cpr systems | carl labs paint adhesion testing

7/29/2019 CPR Systems | CARL Labs Paint Adhesion Testing

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CARL Testing Outline of Surface Cleaning Investigation

30 Test Panels 5 X 8

30 Steel

Grease & Oil Applied to Each Panel: per standardized method

using Pennzoil 705 white grease and Mystic JT-8 SAE 10W/40

heavy duty motor oil

3 Cleaning Processes Utilized to Clean the Pre-Soiled Panels: Tophalf of panels received light wipe with cotton/pulp fiber towel;

bottom half received cleaning by one of following:

1) Alkaline Wipe (2.3% solution at room temperature)

2) Solvent Wipe (xylene at room temperature)

3) Podell Cleaning System (2000 psi power spray at 160F)

5 Different Paint Types Applied1) Water-Based Epoxy

2) VOC-Based Enamel

3) VOC-Based Epoxy (Two Part Chemistry)

4) VOC-Based Urethane (Two Part Chemistry)

5) Epoxy Powder Coating

Adhesion Test Performed On All Panels per ASTM-3359

Higher grade of adhesion for various coatings would

indicate that a particular cleaning type offers better

cleaning characteristics compared to others


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Steel

Oil & Grease

Contaminate

Water Based Epoxy

Single Component

Solvent Wipe Alkaline Wipe G. Podell Clean

Lightly Dirty

rag wipe

Steel

Oil & Grease

Contaminant

Enamel

Steel

Oil & Grease

Contaminant

Solvent Based

Epoxy Two Component

Steel

Oil & Grease

Contaminant

Urethane

Two Component

Number

Of Samples

6

6

6

6

Podell CPR/CARL Test Sample Preparation

and Sample Description

Steel

Oil & GreaseContaminant

Powder Coating

6

Top Half of Coupon

Bottom Half of Coupon

Lightly Dirty

rag wipe

Lightly Dirty

rag wipe

30


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Contaminated (soiled) metal panels according

to ASTM process (dwell time 24 hrs.)

Cleaned, metal panels racked for drying (dwell

time 24 hrs.) prior to application of paint


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Paint application to each metal panel. The paint was

applied to the lightly cleaned top half and to the more

aggressively cleaned bottom half. Paint applied via

metered draw bar. Set of two panels per each paintsystem, one received 3 wet mils and the other received 6

wet mils.

Staging of painted metal panels (drying dwell

time 7 days) prior to adhesion testing

Draw

Bar


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Array of painted metal panels after

performing the ASTM-3359 adhesion test

Angled cutting edges makes thecross-hatch marks on the painted

paint. A special adhesion testing

tape is used to test paints

adhesion to the panel


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Adhesion Quality Scoring

5 B - Best Quality

2 to 3 B - low Quality

0 to 1 B Very Poor Quality


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PC # T C M T C T D T T V T T V PC # T C M T C T D T T V T T V PC # T C M T C T D T T V T T V

11 GPHPP S SW-VE 5 B 5 B 41 A W R T S SW-VE 0 B 0 B 71 X W S SW-VE 3 B 3 B

12 GPHPP S SW-VE 5 B 5 B 42 A W R T S SW-VE 0 B 0 B 72 X W S SW-VE 3 B 3 B

13 GPHPP S SW-WE 5 B 5 B 43 A W R T S SW-WE 0 B 0 B 73 X W S SW-WE 0 B 0 B

14 GPHPP S SW-WE 5 B 5 B 44 A W R T S SW-WE 0 B 0 B 74 X W S SW-WE 0 B 0 B

15 GPHPP S V-VE 5 B 5 B 45 A W R T S V-VE 0 B 0 B 75 X W S V-VE 5 B 5 B

16 GPHPP S V-VE 5 B 5 B 46 A W R T S V-VE 0 B 0 B 76 X W S V-VE 5 B 5 B

17 GPHPP S U 5 B 5 B 47 A W R T S U 0 B 0 B 77 X W S U 0 B 0 B

18 GPHPP S U 5 B 4 B 48 A W R T S U 0 B 0 B 78 X W S U 0 B 0 B

19 GPHPP S P C 5 B 5 B 49 A W R T S P C 3 B 2 B 79 X W S P C 5 B 5 B

20 GPHPP S P C 5 B 5 B 50 A W R T S P C 5 B 5 B 80 X W S P C 5 B 5 B

21 GPHPP G SW-VE 0 B 1 B 51 A W R T G SW-VE 1 B 1 B 81 X W G SW-VE 4 B 4 B

22 GPHPP G SW-VE 4 B 4 B 52 A W R T G SW-VE 2 B 1 B 82 X W G SW-VE 4 B 4 B

23 GPHPP G SW-WE 5 B 3 B 53 A W R T G SW-WE 0 B 0 B 83 X W G SW-WE 0 B 0 B

24 GPHPP G SW-WE 4 B 3 B 54 A W R T G SW-WE 0 B 0 B 84 X W G SW-WE 1 B 4 B

25 GPHPP G V-VE 5 B 5 B 55 A W R T G V-VE 2 B 0 B 85 X W G V-VE 5 B 5 B

26 GPHPP G V-VE 5 B 5 B 56 A W R T G V-VE 2 B 2 B 86 X W G V-VE 5 B 5 B

27 GPHPP G U 0 B 0 B 57 A W R T G U 0 B 0 B 87 X W G U 0 B 0 B

28 GPHPP G U 0 B 0 B 58 A W R T G U 0 B 0 B 88 X W G U 1 B 2 B

29 GPHPP G P C 5 B 5 B 59 A W R T G P C 5 B 5 B 89 X W G P C 5 B 5 B

30 GPHPP G P C 5 B 5 B 60 A W R T G P C 2 B 4 B 90 X W G P C 5 B 5 B

Rating 1st 2nd Ttl Wtd Sc. Rating 1st 2nd Ttl Wtd Sc. Rating 1st 2nd Ttl Wtd Sc.

5 B 15 13 28 140 5 B 2 2 4 20 5 B 8 8 16 80

4 B 2 2 4 16 4 B 0 2 2 8 4 B 2 3 5 20

3 B 0 2 2 6 3 B 1 1 2 6 3 B 2 2 4 12

2 B 0 0 0 0 2 B 4 0 4 8 2 B 0 1 1 2

1 B 0 1 1 1 1 B 1 2 3 3 1 B 2 0 2 2

0 B 3 2 5 0 0 B 12 13 25 0 0 B 6 6 12 0

Totals 20 20 40 163 Totals 20 20 40 45 Totals 20 20 40 116

T C Type of Cleaning Galvanized Steel is excluded from this summary

M T Metal Type because little adhesion was demonstrated on it.

C T D Coating-Type Designation

T T V Tape Test Value per ASTM-3359 Powder Coat was least effective with RT-Alkaline

GPHPP G. Podell Hi Pressure Phosphate wipe, as was every thing else; Rag-Wipe excepted.

A W R T Alkaline Wipe - Room Temperature

X W Xylene Wipe - Room Temperature Order of cleaner effectiveness:

S Steel GPHPP 163

G GalvanilX W 116

SW-VE Sherwin-Williams VOC Enamel A W R T 45

SW-WE Sherwin-Williams Water/Epoxy

V-VE Valspar VOC/Epoxy

U Urethane

P C Powder Coat

Total Adhesion Values Summed

T. G. Podell CPR System 163Xylene Wipe 116

Alkaline Wipe 45

Test Generated Data


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Executive Summary of Test Results

Steel: Podell CPR cleaning provided very good adhesion

values for all of the coating types.

Alkaline wipe cleaning provided poor adhesion values

for all coating types with the exception of the powder

coating which appeared to adhere well to the steel

substrate.

Xylene wipe cleaning provided good adhesion values

for the VOC epoxy and the Powder Coating types.However, the other coating types did not adhere well

to the xylene wiped steel substrate

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