Procedures for Coating Removal |
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Substrate |
|
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Wood |
Chemical removers, heat guns or hot plates along with scraping; power sanding (must be done with caution to avoid damaging wood) |
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Masonry |
Careful water blasting to avoid substrate damage; brush-off blasting and power tools, used with caution |
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Steel |
Abrasive blasting; water blasting |
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miscellaneous metal |
Chemicals; brush-off blast; water blast |
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Painting and Paint Additives |
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Paint (90') |
Mercury |
Lead |
Cadmium |
Copper |
Tin |
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International Micron 25 |
0.06 |
39.2 |
0.87 |
63 |
probable |
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International Leader |
< 0.03 |
170 |
1.75 |
340 |
no |
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International Copper Paint |
0.11 |
315 |
5.1 |
125 |
no |
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Renaudin KF 73 |
< 0.03 |
44.6 |
49.6 |
17 |
presente |
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Vernici Veneziani |
< 0.03 |
8.5 |
12.3 |
38.9 |
probable |
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Valentine VF 2000 |
< 0.03 |
30.1 |
54 |
303 |
no |
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International inter 86 |
87 |
405 |
4.8 |
365 |
no |
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Wiedox RAL 3002 |
0.03 |
2422 |
776 |
18.2 |
present |
||||||||||||||||||
Valentine VF 66 |
< 0.03 |
260 |
70 |
8.0 |
present |
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International TBT |
0.04 |
1.0 |
0.2 |
62 |
present |
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Querolle Plasticoque |
< 0.03 |
1.5 |
0.1 |
0.5 |
no |
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Compatibility Used Paints (coating less than 6 months old) |
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Primer of existing Coating |
Topcoat |
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Oil Drying |
Latex |
Solvent Drying |
Chemically Reacting |
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oleo -resinous |
silicone alkyd |
alkyd |
acrylic |
polyvinyl acetate |
vinyl |
chlorin -ated rubber |
epoxy |
coal epoxy |
tar ure -thane |
poly -ester |
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Oil drying |
compatible | com patible | compatible | compatible special. prep |
compatible special. prep |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
||||||||||||
Oleo -resinous alkyd |
compatible | com patible | compatible | compatible special. prep |
compatible special. prep |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
||||||||||||
Oleo -resinous silicone alkyd |
compatible | compatible | compatible | compatible special. prep |
compatible special. prep |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
||||||||||||
Latex acrylic |
compatible | com patible | compatible | compatible special. prep |
compatible special. prep |
compatible |
compatible |
not recom. |
not recom. |
not recom. |
not recom. |
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Latex polyvinyl acetate |
compatible |
compatible |
compatible |
compatible special. prep |
compatible special. prep |
compatible |
compatible |
not recom. |
not recom. |
not recom. |
not recom. |
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Solvent drying vinyl |
compatible |
compatible |
compatible |
compatible special. prep |
compatible special. prep |
compatible |
compatible |
not recom. |
not recom. |
not recom. |
not recom. |
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Solvent drying chlorinated |
compatible |
compatible |
compatible |
compatible special. prep |
compatible special. prep |
not recom. |
compatible |
not recom. |
not recom. |
not recom. |
not recom. |
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Rubber bituminous |
not recom. |
not recom. |
not recom. |
compatible special. prep |
compatible special. prep |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
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Chemically Reacting |
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epoxy |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
compatible special. prep |
not recom. |
com -patible special. prep |
compatible special. prep |
compatible special. prep |
compatible special. prep |
||||||||||||
coal tar epoxy |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
compatible special. prep |
compatible special. prep |
not recom. |
not recom. |
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zinc rich epoxy |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
compatible special. prep |
compatible special. prep |
compatible special. prep |
not recom. |
P |
not recom. |
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urethane |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
compatible special. prep |
compatible |
||||||||||||
polyester |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
not recom. |
compatible special. prep |
not recom. |
compatible special. prep |
compatible special. prep |
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inorganic zinc |
not recom. |
not recom. |
not recom. |
compatible special. prep |
not recom. |
compatible special. prep |
not recom. |
compatible special. prep |
compatible special. prep |
P |
not recom. |
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P: urethane as top coat if polyether or acrylic but not if polyester |
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TLV & other Safety Data on Paint & Cleaning Solvents |
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Solvent |
evapo -ration time |
flash point |
evaporative limits % by volume |
Threshold limit Values |
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minutes |
°C |
mini -mum |
maxi -mum |
TWA |
STEL |
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Acetone |
4 |
- 12 |
2.6 |
12.8 |
750 |
1000 |
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Benzene |
8 |
- 12 |
1.4 |
7.1 |
10 |
32 |
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Butyl Alcohol (butanol) skin |
70 |
40.5 |
1.4 |
11.2 |
50 |
|
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Carbon tetrachloride - skin |
8 |
not flammable |
5 |
|
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Di-isobutyl Ketone (DIBK) |
150 |
60 |
0.8 |
6.2 |
25 |
|
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Ethyl acetate |
8 |
4.5 |
2.5 |
9.0 |
400 |
|
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ethyl (grain) alcohol (ethanol) |
20 |
15.5 |
4.3 |
19.0 |
1000 |
|
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ethyl ether |
1 |
|
|
|
|
|
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ethylene dichloride - skin |
|
|
|
|
10 |
|
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Ethylene glycol monoethyl ether (cellosolve acetate) - skin |
100 |
43 |
2.6 |
15.7 |
5 |
|
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ethylene diamine - skin |
|
|
|
|
10 |
|
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Ethylene glycol monoethyl ether acetate (cellosolve acetate) - skin |
32 |
54 |
1.7 |
n. d. |
5 |
|
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Hi- Flash Naphta (aromatic) |
105 |
40.5 |
1.0 |
7.0 |
|
|
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Isopropyl acetate |
10 |
15 |
1.8 |
7.8 |
200 |
250 |
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Isopropyl alcohol (isopropanol) - skin |
25 |
18 |
2.5 |
12 |
200 |
250 |
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Methyele Chloride (dichloremethane) |
4 |
not flammable |
50 |
|
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Methyl Ethyl Ketone (MEK) |
8 |
8 |
1.8 |
10.0 |
200 |
300 |
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Methyl isobutyl ketone (MIBK) |
20 |
18 |
1.4 |
7.5 |
50 |
75 |
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Mineral Spirits (petroleum thinner) |
150 |
40.5 |
0.8 |
7.0 |
|
|
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Refined Kerosene |
800 |
65.5 |
0.7 |
5.0 |
|
|
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Trichloroethylene |
|
|
|
|
50 |
100 |
|||||||||||||||||
Toluen 5toluol) - skin |
15 |
7.2 |
1.3 |
7 |
50 |
100 |
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Trupentine |
100 |
40.5 |
0.8 |
n. d. |
100 |
|
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VM & P Naphta |
20 |
10 |
1.1 |
5.9 |
300 |
|
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water |
100 |
not flammable |
|
|
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xylene - skin |
35 |
29 |
1.0 |
6.0 |
100 |
150 |
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Commonly Used Methods of Surface Preparation for Coating |
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Cleaning Method |
Equipment |
Comments |
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Organic solvent |
solvent such as mineral spirits, sprayers, rags, etc. |
removes oil & grease not readily removed by other methods precautions must be taken to avoid fires & environmental contamination, local VOC regulations may restrict use |
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Detergent / power washing |
pumps, chemical, sprayers, brushes |
at pressures not exceeding 13.8MPa, removes soil, chalk, mildew, grease and oil, depending upo composition; good for smoke, stain, chalk and dirt removal |
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Acid |
chemical sprayers and brushes |
removes residual efflorescence and laitance from concrete after dry brushing, throughly rinse afterwards |
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Chemical paint strippers |
chemical, sprayers, scrapers, washing equipment |
removes from most substrates, but glow, messy and expensive; may degrade surface of wood substrates |
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Steam |
heating system pump, lines & nozzles |
removes heavy oil, grease and chalk; usually used prior to other methods |
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Water blating |
high pressure water pumps, lines and nozzles |
at pressure of 13.8MPa and above, removes loose paint from steel, concrete and wood; can damage wood or masonry unless care is taken; inhibitor generally added to water to prevent flash rusting of steel |
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Hnd tool |
wire brushers, chipping hammers and scrapers |
removes only loosely adhering contaminants; used mostly for spot repair; slow and not thorough |
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Power tool |
wire brushers, grinders, sanders, needle guns, rotatory peeners, etc. |
faster & moer thorough than hand tools because tightly adhering contaminants can be removed; some tools give a near-white condition on steel but not an angular profile; slower than abrasive blasting; some tools are fitted with vacuum collection devices. |
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Heat |
electric heat guns |
can be used to soften coatings on wood, masonry, or steel; softened coatings are scrape away, torches should not be used |
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Abrasive blasting |
sand, metal shot & metal or synthetic grit propelled onto metal by pressurized air, with or without water or centrifugal force |
typically used on metal and with care on masonry; can use recyclable abrasives; special precautions are needed when removing lead containing paint. Water may be added to control dust and its addition may require use of inhibitors. Vacuum blasting reduces dust but is slower than open. Centrifugal blasting is closed cycle system in which abrasive is thrown by spinning vaned wheel |
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