Page 26 - Handbook of Adhesives and Sealants

Contents xiii

13.4.1 Fluorosilicone and fluoropolymer sealants 488
13.4.2 Polysulfides 489
13.4.3 Polyethers 490
13.4.4 Polyurethane 492
13.4.5 Silicone 496
13.4.6 Styrene butadiene copolymer sealants 497
13.4.7 Chloroprenes 498
13.4.8 Other specialty sealants 498

Chapter 14. Selecting and Using Sealants 501
14.1 Introduction 501
14.2 Nature of the joint design 502
14.2.1 Common butt and lap joints 503
14.2.2 Backup materials 508
14.2.3 Threaded joints 508
14.2.4 Gasketing 509
14.2.5 Porosity sealing 512
14.3 Sealant substrates 513
14.3.1 Surface preparation 515
14.3.2 Primers 515
14.3.3 Common substrate surfaces 515
14.3.3.1 Concrete and masonry 516
14.3.3.2 Stone 516
14.3.3.3 Glass and porcelain 517
14.3.3.4 Painted surfaces 517
14.3.3.5 Unpainted metal 517
14.4 Application requirements 518
14.4.1 Bulk materials 518
14.4.2 Tape sealants 522
14.4.3 Preformed gaskets 523
14.4.4 Foam sealants 523
14.4.5 Application properties 524
14.4.5.1 Rheological properties 524
14.4.5.2 Ambient temperature on application 525
14.4.5.3 Cure rate 525
14.5 Performance requirements 526
14.5.1 Movement capability 527
14.5.2 Other mechanical properties 530
14.5.3 Adhesion 531
14.5.4 Durability 532
14.5.5 Appearance 534
14.6 Sources of information and assistance 534

Chapter 15. Methods of Joining Plastics Other Than With
Adhesives 537
15.1 Introduction 537
15.2 Plastic materials 538
15.3 Joining methods for plastics 542
15.4 Direct heat welding 543
15.4.1 Heated tool welding 543
15.4.2 Hot gas welding 553