Resistance index

Kirchhoflf sum index = fllD index resistance matrix... 

Material Formula Density gem Flam- mability Limiting oxygen index % Optical transmission % Radia- tion resis- tance Refrac- tive index Resistance to Ultra violet Water absorption % Water absorption equilibrium % Water absorption - over 24 hours %... 

Glass Expansion, Conduethrity, Index Resistance Specimen 2000 psi. 

Density, g/cm CTE, 0 to 300°C Strain point, °C Annealing point, °C Softening point, °C Working point, °C Young s modulus, GPa Poisson s ratio Refractive index Resistivity at 350°C log(Q cm) References... 

Antimony Oxide. The effect of antimony trioxide on the oxygen index of flexible poly(vinyl chloride) containing from 20 to 50 parts of plasticizer is shown in Figure 2. The flame resistance as measured by the oxygen index increases with the addition of antimony oxide until the oxygen index appears to reach a maximum at about 8 parts of Sb202. Further addition of antimony oxide does not have any increased beneficial effect. 

Molybdenum Oxide. Molybdenum compounds incorporated into flexible PVC not only increase flame resistance, but also decrease smoke evolution. In Table 10 the effect of molybdenum oxide on the oxygen index of a flexible PVC containing 50 parts of a plasticizer is compared with antimony oxide. Antimony oxide is the superior synergist for flame retardancy but has Httle or no effect on smoke evolution. However, combinations of molybdenum oxide and antimony oxide may be used to reduce the total inorganic flame-retardant additive package, and obtain improved flame resistance and reduced smoke. 

G1 as s CO de b Thei mal stress resist ance °c Strain, °C Anne alia °C Soften in °c Workin °C Knoo P hardn ess, HKio 0 Den sity, g/c 3 m Youn g s mod ulus, GPa Poiss on s ratio 25° C 25 0° C 350 °C Powe r factor, % Diele ctric const ant Loss factor, % Refrac tive index... 

Elame-spread and smoke-density values, and the less often reported fuel-contributed semiquantitive results of the ASTM E84 test and the limited oxygen index (LOI) laboratory test, are more often used to compare fire performance of ceUular plastics. AH building codes requite that ceUular plastics be protected by inner or outer sheathings or be housed in systems aH with a specified minimum total fire resistance. Absolute incombustibHity cannot be attained in practice and often is not requited. The system approach to protecting the more combustible materials affords adequate safety in the buildings by aHowing the occupant sufficient time to evacuate before combustion of the protected ceUular plastic. 

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