STEEL IT Low V.O.C. Epoxy System

Anti-corrosion from alkali, solvents, brackish water, abrasions

The two-component low VOC epoxy system is composed of primer type 4220 and finish coat type 4908.

Both 4220 primer and  4908 finish coat consist of a blend of  two-component polyamide resins where AISI 316 L stainless steel micro flakes of various sizes have been embedded.

They differ from the “classic” epoxy system (4210+4907) for the low content of volatile organic compound (VOC), lower than 250 gr/lt. and the resulting higher solid content and coverage.

PROTECTION 

Against corrosion from light and strong alkali, solvents and chemical products, sea water, impacts and abrasion.

USES 

Industrial mills and machines, packaging and wrapping lines, pumps, valves, slides, vehicles, etc.

SURFACES 

Steel, aluminium, copper and other metals, cast iron, wood, fibreboard, tiles, glass, ceramic, masonite, and fibreglass.

PREPARATION 

For light conditions of use: treat with a hand or electric metallic brush, after completely removing dirt, grease, oil and every other pollutant. Preferably sandblast to SA 2 or 2½. For severe conditions of use including chemical agents: sand blast to SA 3 with sharp and angular profile 40-50 µ deep.

THICKNESSES

Surfaces exposed to light atmospheric or chemical agents:
1 coat of 4220 primer   at 75 µ dry /105 µ wet
1 coat of 4908 finish  paint   at 75 µ dry /110 µ wet
Surfaces in immersion service or exposed to strong chemical agents:
1 coat  of 4220 primer   at 125µ dry /175 µ wet
2 coats of 4908 finish paint at 100 µ dry /150 µ wet each coat

Note: Film thickness on sand blasted surfaces should be measured up from the peaks of the anchor pattern.

APPLICATION

– Conventional spray gun with vertical reservoir, nozzle 1,6 – 1,8  mm.,  nozzle pressure 4 – 4,5 bar.
– Airless gun pump ratio 28:1 nozzle size 0,4 – 0,5 mm.
– Brush. Roller.
– Do not apply by dipping.

Clean tools (especially nozzles) immediately after use with a commercial solvent.
  
Note: The stainless steel flakes tend to make a deposit on the bottom of the can and therefore we recommend stirring the product frequently before and during application. A possible presence of small lumps due to stocking time is normal; they can be eliminated easily by accurate stirring.
We strongly recommend using a low speed electric mixer in every stirring operation in order to obtain the best adhesion and protection results.
Note: do not mix primer and finish paint together.

MIXING 

Stir with care the two A and B components separately, then mix them accurately in a clean container with the mixing ratio 1:1 by volume (the two components have different specific gravity so that a mixture by weight would give unacceptable results). Let deposit for 15 minutes, stir again and filter if necessary to eliminate possible lumps.
Apply within 6 hours maximum.
We strongly recommend using a low speed electric mixer in every stirring operation in order to obtain the best adhesion and protection results.

THINNING

Not recommended. The addition of a thinner might loosen the resin/flakes molecular matrix, thus lowering the anti corrosion properties of the system.

DRYING TIME 

Primer 4220:  touch dry after 3 hours – over coating   after 12 hours
Finish coat 4908                 touch dry after 4 hours – over coating   after 12 hours
Note: It is not recommended to dry the paint in the oven, as a too fast evaporation of the solvents would not allow the flakes to form a solid surface.

SERVICE

The complete system can be put into light service after 36 hours. Complete curing with achievement of maximum hardness and protection occurs in 2 weeks.

COVERAGE

Theoretical coverage:
primer  4220:           9,30  sm/lt  at   75  µ  dry – 5,65  sm/lt at  125  µ  dry
finish coat  4908:     9,00  sm/lt  at   75  µ  dry – 6,70  sm/lt  at 100  µ  dry

Note: Practical coverage can be 10 – 25% lower than the theoretical one according to working conditions, surface shape and application method.

TEMPERATURE 

Maximum working temperature: 121° C

LIMITATIONS

Application temperature between 10 and 38° C for both working place and surface to coat.  Relative humidity less than 85%.
Temperature of the surface to coat at least 3° C over dew point (to calculate this value please refer to table A).

CAUTIONS 

Use breathing mask for spray applications.
Apply only in well ventilated areas.
Use hand protection gloves.
Do not swallow, do not breathe aerosols.
A detailed safety data sheet is included in every parcel and is available upon request.

CHEMICAL RESISTANCE

Immersion service
Occasional contact
Frequent contact
Caster oil WineOleic acid
Sunflower oilButyl acetateFruit juice
Linseed oilEthyl acetate Xilene
Peanut oilAcetoneCaustic soda 20%
Fish oilPhosphoric acid 50%Aqueous alcohol 40%
Distilled waterNitric acid 10%Alum.sulphate20%
Fresh waterSulphuric acid 20%Vaseline
Sea waterStyreneAmmonia
TurpentineTrichloroethyleneBenzene
DetergentsMethyl Isobutyl KetoneToluene
GasolineEthyl alcohol
Diesel fuelMethyl alcohol
Acrylic emulsionButyl alcohol
Ethylene glycol
Glycerine
Glucose
Hexane
Kerosene
VM&P Naphtha
Brine

 

Technical Data


STEEL IT
4908
STEEL IT
PRIMER 4220
 CPS viscosity:
800
550
 Colour:
Metallic (*)
Red
 Sheen:
 Low gloss
n.a.
 Total solid: by weight
78%
84%
 Total solid: by volume
68%
72%
 Pot life:
6 hours
 6 hours
 Shelf life:
(not mixed components)
 1 year
 1 year
 V.O.C.: gr/litre
 237
257
 Weight per gallon: kilos
 9,6
10,5

(*) See colour chart | V.O.C. = volatile organic compounds


 

 

PACKING

Product

Code

Unit Litres

Units per Box

Weight per box Kilos

STEEL IT
4908

ST.4908 Q

0,945 A
0,945 B

3 Kits

8,6

ST.4908 G

3,780 A
3,780 B

  2 Kits

22

PRIMER
4220

ST.4220 Q

0,945 A
0,945 B

3 Kits

11

ST.4220 G

3,780 A
3,780 B

2 Kits

28

Note: every unit includes one component A and one component B