BERKSHIRE TESTS bond paper
properties identified by contamination control professionals as most critical.
The test methods we employ are vital to product development and quality
assurance. All test methods are based on Recommended Practices and Standards
from the Institute of Environmental Sciences and Technology (IEST), the International
Organisation for Standardisation (ISO) and the Technical Association of the
Pulp and Paper Industry (TAPPI).
The following are
brief descriptions of Berkshire’s Bond Paper Tests:
Weight and Thickness
Basis Weight — A sample of
bond paper, of known size, is weighed and results expressed as grams per square
meter (g/m2). [TAPPI T-410]
Caliper — The thickness
of a single sheet of bond paper is measured using a digital micrometer. Results for thickness are expressed in
microns (µm). [TAPPI T-411]
Fibers — A sample of
bond paper is “sluiced” in a tray of water for one minute. The fibers released
into the water are filtered onto a membrane and counted microscopically. The
results are expressed as fibers ≥ 100µm per square centimeter of bond paper.
Particle Generation — A sample of bond
paper is “sluiced” in a tray of water for one minute. A liquid-borne particle
counter tallies the particles released into the water. By dividing the total
number of particles released by the area of the bond paper sample, the results
are expressed as particles ≥ 0.5µm per square centimeter of bond paper.
Non-Volatile Residue — Berkshire
generates non-volatile residue data using both deionized water and 2-Propanol.
Results are expressed in grams of extractables per square meter of bond paper.
Metallic Ions — Ions are extracted in deionized water
and quantitatively analyzed by Ion Chromatography. Results are stated in parts
per million (ppm). [IEST-RP.CC020.2]
Tear — The force
required to tear bond paper is tested across the width and length of the sample. Results are expressed in millinewtons (mN).
Burst — The pressure required to burst bond paper is tested with results expressed in kilopascals (kPa). [ISO 2758:2014]