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High Quality Black Powder for Oil Drilling Fluids Sulfonated Asphalt. Factory Direct Supply: We are a manufacturer specializing in oil drilling fluid chemical products. Flexible Customization: Supports full customization, minor customization, and customization from samples or designs. High Quality Standards: ISO9001:2015, ISO45001:2018, and ISO14001 certified with strict QA/QC inspection. Fast Delivery: Average lead time within 15 workdays for both peak and off-season periods. Free Sample Available: Free samples provided for quality verification, though freight is not covered. Wide Payment Options: Accepts LC, T/T, D/P, PayPal, Western Union, and small-amount payments.