Pressure tight bonding at nonmetallic pipe joint surfaces.
Seal weld
Welding that is done to present a leak such as when a weld bead is laid where a pipe is screwed into a fitting.
Seal-off fitting
Fitting which prevents gas leakage, etc. from moving from one section of conduit to another.
Sealant
An elastomeric material used to fill and seal expansion and control joints. This material prevents the passage of moisture and allows the horizontal and lateral movement at the expansion and control joints.
Sealed combustion
Sealing of combustion chamber to prevent spillage of combustion products.
Sealed combustion heating system
A heating system that uses only outside air for combustion and vents combustion gases directly to the outdoors. These systems are less likely to backdraft and to negatively affect indoor air quality.
Sealer
Coating which is used on a surface to close off pores so that penetration of liquid is prevented. There are different types of sealer for wood, masonry, asphalt, concrete, etc.
Seam
A line, ridge, or groove formed from fitting, joining, or lapping two sections together.
Seam weld
Welding done along the seam of joining or overlapping pieces.
