BIS CERTIFICATION FOR READY MIXED PAINT, BRUSHING, WOOD PRIMER under IS 3536

BIS CERTIFICATION FOR READY MIXED PAINT, BRUSHING, WOOD PRIMER

Ready mixed paint is specially formulated to provide superior washability from skin and clothing. The paint has a smooth, creamy consistency and vivid opaque colours which are fully inter-mixable.

Wood Primer

A primer or undercoat is a preparatory coating put on materials before painting. Priming ensures better adhesion of paint to the surface, increases paint durability, and provides additional protection for the material being painted.

Bare wood is one of the more difficult substrates for topcoat adhesion. In the past, there was no substitute for a good slow-drying oil-based primer on bare wood. It takes a long time to dry, allows enough time to soak into the wood and adheres better than any other type of wood primer.

While an old fashioned oil primer is still best for this use, no one likes to wait 24 hours for the primer to dry before they can repaint it. That's why paint manufacturers have developed new, faster-drying technology in both oil-based and latex-based products that dry quickly while still helping your topcoat adhere properly.

If you don't mind waiting for a slow dry time and don't mind working with solvent cleaners, we always recommend an oil-based wood primer. If you don't want these hassles but have to paint bare wood, it's still worth using a good quality latex wood primer before applying the final coats.

Wood is very porous and will absorb the solvent in the paint and cause it to dry faster. This is undesirable because most paints undergo chemical reactions during the curing process (for example, latex and alkyd-based paints polymerize during curing), which is dependent on the slow evaporation of water or solvent. A coat of primer will prevent the underlying wood from prematurely absorbing the solvents in the final coat. Primer reduces the number of coats needed for good coverage and even color.

A thin layer of paint can still be permeable to water. Water can seep into the wood and cause warping, mold or dry rot. The primer improves the waterproofing of the surface. Primers are not used as part of a wood stain because they cover the grain of the wood. Primers differ from wood sealants in that sealants usually do not completely cover the grain of the wood.

Primers are often comparable in price to final paints, and the price is influenced by the quality of the ingredients. Primers for some specialty applications can be expensive.

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986  to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Ready Mixed Paint, Brushing, Wood Primer product has been specified in   IS 3536:2016 by Bureau of Indian Standards.

This standard prescribes requirements and methods of sampling and test for ready mixed paint, brushing, wood primer. This material is intended for use as a primer for wood.

REFERENCES

The standards listed in Annex A contain provisions which through reference in this text, constitute provisions of and necessary adjuncts to this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and partiesto agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated in Annex A.

Following are the Testing Parameters :

·       Drying Time

·       Surface dry

·       Hard dry

·       Consistency

·       Mass

·       Flash Point

·       Lead Restriction

·       Finish

·       Colour

·       Flexibility and Adhesion

·       Bend Test

·       Scratch Hardness

·       Composition

o   Volume Solids

·       Water Content Percent by Mass

·       Resistance to Water

·       Keeping Properties

Benefits of Wood Primer :

·       Seals the original wood to prevent paint from seeping into it.

·       Prevents seepage of knots, other natural defects and discoloration of bare wood.

·       Helps to hide joints or seams.

·       Ensures better adhesion, primers physically and chemically connect the paint to the surface.

·   &nbs