1 Foreground code is running, interrupts are enabled. 2  Interrupt event sends an interrupt request to the CPU. 3  After completing the current instruction(s), the CPU begins the interrupt response. 4  automatically saves current program counter. 5  automatically saves some status (depending on CPU).
Impregnator or penetrating sealers are designed to penetrate below the. surface of the stone and either deposit solid particles in the pores of the stone, or coat the individual minerals below the surface. Penetrating. sealers work by restricting water, oil and dirt from entering the stone or tile.
NP-1 and NP-2 are the industries most popular high-performance exterior grade sealants. These are moisture-curing polyurethanes. NP1 and NP1 are designed for sealing / caulking all types of active exterior construction joints. NP-1 requires no mixing and bonds to most construction materials without a primer, including concrete, masonry, wood and most metals. NP-2 is a color tintable 3-part sealant which accommodates up to 2 joints with +/- 50% joint movement.