# 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 (T_{NR}) 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 *T _{NR}*.

It follows that SADT and/or SAPT are determined from equation 3.