Sealants hot applied

D 3569 Specification for Joint Sealant, Hot Applied, Elastomeric, Jet Fuel Resistant Type for Portland Cement Concrete Pavements... 

ASTM D 3406. 2006. Standard specification for joint sealant, hot-applied, elastomeric-type, for Portland cement concrete pavements. West Conshohocken, PA ASTM International. 

Strip Sealants—Hot-Applied Preformed Strips. These sealants are also supplied with backing paper. The backing paper is removed from a suitable length of strip sealant and fit into the slot to be sealed. The strip is then heated to the manufacturer s recommended temperature. Caution must be taken that the heat-softened material achieves continuous... 

Crack and joint sealants are applied only on cracks and joints. Seal coats include hot asphalt-rubber sprayed on the surface followed by precoated aggregate. Interlayers are the application of seal coats followed by either a standard overlay or an asphaltic-rubber overlay. Asphalt-rubber, when blended with an aggregate hot mix at about 9 to 10 percent by weight, serves as a binder in the thin overlay applied to the road surface. The hot mix binder holds the greatest potential for using large quantities of scrap rubber because of the thickness and quantity of the overlay. 

Test Method for Adhesion in Peel of Elastomeric Joint Sealants Recommended Practice for Surface Preparation of Concrete for Application of Chemical Resistance Resin Monolithic Surfaces Method of Testing Release Papers Used with Preformed Tape Sealants Test Method for T-Peel Strength of Hot Applied Sealants Test Method for Tensile Adhesive Strength of Preformed Tape Sealants by Disk Method... 

D 4259 D 4260 D 5167 Practice for Abrading Concrete Practice for Acid Etching Concrete Practice for Melting of Hot Applied Joint and Crack Sealant and Filler for Evaluation... 

D 5249 Specification for Backer Materials for Use with Cold and Hot Applied Joint Sealants in Portland Cement Concrete and Asphalt Joints... 

CEN EN 14188-1. 2004. joint fillers and sealants - Fart 1 Specifications for hot applied sealants. Brussels CEN. 

The sealants are usually modified bituminous materials applied hot or cold. The hot applied sealant materials should comply with the requirements of specifications such as CEN EN 14188-1 (2004) or ASTM D 6690 (2012). The cold applied sealants should comply with the requirements of specifications such as CEN EN 14188-2 (2004) or ASTM D5893 (2010). 

In particular, when the crack width is between 3 and 10 mm, the crack is usually sawn or routed to a width of 6 to 12 mm. The sawn crack is then cleaned and sealed with hot-applied sealant. If the cracks are more than 50 mm deep, a backer rod is recommended to be installed to conserve sealant. 

Sealant materials could be hot applied (complying with CEN EN 14188-1 2004 or ASTM D 6690 2012), cold applied (complying with CEN EN 14188-2 2004 or ASTM D 5893 2010) or preformed joint seal material applied by compression (complying with CEN EN 14188-3 2006, ASTM D 2628 2011 or other specifications). When backer material is used, it should comply with ASTM D 5249 (2010) or any other specification. 

Kratons are used in PSAs, hot-melt adhesives, sealants, solution-applied coatings, flexible oil gels, modifiers in asphalt, thermoplastics, and thermosetting resins. When Kratons are used as an impact modifier in nylon 66, notched Izod impact strength can be increased from 0.8 ft-lb/in for unmodified nylon 66 to 19 ft-lb/in. Flexural modulus may decrease from 44,000 Ib/in (302 MPa) for unmodified nylon 66 to about 27,000 Ib/in (186 MPa) for impact-modified nylon 66. 

Thermoplastic sealants are, in general, either preformed sealants or hot-applied polymeric sealants. 

Hot-applied polymeric sealants are formulated with a carefully balanced blend of polymer with certain compounds, like asphalt, plasticisers and inert reinforcing fillers to produce a hot-pour point sealant with excellent bonding properties, high resiliency, ductility and resistance to degradation from weathering, to provide a positive seal during expansion and contraction of the joint. 

Hot applied sealants provide excellent bonding, high resiliency with a positive seal while ambient applied sealants are usually in the semi-cured state and can be one- or two-part. 

Asphaltic materials are supplied in solvent-diluted, emulsion, or hot-poured forms. Rubber is used for reinforcement in high solids formulations. The latter are more important because of better adhesion and lower shrinkage. Typically, the sealant contains 50-60% asphalt blend (needle penetration 10-110), 20-30% ground rubber (from tire scrap) and 20% cyclic hydrocarbon. The sealant is applied at 250-400°F. Durability can be as high as 5 years if properly applied. 

Hot Melt, Field-Extruded Sealants. Several butyl raw material manufacturers and sealant producers have recently developed butyl tapes. These are premasticated, high viscosity thermoplastic compositions that are fed as talced ribbons into a polymeric sealant applicator (PSA). Within the PSA, the compound is heated and extruded into the joint opening to form a smooth joint that cools rapidly with excellent adhesion claimed, even to oily or otherwise poorly prepared surfaces. These hot-applied, post-formed butyl tapes have been successfully used to seal insulated glass units, automotive windshields (Fig. 4), curtain walls, concrete pipes, precast concrete structural joints, and as bedding compounds in combi-... 

Table 10. Butyl Hot-Melt Sealant (Black, Hot Applied).

Specification for high solids content, cold liquid-applied elastomeric waterproofing membrane with integral wearing surface Test for lap shear strength for hot applied sealing compounds Guide for use of elastomeric joint sealants Test for compression/recoveiy of tape sealants... 

A sealant, such as Apiezon W, is a good example of a material that was designed for an extremely limited application. Apiezon W is a hard black wax that needs to be heated to 80°-90°C before it is soft enough to apply to the members you wish to join. At room temperatures it is hard and has no lubrication abilities whatsoever and is therefore not usable for a stopcock. It has a relatively high vapor pressure (10 3 torr), so it cannot be used for most vacuum work. However, at temperatures of about 100° to 150°C, it becomes very thin like hot honey and can easily be applied to joint members. Therefore, if you have a standard taper joint that will not be in a high-heat or ultrahigh-vacuum environment, there is no need to separate often, and you don t want it to accidentally separate, Apiezon W is the type of sealant you need. 

S-EB-S block copolymers have a saturated midblock and so can be compounded with suitable resins and oils to make adhesives and sealants that have improved stability during long-term or extreme temperature exposure. In addition, hot-melt adhesives formulated from these polymers are more stable under melt processing conditions and can be applied at high temperatures. Nitrogen-blanketing is not required. Stable adhesives and sealants with large amounts of oils and resins can be formulated from these polymers. 

Chem. Descrip. Aromatic hydrocarbon resin Uses Tackifier in elastomer-based solv., water, and hot-melt sealants and adhesives processing aid, reinforcing agent in rubber compd. and extruding applies. in metallic cold-cut paints food-pkg. and processing applies. 

Chem. Descrip. Calcium sulfonate/carbonate complex Uses Conosion inhibitor for use as a hot-melt coating in automotive applies, (body, frame, sealant, caulk)... 

---