Specification of CHESTERTON TYPE 477-1T
477-1T Gland Packing Non Asbestos
Carbon/PTFE GLAND PACKING NON ASBESTOS
Chesterton 477-1T is a tough, yet pliable, continuous filament carbon yarn packing
impregnated throughout with PTFE to provide a non-contaminating, non-staining
carbon yarn packing. 477-1T was developed for tough applications in the pulp and
paper industry. It is specially designed to be used in high pressure feeders, presteaming
vessels and applications that are moving abrasive slurries. The
combination of carbon yarn and PTFE dispersions increases the 477-1T chemical
resistant properties when up against strong caustic and acid mediums.
477-1T is also an excellent bottom anti-extrusion end ring in combination with
1400R in rotating equipment. This combination is ideal when attempting to reduce
or eliminate flush water from a stuffing box.
Technical Data
Temperature Limit:
260°C (500°F)
Pressure Limit:
14 bar g (200 psig)
Shaft Speed:
10 m/s (2000 fpm)
15 m/s (3000 fpm) when used as
a bottom anti-extrusion ring
with 1400R
Chemical Resistance:
pH 0 to 14 except with strong
oxidizers
Applications:
Pulp and paper, pre-steaming
vessels, high and low pressure
feeders, grinding stone,
hydropulpers, agitators
and mixers
