Isophthalic Acid CAS 121-91-5

1. Isophthalic acid CAS 121-91-5 is a fundamental building block for producing high-performance unsaturated polyester resins used in marine (boat hulls), automotive, and construction industries for their enhanced chemical resistance and mechanical strength .
2. Isophthalic acid serves as a key modifier in PET copolymer resins to improve the clarity, strength, and recyclability of beverage bottles and food packaging .
3. Applications of Isophthalic acid also include its use as a precursor for high-performance polyamides (Nomex) for aerospace and fire-resistant materials, powder coatings with superior weather resistance, and specialty alkyd resins for fast-drying industrial coatings .

1. Store Isophthalic acid CAS 121-91-5 in a tightly sealed container in a cool, dry, and well-ventilated place, preferably below 15°C and protected from light to prevent degradation .
2. Keep Isophthalic acid away from strong oxidizing agents and strong bases due to incompatibility; it is also important to prevent dust accumulation as finely dispersed particles can form explosive mixtures in air .
3. Always use Isophthalic acid appropriate personal protective equipment (PPE) including protective gloves, safety spectacles, and a particulate filter respirator when handling Isophthalic acid powder to avoid mechanical irritation and dust inhalation .

1. Immediately contain the Isophthalic acid CAS 121-91-5 spill using personal protective equipment; sweep the spilled substance into covered containers, moistening first to prevent dusting if appropriate, and prevent material from entering drains or waterways .
2. Carefully collect the Isophthalic acid solid using clean methods and place the contaminated material into sealed, labeled chemical waste containers for proper disposal according to local, state, and federal environmental regulations .
3. Personnel must Isophthalic acid wear suitable PPE including particulate filter respirators during cleanup; Isophthalic acid is not classified as a hazardous material for transport by some regulations .

1. Isophthalic acid CAS 121-91-5 is classified with a GHS signal word "Warning" and may cause eye irritation (H320/H319), skin irritation (H315), and respiratory irritation (H335) upon dust inhalation or prolonged contact .
2. Isophthalic acid is combustible with an auto-ignition temperature >650°C; dust explosion possible if in powder form mixed with air, and thermal decomposition produces irritating fumes including carbon oxides .
3. Isophthalic acid is poorly soluble in water with an NFPA health rating of 1 (irritation only), and may be toxic to aquatic life with long-lasting effects; always consult the specific Safety Data Sheet (SDS) for complete hazard information and first-aid procedures.