Caulk in the context of Boiler

Lashed-lug boats are ancient boat-building techniques of the Austronesian peoples. It is characterized by the use of raised lugs (also called "cleats") on the inner face of hull planks. These lugs have holes drilled in them so that other hull components such as ribs, thwarts or other structural components can be tied to them with natural fiber ropes (hence "lashed"). This allows a structure to be put together without any metal fastenings. The planks are further stitched together edge-to-edge by sewing or using dowels ("treenails") unto a dugout keel and the solid carved wood pieces that form the caps for the prow and stern. Characteristically, the shell of the boat is created first, prior to being lashed unto ribs. The seams between planks are also sealed with absorbent tapa bark and fiber that expands when wet or caulked with resin-based preparations.

Lashed-lug construction has been used on a wide size range of vessels, from small craft, such as logboats that have had planks added to their sides to increase their freeboard, to large plank-built ships. It is found in traditional boats of Maritime Southeast Asia, Melanesia, Madagascar, Micronesia, and Polynesia. It forms part of the maritime technology used by Austronesian peoples in their spread throughout the islands of the Indo-Pacific starting at 3000 to 1500 BCE. The oldest recovered remains of ships of lashed-lug construction is the Pontian boat of Malaysia dated to at around c.260–430 CE.

Hit or Heet (Arabic: هيت, Hīt) is a city in Al Anbar Governorate of Iraq. Situated on the banks of the Euphrates River, it lies northwest of Ramadi, the provincial capital. The city is administrative capital for Hit District. A major city in the central region, it has a population over 100,000.

Straddling the Euphrates, the city of Hit was originally a small walled town surrounded by a halt moat and built on two mounds on the site of the ancient city of Is. In ancient times, the town was known for its bitumen wells; bitumen from the wells was used in the construction of Babylon over 3000 years ago, and for tasks such as caulking boats. Hit also became a frontier fortress for Assyria. Now, Hit is a marketplace for agricultural produce. Oil pipelines to the Mediterranean Sea cross the Euphrates there. It was regarded as the head of navigation on the river before the decline in river traffic.

El Calafate, also called Calafate, is a city in the Argentine province of Santa Cruz, in Patagonia. It is located on the southern border of Lago Argentino, in the southwest part of the province (about 320 kilometres (200 mi) northwest of Río Gallegos). It is the seat of government for the Lago Argentino Department within the province. The name of the city is also the name of a small bush, with yellow flowers and dark-blue berries, that is very commonly seen in the region—the calafate (Berberis buxifolia). The word comes from the word calafate, which is Spanish for 'caulk'.

El Calafate is an important tourist destination, serving as the hub for visitors of different parts of Los Glaciares National Park, Perito Moreno Glacier, Cerro Chaltén, and Cerro Torre, in addition to the area surrounding Lago Argentino.

A tube, squeeze tube, or collapsible tube is a collapsible package which can be used for viscous liquids such as toothpaste, artist's paint, adhesive, caulk, & ointments. Basically, a tube is a cylindrical, hollow piece with a round or oval profile, made of plastic, paperboard, aluminium, or other metal. In general, on one end of the tube body there is a round orifice, which can be closed by different caps and closures. The orifice can be shaped in many different ways: plastic nozzles in various styles and lengths are most typical. The other end is sealed either by welding or by folding.

Typical tube sizes range from 3 ml (0.11 imp fl oz; 0.10 US fl oz) to 300 ml (11 imp fl oz; 10 US fl oz). Most tubes are designed to be dispensed with hand pressure, but some are used with a tube key at the base to help roll them up.

Polydimethylsiloxane (PDMS), also known as dimethylpolysiloxane or dimethicone, is a silicone polymer with a wide variety of uses, from cosmetics to industrial lubrication and passive daytime radiative cooling.

PDMS is particularly known for its unusual rheological (or flow) properties. It is optically clear and, in general, inert, non-toxic, and non-flammable. It is one of several types of silicone oil (polymerized siloxane). The applications of PDMS range from contact lenses and medical devices to elastomers; it is also present in shampoos (as it makes hair shiny and slippery), food (antifoaming agent), caulk, lubricants and heat-resistant tiles.

Sealant is a substance used to block the passage of fluids through openings in materials, a type of mechanical seal. In building construction sealant is sometimes synonymous with caulk (especially if acrylic latex or polyurethane based) and also serve the purposes of blocking dust, sound and heat transmission. Sealants may be weak or strong, flexible or rigid, permanent or temporary. Sealants are not adhesives but some have adhesive qualities and are called adhesive-sealants or structural sealants.