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Hence there is no stress build-up extended onto the film as it shrinks with temperature variation.
The film itself will not be harmed by temperatures between -50°C up to +50°C. Below the film will become stiff and further below (- 100°C) even brittle. Above 50°C the adhesive that fastens the film onto its mounting-ring may start to become soft - in case that temperature persists for longer than 24 hours.
Both sides of the film are metal coated and this coating cannot be cushined by any material that will stay in contact with the film – otherwise the optical properties may change and supenumerous images of the sun may be the cause.
AstroSolar Silver/Gold in comparizon does protect 100% in UV and 100% in IR even without any optical device added into the beam of light, but it does NOT have optical properties. Means it will notably deteriorate the wavefront when used in combination with optical decices providing a higher magnification than perceived by the human eye alone.
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