DENSITY
Mass per unit volume of a material at a specified temperature.
Standards
- ASTM D 4138, D 1475, D 2805.
- BS 3900 A 19.
- DIN 53217.
- ISO 2811
Significance:
If density is not within spec, then there is a good chance that there could be some error in charging of the batch.an act as a check on solids of paint
Non Volatile Matter
The volume of the dried coating divided by the volume of liquid coating, multiplied by 100, provides the volume percent non-volatile matter inthe total liquid coating.
Standards
- ASTM D 2697
Significance:
- Indicates the weight solids in paint.
- Higher solids means higher coverage
Volume Solids
Defined as the total volume of non-volatile solids present in one litre of paint.
Standards
- ASTM D 2697
Significance:
- A measure of spreading capacity of paint
- Higher volume solids product will give higher coverage at a given DFT.
- Higher volume solids products are being preferred due to VOC regulations in developed countries.
Viscosity by Ford Cup
Viscosity is the force per unit area that resists the flow of two parallel fluid layers.
Standards
- ASTM D 1200
Significance:
- Flow & levelling properties.
- Anti-sag properties.
Viscometer
Brookfield LV
VISCOSITY
Stormer viscometers-(ASTM D 562)
- Paddle is immersed in the paint and load in weight applied throught string
- Load (in krebs) required to produce 200 revolutions in 60 seconds is recorded
- Stroboscopic timer will indicate the motionless lines when 200 rmp is achieved
Blast Clean Test
The pottassuim ferricyanide test for water-soluble iron salt that from at the bottom of rust pits after blast-cleaning.
International Standard BS 5493
- Simply spray a film of deionised water on an area of the blast-cleaned steel.held the test paper against the surface for about 10 seconds
- Any soluble iron salts present are drawn out of the rust pits by capillary action and react with the potassium ferricyanide to form blue spots
- The presence of blue spots on the test paper indicates that the surface should be re-blasted.
Bresle Test
International Standards: ISO 8502-6 and ISO 8502-9 Contaminating the surface prior to the coating application due to salts such as chlorides and sulphates
Standards
- Take 10 ml of distiled water into the beacker
- Determined the condutivity
- Apply the bresle patch on the test sufface
- Inject and extract back the 2.5ml test water upto 10 cycles
- Transfer test water back into the beacker
- Again cheack condutivity
- Multiply reading by 0.4 = quantity of salt in g/cm = ppm
Wet Film Thickness
Dete rmined as being between the clearance of the deepest notch face wetted and the clearance of the next deeper notch face not wetted by the film.
Standards
- ASTM D 4414-A
DFT = WFT x % Vol.Solid
The wet-film thickness is determind as being between the clearance of the deepest notch face wetted and the clearance of the next deeper notch face not wetted by the film.
Flash Point
Sag-Index-Applicator
