1 - DESCRIPTION Demsun Q21 is a non-toxic, solvent-free silicone sealant for use in aquarium construction and glazing applications. It's a high-quality acetic curing system based silicone sealant featuring excellent adhesion to glass and many other non-porous surfaces. 2 - PROPERTIES • 100% silicone • Very good bond and physical strength • Rapid curing • Non-toxic to fish • One component, cures with atmospheric moisture • Keep its elasticity at low and high temperatures • Does not crack, discolour or shrink • Resistant to many chemicals • Resistant to UV radiation 3 - APPLICATIONS • Bonding, sealing and repairing of aquariums • Construction of glass structures • On glass/aluminum structures • Sealing of windows and doors • Sealing of ventilation, heating and air-conditioning systems • Glazing on aluminum frames and shop displays 4 - INSTRUCTIONS • Ensure that surfaces to be sealed are clean, dry and grease free. • The application temperature must be between +5 °C and +40 °C. • After the application, the sealant must be tooled with light pressure within 5 minutes to spread the material against the joint surfaces and to obtain a professional finish. • Excess uncured sealant may be cleaned with solvent. Cured sealant can be removed barely mechanically. STORAGE AND SHELF LIFE • 18 months if stored properly. RESTRICTIONS • Not suitable for applications in direct contact with marble, granite or other natural stones. • Not recommended for direct contact with mirror and metals such as lead, copper, zinc or brass as it may cause corrosion. • Not paintable. 8- SAFETY If inhaled for a long time in large volumes, vaporizing acetic acid may cause irritation of the respiratory system. Therefore, the application must take place in a well-ventilated room. Prolonged contact with uncured sealant must be avoided.
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