Main Application Scenarios and Raw Materials of Elastic Concrete Caulk

Category	Primary Types & Application Scenarios	Primary Raw Material Composition
Elastic Concrete (Filling Type)	Bridge Expansion Joint Filling: Withstands vehicle impact and joint deformation. Road & Airport Runway Repair: Used for repairing bridge decks, airport runways, subway track beds; helps reduce noise and vibration. Rail Transit Facilities: Filling around areas such as railway switches and tram tracks.	Epoxy Resin as the binder. Rubber Particles as the elastic aggregate. Curing Agents and other chemical additives.
Elastic Sealant (Joint Sealing Type)	Building Joint Sealing: Sealing expansion joints in precast concrete panels, curtain walls, roofs, plazas, and various structural joints. Door/Window Frame Perimeter Sealing: Filling gaps between frames and walls. Pipe Penetration Sealing: Sealing voids around pipes penetrating walls.	Modified Polymers: e.g., MS Polymer (Silyl Modified Polyether), Polyurethane, Silicone, Acrylic. Fillers: e.g., Calcium Carbonate, Talc. Additives: Including tackifiers, thixotropic agents, curing agents, etc.

How to Choose Elastic Sealing Materials

For different needs, you can refer to the following points for selection:

Based on Joint Movement Capacity

For joints with significant expansion and contraction movement (e.g., large bridge expansion joints, precast building panel joints), choose products with high elastic recovery and movement accommodation capacity, such as sealants labeled with a "joint movement capability" of ±25% or even ±50%.

For joints with minimal movement (e.g., around door/window frames, crack filling), sealants with lower movement capacity (e.g., ±10% to ±20%), such as acrylic-based types, can be chosen.

Based on Usage Environment

Wet or Underwater Environments: Choose elastic materials that can be applied on damp surfaces or even cure underwater (e.g., some elastic cement waterproofing materials or specially formulated polyurethane sealants).

High-Temperature or Chemical Environments (e.g., swimming pools, workshops): Pay attention to the material's temperature resistance and chemical resistance.

Traffic Areas: Consider the material's abrasion resistance and impact resistance. Here, epoxy-rubber elastic concrete is a common choice.

Focus on Other Key Performance Attributes

Adhesion: Ensure good adhesion to substrates like concrete, metal, and glass. Test on unfamiliar substrates before full application if possible.

Curing Mechanism: Available in single-component (cures with ambient moisture, user-friendly) and dual-component (requires mixing, cures faster and depth is not limited) forms. Choose based on application efficiency and requirements.

Environmental Considerations: For interiors or poorly ventilated areas, prioritize water-based, low-VOC (Volatile Organic Compounds), or solvent-free products

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