and Blue Green algae (Chlorrela sp, ATTCC 7516 and Scenedesmus quadricauda ATCC 11460, Calothrix sp, ATCC 27914 and Gleocapsa sp, ATCC 29115). All plates were incubated at 25°C under 85-90% relative humidity for six weeks, under a light dark cycle of l4:10 hours. Observations of growth were recorded weekly.

Daniel Brown
Industrial Biocides Technology

DHB/aas
N.B. Ref. 328-61

NOTE: The unprotected control sample mentioned in this report is the VIVILON Classic with nothing added to it for algae protection. This is because the polymer resins in VIVILON provide their own natural algae protection.

Table II
Ressistance To Algae Defacement
Six Week Agar Plate Test
             
Growth Ratings (1)
    Leached   Unleached
Sample Week(s) 1 2 3 4 5 6   1 2 3 4 5 6
Control no biocide   0 0 0 0 0 0   0 0 0 0 0 0
w/0.45 wt% TuffCide 500   0 0 0 0 0 0   0 0 0 0 0 0
w/0.90 wt% TuffCide 500   0 0 0 0 0 0   0 0 0 0 0 0
w/0.45 wt% TuffCide 500/0.03 wt% NuoCide 1071   0 0 0 0 0 0   0 0 0 0 0 0
w/0.90 wt% TuffCide 500 /0.03 wt% NuoCide 1071   0 0 0 0 0 0   0 0 0 0 0 0
w/0.50 wt% Fungitrol 420   0 0 0 0 0 0   0 0 0 0 0 0
w/1.0 wt% Fungitrol 420   0 0 0 0 0 0   0 0 0 0 0 0
w/0.03 wt% NuoCide 1071   0 0 0 0 0 0   0 0 0 0 0 0
w/0.015 wt% NuoCide 1071   0 0 0 0 0 0   0 0 0 0 0 0

Legend:

1. Growth ratings are on a scale of "0" to "10", where "0" corresponds to the complete absence of algae growth, and "10" corresponds to complete coverage by alage.