(1.)low specific gravity, good elastics, non-permeability , non-air-leakage, low burning point, and resistance against corrossion of microbes and chemical solvents.

 

(2.)Wine -purpose cork stoppers are generally classified under three categories:

2.1 polymer cork stoppers made cork powders processed with pressure-polymerization moulds, 2.2 plus-one paster cork stoppers with polymeric material between the two natural cork pieces.

2.3 natural cork stoppers usually madefrom high-grade and adequate cork powders pressure-polymerized into material mould with a certain density.

 

Agglomerated cork sticks test parameters:

Tests                                        sample       Average        Max.      Min.
Moisture(%)                               50             8.4               9.0        8.0
Diameter(mm)                            50             25.1             25.6      24.6
Length(mm)                               50             630.7           635.0    630.0
Apparent Density(kg/m3)           50             264              283       252