SADT / SAPT Testing Process
Kinetica, Inc. specializes in Self-Accelerating Decomposition Temperature (SADT) and Self-Accelerating Polymerization Temperature (SAPT) testing.
Testing involves selected UN protocols (H.1 and H.4) described in the UN Recommendations on the Transport of Dangerous Goods, Model Regulations (Orange Source Book) Volumes 1 & 2 and tests developed from calorimetric data measured with differential scanning calorimetry (DSC) and adiabatic calorimetry (AdC).
UN sanctioned tests and applicability consist of the following:
H.1 — United States SADT, package transport
H.2 — Adiabatic storage test (AST), packages, IBCs and tanks
H.3 — Isothermal storage test (IST), packages, IBCs and tanks packages, IBCs and tanks
H.4 — Heat accumulation storage test, packages, IBCs and small tanks
The H.1 test is applicable to packages with a maximum volume of 225 liters; H.4 is a Dewar flask test that correlates with 25 kg packages.
In-house testing based on DSC and AdC methods involve computation of the temperature of no return (TNR) and the SADT and SAPT from the criticality parameters for convective and conductive heat transfer given in equations 1-2,
where ΔΗ is reaction enthalpy, r is radius, ρ is density, C is concentration, A and E are Arrhenius parameters, U is the surface heat-transfer coefficient, S is surface area, e is the base of the natural logarithm, T is temperature, λ is thermal conductivity, R is the ideal gas constant, and δ is the shape factor. Thermokinetic parameters may be evaluated from appropriate calorimetric data and employed in equations 1 and 2 to determine the TNR.
It follows that SADT and/or SAPT are determined from equation 3.