Khemix 400 low solvent level meets VOC requirements, reduces the changes for film pinholing and solvent entrapment at the substrate-coating interface, often a major cause of coating failure with conventional epoxies and lower solids systems.
Khemix 400 is available in a variety of colors, including aluminum and therefore does not require a topcoat. For extended weather ability or special uses, a topcoat may be desired.
Khemix 400 is used in those areas where blasting is impractical or impossible. As a maintenance coating, Khemix 400 protects steel structures in industrial facilities, bridges, tank exteriors, marine weathering, offshore, oil tanks, piping, roofs, water towers and other exposures. Khemix 400 has good chemical resistance to splash/spillage, fumes and immersion in neutral, fresh and salt water.
• Low VOC
• High Performance general maintenance coating for new or old steel
• Cures through wide temperature range
• Self-priming topcoat over most existing coatings
• Can be overcoated with wide range of topcoats
• Compatible with prepared damp surfaces
• Compatible with adherent rust remaining on prepared surfaces
• 5 mils or more in single coat
• Resists high humidity and moisture
• Can be applied to substrates with temperatures up to 250 ºF
Typical Properties
Physical
Abrasion resistance (ASTM D 4060)
1 kg load/1000 cycle weight loss
CS-17 wheel 102 mg
Impact resistance (ASTM D2794)
Direct 24 in lb
Reverse 6 in. lb
Moisture vapor transmission (ASTM D1653)
6.28g/m²/24hrs.
Adhesion (ASTM D4541) 900 psi
Performance
Salt spray (ASTM B117) 3000 hours
Face blistering None
Humidity(ASTM D2247) 750 hours
Face corrosion, blistering None
Immersion (NACE Tm-01-69) fresh water 1 year
Blistering None
Finish Semigloss
Color Standard, Rapid Response, custom colors and aluminum
Components 2
Curing mechanism Solvent release and chemical reaction between components
Volume solids(ASTM D2697 modified)
K400 83% ± 3%
Dry Film thickness (per coat) 44-8 mils (100-200 microns)
Coats 1 or 2
Theoretical coverage ft ² /gal m ² /L
1 mil (25 microns)
K400 1331 32.6
5 mils(125 microns)
K400 266 6.5
VOC lb/gal g/L
400 mixed* 1.5 180
mixed/thinned (1/2 pt/gal)** 1.8 220
Temperature resistances, * wet dry
400 ° F ° C ° F ° C
continuous 100 38 200 93
intermittent 100 38 350 117
Flash point(SETA) ° F ° C
K400 Resin 131 55
K 400 Cure 85 29
Surface Preparation
Coating performance is in general, proportional to the degree of surface preparation. Abrasive blasting is usually the most effective and economical method. When this is impossible or impratical, Khemix 400 can be applied over mechanically cleaned surfaces. All surfaces must be clean, dry and free of all contaminants, including salt deposits.
Khemix 400 may be used over most types of properly prepared and tightly adhering coatings. A test patch is recommended for use over tightly adhering coatings. A test patch is recommended for use over existing coatings.
Steel – Remove all loose rust, dirt, moisture, grease or other contaminants from surfaces. Power-tool clean SSPC-SP3 or hand-tool clean SSPC-SP2. For more Severe environments, dry abrasive blast SSPC-SP7. Water blasting is also acceptable. For immersion service-dry abrasive blast SSPC-SP10. For high-heat service on uninsulated substrates, abrasive blast per SSPC-SP6. For insulated substrates, abrasive blast per SSPC-SP10. In both cases, a 2-3 mil profile must be obtained.
Aluminum - Remove oil, grease or soap film with neutral detergent or emulsion cleaner or blast lightly with fine abrasive.
Galvanizing - Remove oil or soap film with neutral detergent or emulsion cleaner, then use zinc treatment such as Khemix 163 or equipvalent or blast lightly with fine abrasive.
Concrete-Acid etching (ASTM D4260) or abrasive blast (ASTM D4259) new concrete cured a minimum of 14 days.
Application data
Applied over Steel, concrete, aluminum, galvanizing
Surface preparation
Steel SSPC-SP2,3,6,7,10,11, or 12
Concrete ASTM D4259 or 4260
Aluminum Alodine, Alumiprep or light abrasive blast
Galvanizing Galvaprep or light abrasive blast
Method Airless or conventional spray. Brush or roller may require additional coats
Mixing ratio (by volume) 1 part resin to 1 part cure
Pot Life (hours) ° F/ ° C
861 Accelerator Amerlock/mixed 5 gal 90/32 70/21 50/10 32/0
None 400 1 ½ 2 ½ 4 7
1 pt 400 ½ 1 1 ½ 2
P ot Life is the period of time after mixing that a five-gallon unit of material is sprayable when thinned as recommended. Mixture may appear fluid beyond this time, but spraying and film build characteristics may be impaired
Environmental conditions
Product Air or surface Temperature
K400 40 ° to 250 ° F (4 ° to 121 ° C)
Surface temperatures must be at least 5 ° F(3 ° C) above dew point to prevent condensation. At freezing temperatures, surfaces must be free of ice.
Khemix 400 may be applied to surfaces as hot as 250 ° (121 ° C). When applying Khemix 400 to surfaces between 122 ° F and 250 ° F, thin ½ pint per gallon with thinner . Multiple passes may be required to achieve film build and to avoid solvent blistering.
The following is a guide; suitable equipment from other manufacturer may be used. Changes in pressure, hose and tip size may be needed for proper spray characteristics.
Airless Spray- Standard equipment with 30:1 pump ratio or larger, with a 0.017- to 0.021 –inchi fluid tip
Conventional spray – Industrial equipment, such as De Vilbiss MBC or JGA or Binks 18 or 62 spray gun. A moisture and oil trap in the main air supply line, a pressure material pot with mechanical agitator and separate regulators of air and fluid pressure are recommended.
Power mixer - Jiffy Mixer powered by an air or explosion-proof electric motor
Brush or roller - Additional coats may be required to attain proper thickness.
Application Procedure
• Flush all equipment with thinner before use
• Stir resin and cure using an explosion-proof power mixer to disperse pigments
• Add cure to resin. Mix thoroughly until uniformly blended to a workable consistency.
• Do not mix more material than can be used within the expected pot life
• For optimum application, material should be from 50° to 90°F (10° to 32°C). Above 122°F (50°C), sagging may occur.
• Use only Khemix recommended thinners. For portable water applications, see current NSF listing at www.nsf.org for approved thinners and thinning restrictions. For other applications, a small amount of thinner greatly reduces viscosity; excessive thinning will cause running or sagging. Thin cautiously as follows:
Khemix Thinner 400
Airless - up to 1/4 pt/gal
Conventional - up to 1/2 pt/gal
Below 50°F additional thinning may be needed and multiple coats required to achieve specified thickness.
Above 122°F, up to 250°F surface temperatures, use Khemix thinner sparingly to promote flow and leveling. Excessive thinning will cause running or sagging.
• To minimize orange peel appearance, adjust conventional spray equipment to obtain adequate atomization at lowest air pressure
• Apply a wet coat in even, parallel passes with 50 percent overlap to avoid holidays, bare areas and pinholes. If required, cross spray at right angles.
• When applying K400 directly over inorganic zincs or zinc rich primers, a mist coat/full coat technique may be required to minimize bubbling.
• Ventilate confined areas with clean air between coats and while curing the final coat. Prevent moisture condensation on the surface between coats
• Repair damaged areas by brush or spray
• Clean equipment with thinner immediately after use.
Safety Precautions
Read each component's material safety data sheet before use. Mixed material has hazards of each component. Safety precautions must be strictly followed during storage, handling and use.
CAUTION - Improper use and handling of this product can be hazardous to health and cause fire or explosion.
Do not use this product without first taking all appropriate safety measures to prevent property damage and injuries. These measures may include, without limitation:implementation of proper ventilation, use of proper lamps, wearing of proper protective clothing and masks, tenting and proper separation of application areas. Consult your supervisor. Proper ventilation and protective measures must be provided during application and drying to keep solvent vapor concentrations within safe limits and to protect against toxic hazards. Necessary safety equipment must be used and ventilation requirements carefully observed, especially in confined or enclosed spaces, such as tank interiors and buildings
This product is to be used by those knowledgeable about proper application methods. Khemix makes no recommendation about the types of safety measures that may need to be adopted because these depend on application and space, of which Khemix is unaware and over which it has no control.
If you do not fully understand the warnings and instructions or if you cannot strictly comply with them, do not use the product.
Note : Consult code of Federal Regulations Title 29, Labor, parts 1910 and 1915 concerning occupational safety and health standards and regulations, as well as any other applicable federal, state and local regulations on safe practices in coating operations.
This product is for industrial use only. Not for residential use.
Limitation of Liability
Khemix liability on any claim of and kind, including claims based upon negligence or strict liability, for any loss or damage arising out of, connected with, or resulting from the use of the products, shall in no case exceed the purchase price allocable to the products or part thereof which give rise to the claim. In no event shall Khemix be liable for consequential or incidental damages
Due to Khemix's policy of continuous product improvement, the information contained in this Product Data/Application Instructions sheet is subject to change without notice. It is the Buyer's responsibility to check that this issue is current prior to using the product