"insensitive to variations" is a correct and usable phrase in written English.
It can be used to describe something that is not affected or influenced by differences, changes, or variations. For example, "The new system is insensitive to variations in temperature, making it suitable for use in all climates."
The entropy production was insensitive to variations in the feed temperature.
The model is quite insensitive to variations of most of the properties studied.
Robust design suggested in the present study has been developed to obtain an optimum value insensitive to variations on design variables within a feasible region.
The edge-flame speed and OH overshoot at the leading edge of the edge flame are relatively insensitive to variations in the initial conditions of the ignition.
The relative contributions of thermal and prompt mechanisms to total NOx are generally insensitive to variations in as, but show strong sensitivity to variations in φ.
The width of the temperature fronts connecting the high- and low-temperature zones was rather insensitive to variations in the thickness and diameter of the ring.
Conversely, rubisco cleanability from the neutral hydrophilic surface was surprisingly insensitive to variation in bulk enzyme concentration.
Therefore, our data add evidence showing that embryonic development in reptiles with pliable-shelled eggs is relatively insensitive to variation in hydric environments during incubation.
The small fluctuation in its drag coefficients means that the performance of the robust airfoil is insensitive to variation of Mach number.
Landsat data provide extensive coverage of generalized forest structural classes in the horizontal plane but are relatively insensitive to variation in forest canopy height.
A hybrid genetic/non-linear-programming algorithm is used with a multi-objective formulation to locate a design that is optimal under the primary design criteria, but is simultaneously insensitive to variation.
