CORROGLASS
Corroglass 202
Product reference: 1/01
Product title: Corroglass 202
Valid from: 14th August 1997
Last reviewed: 31 May 2019
Type: A high build glass flake coating based on pre-accelerated Bisphenol `A` Polyester Resin with a large high flake loading, cured by addition of Organic Peroxide.
Suggested use
As a build coat for Corroglass 200 series specifications, 202 can be used in many applications where good corrosion, abrasion and chemical resistance are required. This general–purpose material is ideal for protection of metal and masonry substrates in arduous conditions. 202 has high chemical and acid resistance and is suitable for tank lining, pump casing, valve repair and protection. When fully cured it is readily machined, it can also be used to give added resistance to GRP fabrications or cast to form components.
Limitations
Not suitable for demineralized water. Resistance to polar solvents is poor and alkaline resistance at temperatures above 140°F (60°C) is limited.
Health & safety
Before handling or using this product, the safety data sheetshould be read, and all precautions observed.
Surface preparation
The surface to be coated should be free from grease etc. Metal should be grit blasted to SSPC-SP10 (ISO Standard 8501-1 Sa 2½) or equivalent, with a surface profile of at least 3 mils (75 microns), 4-5 mils (100-125 microns) being the ideal key. All blast residues should be removed by sweeping clean and vacuuming where necessary. Coating of the substrate should then take place as soon as possible. Although 202 can be applied directlyto the substrate, its wet-out properties are poor, and to reduce application time of the first coat, it is advisable to use Corroglass 232 as a primer under this material. For full Surface Preparation details see relevant Surface Preparation Specification sheets.
Chemical resistance
Refer to the chemical resistance list. Affected bysome
highly polar solvents and some solutions having a high pH
above 122°F (50°C).
Surface preparation
Metals: Grit blast to SSPC-SP10 (ISO standard 8501-1
Sa 2½ near 3). For full details refer to Corrocoat Surface
Preparation SP1.
Concrete: refer to Corrocoat SP5.
Coating of the substrate should then take place as soon
as possible. Although 602 can be applied directly to the
substrate, its wet-out properties are poor and in order to
reduce application time of the first coat, it is advisable to use
Corroglass 632 as a primer under thismaterial.
Mixing ratio
Corroglass 202 can be catalysed within the ratios of 100:1 parts Base to Catalyst by weight to 100:2 parts Base to Catalyst by weight. The ratio should always be within these limits, 2% addition of catalyst being the norm with a reduction being made for high ambient temperatures.
Mixing
Weigh out only the proportion of material that can be used within the pot life and place into a suitable mixing container. Measure the correct proportion of catalyst for the amount of base and carefully add this to the base using a suitable clean implement. Mix thoroughly then add dye where necessary and mix to an even color. After mixing in the original container it is advisable to remove the contents onto a flat clean surface or shallow receptacle and re-mix.
Pot life
40 to 50 minutes at 68°F (20°C). Pot life will be shorter at higher temperatures and longer at lower temperatures. Where temperatures are below 50°F (10°C) the use of catalyst P4 will reduce pot life and cure time. Where higher temperatures are encountered, refrigerate materialbefore use or seek the advice of Corrocoat USA foravailability of material with longer pot life.
Practical spreading rate
Regular surfaces e.g. new steel – 25 sf per gallon at 40 mils dft (1.8 Kg/m²) minimum. Irregular surfaces e.g. badly pitted steel – 15 sf per gallon at 40 mils dft(2.8 Kg/m²). Note: thi s information is given in good faith but may increase dependent upon environmental conditions, the geometry and nature of work undertaken and the skill and care of application. Corrocoat USA accepts no responsibility for any deviation from these values.
Density
Apparent 1.05 G/cm3. Actual 1.13 G/cm3 for Base.
Flash point
88°F (31ºC)
Catalyst type
Methyl Ethyl Ketone Peroxide Corrocoat Type P2 (for Ambient temperatures of 50°F (10°C) or above) or Catalyst P4 (for ambient temperatures below 50°F (10°C).
Mixing ratio
100:1 to 100:2 base to catalyst.
Hardness
40 barcol (approximate)
Tensile strength
3400 psi (23.4 N/mm²)
Cohesive strength
1720 psi (11.8 N/mm²)
Elongation
0.3%
Application equipment
Brush, Trowel or Float.
Application
This viscous material is preferably applied over the top of a recommended primer (either Corroglass 232 or PPA). 202 can be applied at thicknesses up to 3 mm in a single film and where necessary can be built up using multiple coats to any required thickness. However, consideration should be given to any mechanical properties required and reinforcement where necessary. Because of exotherm and shrinkage this product should not be applied in single applications at thicknesses more than 6 mm.After applying and levelling this material, the surface should be lightly brushed or trowelled with Styrene, catalysed with P2 at 2% level, to close any voids and assist with orientation of the flake structure. However, care must be taken to avoid the excessive use of Styrene, which may degrade the surface layer or cause problems with inter-coat adhesion. Care must also be taken not to over work the product, which will rapidly increase in viscosity. When applying, each subsequent coat of material should be of a different color to the previous one to ensure full and even coverage. Only the recommended dye for the product should be used and dye must be used sparingly so that only the necessary amount is used to give good differentiation from the previous application. Dyes can affectchemical and corrosion resistance in some environmentsand the advice of Corrocoat USA should be sought in situations where the material will work close to either its chemical resistance or temperature limit. In some environments, dyes are not color stable and a change in color may take place in service, which is not detrimental to coating performance
Thinners
This material can be thinned by the addition of not more than 5 parts of Styrene Monomer to 100 parts base before catalyzation. Additionally, 202 may be mixed with 232 without detriment to performance while obtaining a less viscous material. NO OTHER DILUTENT OR THINNER SHOULD BE USED. THE USE OF ACETONE OR SIMILAR THINNERS IN CORROGLASS WILL SEVERELY AFFECT PRODUCT PERFORMANCE.
Packaging
1 Gallon and 5 Gallon Kits
Storage life
12 months stored at temperatures below 68°F (20°C) and away from radiating heat sources or direct sunlight(see Shelf Life Information Sheet).
Color availability
Unpigmented (Translucent Brown) or Pigmented (White). Dyes can be used to effect color change.
Recommended DFT
1 to 3 mm in two coats or as advised, may be built up to any desired thickness for repair via multiple coats.
Theoretical spreading rate
32 sf per gallon at 40 mils dft (1.25 kg/m²)
Volume solids
This material contains volatile liquid convertible to solids. Volume solids obtained will vary dependent upon polymerization conditions. Nominally greater than 99% of the contents are convertible to solid.
Moisture vapor transmission rate
Approximately 1.095 X 10–² g/hr/m² (0.0007 Perm inches)
Thermal conductivity
0.389 W/m°k
Dielectric strength
16 To 25 x 10³ v/mm. Arc resistance 40 seconds minimum.
Temperature limits
Dependent upon environment. 194°F (90°C) immersed.320°F (160°C) non-immersed.
Overcoating
May take place as soon as previous coat has gelled sufficiently to resist movement of next application and while still tacky. Maximum overcoating without treatment 5 days. Shorter at ambient temperatures above 86°F (30°C).
Cleaning fluid
Acetone or Methyl Ethyl Ketone before gel. Trichloroethane after gel.
Machining
Material has similar machining characteristics to those of grey cast iron. Tool must be kept sharp. Run out will occur due to tool wear over relatively short distances, especially when facing from OD to center. Clean water may be used as a coating lubricant or dust suppressant.