X is strong but has a very low density (1% of traditional
earth materials.) and hence
light weight. It is a recyclable material. The compression
behaviour of X is strain rate
dependent. Higher strain rates result in higher initial
modulus and higher
compression strength. It can also withstand unlimited
number of cycling loading
provided the repetitive loads are kept below 80% of the
compressive strength. The
internal structure of the material includes air-traps which
make it poor heat
conductor. X is non- biodegradable and chemically inert in
both soil and water. Most
acids and their water solutions do not attack it; however
strong oxidizing acids do.
Solvents which attack X include esters, ketones, ethers,
aromatic and aliphatic
hydrocarbons and their emulsions, among others. It does not
bacterial/fungal growth as well .It also has significant
acoustic properties and
effectively reduces the transmission of airborne sound. X
is combustible and should
not be exposed to open flame or other ignition sources.
Combustion products are
carbon monoxide, carbon dioxide, water and soot. Long-term
exposure to sunlight
causes yellowing and a slight embrittlement of the surface
due to ultraviolet light. X
is able to withstand the rigours of temperature cycling,
X is a solid having a white colour at room temperature. It
has a density about 2g/cc.
Although it has melting point near 325 degree Celsius, its
properties start degrading
above 260 degree Celsius. The coefficient of friction is
very low about 0.1. It has very
good dielectric properties especially at higher radio
frequencies. It has a very high
bulk resistivity. It is chemically inert. It is also
resistant to van der Waals force. It is
hydrophobic as well as lipophobic. Creep or ‘Cold Flow’ has
been observed in X.
I am working in a private software firm for past two years and now i want to switch to electronics company ... if they ask me
==>what I was doing for the past two years what would the appropriate answer to this ... please reply !
1. Is it required to lay two runs of GI wire along
with Armoured LT cable if it is laid between one big mains
(63Amps TPN SDF) to small main (32A TPN SDF) with proper
2. If the armoured cable with proper glanding is laid from
DB to CNC machine, is it required to run two runs of body
earthing to the Machine from DB?
3.If the armoured cable with proper glanding is laid
from Substation to Hangar, distance is approx. 100 mtrs, is
it required to do earthing at shop area though the primary
termination at substation is earthed through gland.