chemaline 250

Excellent chemical resistance

Excellent adhesion

Equally efficient on concrete and metal

Tough abrasion resistant film

Excellent immersion properties

Long maintenance – free life

Easy to apply

Appearance – As per RAL Colour Card

Volume Solids – 100%

Specific Weight – 1.3 – 1.5 kg/L

Mixing Ratio – 3 : 2

Flash Point – >650C

Drying Time @ 250C:
Pot Life Pot Life 15–20 min.
Touch Dry 6 hrs.
Hard Dry 24 hrs.
Recoat 8–10 hrs.
Fully Cured 7 days

Coverage – 5 m2/L

DFT – 200 microns

WFT – 200 microns

Shelf Life – 12 months

Test Result as per ASTM D 1308:

Water, de-ionized – Excellent

Sea Water – Excellent

Sodium Chloride, 20% – Very Good

Crude Oil – Excellent

Flash point – >650C

Hydrochloric Acid, 10% – Very Good

Nitric Acid, 10% – Excellent

Acetic Acid, 10% – Good

Ethanol, 50% – Slightly soft

Xylene – Good

Citric Acid, 30% – Excellent

Steel:

Remove oil grease from surface to be coated with Thinner or MAS degreaser in accordance with SSPC –SP 1.
For mild environments Hand Tool or Power Tool Clean in accordance with SSPC – SP 11 to produce rust-scale free surface.
For more severe environments, abrasive blast to a Commercial Finish in accordance with SSPC –SP 6 and obtain a 1 ½ – 3 mil (40 – 75 micron) blast profile.
For immersion service, abrasive blast to a Near White Metal Finish in accordance with SSPC – SP 10 and obtain a 1 ½ – 3 mil (40 – 75 micron) blast profile.

Concrete:
Concrete and masonry surfaces should be clean, dry and free from loose debris and laitance. Apply 1 coat of multi etch solution, let it dry prior to the application of CHEMALINE #250.

The content of each material should be thoroughly stirred particularly the base resin to disperse any possible settlement. Materials are supplied pre-weighed and the entire hardener should be mixed into the base material thoroughly until homogenous solution and uniform colour consistency is obtained. Mechanical mixing using power drill with suitable flat paddle is preferred for 3-5 minutes. CHEMALINE #250 can be applied by brush or roller. The first coat should be firmly applied and scrubbed well into the surface ensuring a continues and uniform thickness.

Thinning:
For spray application may be thinned up to 13 oz./gal. with Thinner #135. For hot and windy conditions, or for brush and roller application, may be thinned up to 16 oz./gal, with Thinner #135. Use of thinners other than those supplied by MAS Paint may adversely affect product performance and void product warranty, whether express or implied.

Application Conditions:
Do not apply or cure the material when the surface temperature is less than 30C above the dew point. Special thinning and application techniques may be required above or below normal conditions.

Spray:
This is medium solids coatings and may require slight adjustments in spray techniques. Wet films thicknesses are easily and quickly achieved. The following spray equipment has been found suitable and is available from manufacturers such as Binks, De Vilbiss and Graco.

Conventional:
Pressure pot equipped with dual regulators, 3/8” I.D. minimum materials hose, .070” I.D. fluid tip and appropriate air cap.

Airless:
GPM Output – 3.0 (min.)
Material Hose – 3/8” I.D. (min.)
Tip Size – 0.017 – 0.021
Output (psi) – 2100 – 2300
Filter Size – 60 mesh.

Brush or Roller:
Use a medium bristle brush, or good quality short nap roller. Avoid excessive re-brushing and re-rolling. Two to three coats may be required to obtain desired appearance, hiding and recommended DFT, for best results, tie – in within 10 minutes at 240C.

Drying Time:
These times are based on 100 microns dry film thickness. Higher film thicknesses, insufficient ventilation or cooler temperatures will require longer cure times and could result in solvent entrapment and premature failure. Excessive humidity or condensation on the surface during curing can interfere with the cure, can cause discoloration and may result in a surface haze or blush. Any haze or blush must be removed by water washing before recoating. During high humidity conditions, it is recommended that the application be done while temperatures are increasing. For best results over “damp” surfaces, apply by brush or roller.

Repairing and Over-coating:
Areas, which have been previously coated with CHEMALINE #250 and subsequently damaged, can be readily over coated. The existing coated surface must be well abraded, using sand blasting or wet applied abrasive paper, to ensure a good bond. Over-coating may then be carried out as for new work.

Note:
Although CHEMALINE #250 may be applied at temperatures down to 100C, the curing time increases significantly in the lower ranges. For cold weather working, it is recommended that materials are stored in a heated building and only removed immediately before use. Accelerated heating methods must not be used.