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LEGEND
Q-Lab exposure reports use standard ASTM rating scales. This
legend provides detailed information on the rating scales that we
have used on your report. |
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Inspection
& Reporting Standards:
Commonly used standard methods for determining degradation
effects.
Effect
Visual color
Instrumental gloss
Surface rust
Chalking
Checking
Cracking
Erosion
Blistering
Flaking
Corosion
Dirt
Mildew growth
Adhesion |
Standard
ASTM D1729
ASTM D526
ASTM D610
ASTM D4214
ASTM D660
ASTM D661
ASTM D662
ASTM D714
ASTM D772
ASTM D1654
ASTM D3274
ASTM D3274
ASTM D3359 |
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Specialized
Scales:
For factors which do not fit the typical degree rating scale.
a. Checking/Cracking
Report includes degree, type, and depth of defect noted.
Effect
10 None
8 Slight
6 Moderate
4 Pronounced
2 Severe
0 Very Severe
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Type
A Irregular
B Line & short parallel
C Switch
D Crow foot
E Mosaic
F Shrinkage
G Short Random
H Sigmoid
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Depth
A Checking
B Cracking
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Example: 6 Da = Moderate Crow
Foot Checking
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Numerical Scales:
Numerical scales are used to depict the degree of effect being
reported.
No
10
8
6
4
2
0 |
Quality
Excellent
Very good
Good
Fair
Poor
Very poor |
Change
No effect
Slight
Moderate
Pronounced
Severe
Very severe |
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b. Blistering:
Rating for blistering is a size/ frequency composite.
No.
10
8
6
4
2
0
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Descriptive
None
Pinpoint
Small
Medium
Large
Very Large
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Size
0
0-1 mm
1-2 mm
2-3 mm
3-5 mm
> 5 mm
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Rating
0
F
M
MD
D
VD
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Density
None
Few
Medium
Medium Dense
Dense
Very Dense
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| The numerical scales
are used for a wide variety of defects including in the report
such as; general appearance, chalk, dirt, mildew, color, ECT.
Odd numbers are used when the degree is obviously
intermediate. |
Example: 4 D
= medium size, dense frequency
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Visual Color Change:
Subjective appearance evaluation under standard illumination
with 10 to 0 scale.
F
D
BL
Y
DC
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Fading
Darkening
Bleaching
Yellowing
Discoloration
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All Visual Color
Reports
Will include the amount
And type of color change
Ex: 8 F = Slight Fading
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c. Scribe Rust &
Corosion
Rust creepage from a scribe line is reported using scales
derived from the distance the rust has spread from the scribe line.
This can be referenced back to either inches or millimeters.
d. Surface Area
Where the effect covers the surface of the test specimen, a
10-zero scale is used to report the percentage of area covered.
10
9
8
7 |
None
0.03%
0.1%
0.3% |
6
5
4
3 |
1 %
3%
10%
17% |
2
1
0
|
33%
50%
> 50%
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