PN-C-04914
Laboratory
TESTING OF THE
IMPACT OF WOOD PROTECTION MEASURES ON FLAMMABILITY OF WOOD USING
CALORIMETER CONICAL METHODS IN ACCORDANCE WITH PN-C-04914 AND ISO
5660-1
Principle
of the method.
A comparative method was used. A sample of the wood under test in a
horizontal position shall be subjected, in the presence of an
external spark igniter
initiating combustion, to the operation of a heat flux of 30kW/m2
produced by a tapered electric radiator and measuring the changes in
the concentration of oxygen in the gases Combustion. Based on changes
in oxygen concentration, the intensity of heat is determined.
Stand
for testing effect on flammability of wood after treatment wood by
wood preservatives
Tests shall be
carried out for samples of wood protected and unsecured. The value of the
impact of the wood protection measure on its flammability is the
percentage change in measured parameters.
The following
measured parameters are compared:
- ignition time, s,
- maximum heat transfer rate, kW/m2,
- average heat transfer rate in 180s after ignition, kW/m2,
- average rate of loss in weight of wood sample, g/m2×s
It is assumed that
the wood protection product does not affect flammability when it
prolongs the ignition time by at least 50% and reduces the remaining
parameters by at least 120%.
Test
samples. For testing a representative
sample of the wood protection product shall be taken to be protected
by pine wood. The tests are carried out on the whites of common pine
with dimensions 100x100x10mm.
The number of
samples tested depends on the physic-chemical properties of the wood
protection product, the concentration and the method of application.
For each concentration of the wood protection product and any method
of application, prepare:
- six samples for measures used in the form of aqueous saline solutions,
- twelve samples for solvent and oily agents,
- six samples of unprotected wood.
Application
of the test method – wood and chemical industry