Sui Northern Gas Pipelines Limited (SNGPL) invites bids for the supply of various chemicals including AR grade solvents, calibration solutions compatible with Hanna pH meters, oil analyzer calibration fluids, and lube oil sampling kits. The delivery and installation are required within 30 days at SNGPL Stores, Multan. Bidders must submit bids online via PPRA E-PADS and also provide sealed hard copies before the closing date. The tender includes detailed technical specifications and requires compliance with all terms including bid security, tax certificates, and valid professional tax clearance. Evaluation will be item-wise and bids must remain valid for 60 days from closing.