In high-rise curtain walls, large-size metal (aluminum panel) and glass curtain wall weatherproof sealing, traditional multi-part sealants require on-site mixing; ratio errors easily cause curing defects, bubbles or cracks, with low efficiency and high quality fluctuation. Some one-part sealants with poor extrudability and insufficient thixotropy sag and flow on vertical surfaces, making it hard to fill wide/deep joints and finish neatly. Low-movement-capability sealants suffer fatigue failure under wind load, seismic or thermal interlayer displacement, leading to water leakage and air seal loss. Ordinary sealants lack UV, ozone, rain, and snow resistance; long-term outdoor aging hardens, cracks and powders them, losing elastic recovery. Blind use on porous substrates (stone, concrete) or metals (copper, lead, galvanized steel) risks bond failure or corrosion. For specifications demanding "one-part RTV, high elasticity and elongation, 100/50 class movement capability, primerless broad adhesion, weather and aging resistance", a strictly quality-controlled silicone weatherproof sealant places long-term joint protection at the construction source. Addressing this, Anhui IOTA Silicone Oil Co., Ltd. launches Silicone Weatherproof Sealant IOTA 1098. Characterized by "one-part, RTV, good extrudability and thixotropy; high elasticity, high elongation, good tension-compression recovery, movement capability 100/50 class; good weather aging, UV, ozone, rain, snow resistance; good high-low temperature performance; no primer needed, good adhesion to most materials; colors black, gray, White or custom; standards GB/T 22083-2008 100/50 class, ASTM C 920-2005; packaging 300ml cartridge, 590ml sausage; typical properties: slump vertical ≤3mm (actual 0), horizontal no deformation; extrusion ≥80ml/min (actual 685/696); skin time ≤3h (actual 1.5h); elastic recovery ≥70% (actual 87/89%); tensile modulus 23℃ 0.38/0.8MPa, -20℃ 0.57/—; static extension adhesion, cyclic extension-compression, immersion-UV extension adhesion all non-destructive; heat aging weight loss ≤10% (actual 3.9/4.1%), no cracking/powdering; storage below 27℃ dry ventilated cool place, 12 months from production date; cannot be used as structural sealant; not for materials exuding oil/plasticizer/solvent, unventilated spaces, frosted/damp surfaces, continuous immersion; porous materials need manufacturer approval; not for copper, lead, galvanized metal surfaces", backed by "one-part RTV + elastic movement + thixotropic anti-sag + broad adhesion", it serves as a high-performance silicone weatherproof sealant for building curtain wall joints. System Positioning: Silicone Weatherproof Sealant Among Sealant Families Within building sealant families, IOTA 1098 is a one-part RTV silicone weatherproof sealant, distinct from silicone structural sealants (load-bearing, tension/shear, cannot substitute structural glue), two-part silicone sealants (need mixing, fast cure but complex), polyurethane sealants (limited UV resistance, prone to yellowing), and modified silane sealants (usually lower elastic recovery and movement capability). Based on silicone polymer, IOTA 1098 is designed for weather protection of building joints, with 100/50 class movement (GB/T 22083-2008, ASTM C 920-2005). It positions as a dedicated weather sealant for "high-rise curtain walls, large metal/glass facades + high-safety sealing occasions", rather than structural bearing or interior low-demand caulking. Molecular Architecture: Hydroxy-Terminated Polysiloxane + Reinforcing Filler + Crosslinking Condensation + Elastic Siloxane Network IOTA 1098 uses α,ω-hydroxy-terminated polydimethylsiloxane as base polymer, with fumed silica reinforcing fillers, crosslinker (alkoxysilane), catalyst and pigments, forming a one-part non-sag paste. After application, surface absorbs moisture from air; crosslinker hydrolyzes to silanol, condensing with terminal hydroxyl to form a 3D Si–O–Si elastic network. This siloxane backbone with high bond energy and low polarity grants excellent UV, ozone, rain, snow aging resistance and wide high-low temperature service range. High elongation and elastic recovery come from flexible siloxane chain segment mobility; 100/50 class movement means the joint withstands ±50% extension and -50% to +100% compression cycles without failure. Extrusion rate 685–696ml/min ensures smooth application; thixotropy prevents sag; slump actual 0mm secures deep joint filling. Performance Leap: From "Multi-Part Mixing, Low Movement Aging" to "One-Part Thixotropic Elastic Weathering" With IOTA 1098, building curtain wall weather sealing improves: application efficiency—one-part no mixing, ready to use, extrusion far exceeding ≥80ml/min, thixotropic anti-sag, no flow on vertical, easy tooling; elastic movement—100/50 class movement, elastic recovery actual 87–89% (std ≥70%), strong tension-compression resilience adapts to interlayer displacement, thermal expansion and wind vibration; weathering life—UV, ozone, rain, snow resistance, immersion-UV extension non-destructive, heat aging weight loss only 3.9–4.1% (std ≤10%), no cracking/powdering, long-term outdoor elasticity; broad adhesion—no primer needed for most building materials (glass, anodized aluminum, ceramic), cyclic extension-compression non-destructive; skin time actual 1.5h (std ≤3h) accelerates schedule and reduces dust pickup. Application Penetration: From High-Rise Curtain Walls to High-Safety Sealing Occasions IOTA 1098 covers two core scenarios. High-rise curtain walls and large metal (aluminum)/glass curtain wall weather sealing: exterior building joints, interlayer expansion joints, weather waterproofing between glass and metal frames—emphasizing movement capability, elastic recovery and weathering; joint width/thickness per JGJ 102 etc., surface cleaning before application. Other occasions with high sealing safety requirements: clean rooms, cold storage, ship portholes needing weatherproof waterproofing and inconvenient rework; substrate suitability requires trials or consultation. ⚠️ Taboo: cannot be used as structural sealant; not for materials exuding oil/plasticizer/solvent (oily wood, unvulcanized EPDM); not for unventilated spaces (curing needs moisture), frosted/damp surfaces (poor adhesion), continuous immersion or year-round wet places; porous materials (stone, concrete) must be approved by manufacturer; not for copper, lead, galvanized metal surfaces (possible corrosion or bond failure). IOTA Technical Guide: Clean Substrate, Humidity Control, Clear Restrictions IOTA 1098 is a one-part paste, packaged in 300ml cartridge or 590ml sausage. Before application, ensure substrate surface clean, dry, free of oil/dust; non-porous materials can be wiped with solvent; application temperature 5–40℃, relative humidity 40–80%, low temp/humidity extends skin and cure; after extrusion, tool immediately to ensure close contact and avoid air bubbles; avoid touching or contaminating before skin formation; avoid severe displacement within initial 24h cure. Store below 27℃ in dry, ventilated, cool place; shelf life 12 months from production date; check appearance and extrudability if expired; reseal unused cartridges/sausages to prevent skinning. Industry Insight: The key to silicone weatherproof sealant for building protection is not just filling the joint, but using movement capability for joint life, elastic recovery for fatigue durability, slump and extrusion for application efficiency, heat aging and immersion-UV for weathering years. For curtain wall and building engineers, IOTA 1098 uses one one-part silicone weather sealant across high-rise curtain walls, large metal and glass facades, taking 100/50 movement, thixotropic anti-sag, broad adhesion and weathering resistance as batch-checkable anchors, reducing multi-part mixing errors, low-movement cracking, and weather-aging rework.