Most importers who've had a bad experience with a charcoal supplier can trace the problem back to the same root cause: they didn't ask the right questions before committing. A coconut charcoal manufacturer who can't answer these 20 questions clearly, specifically, and with documentation is a manufacturer who is either hiding something or doesn't know their own operation well enough to be trusted with your supply chain. Use this list on every supplier call. Take notes. Compare answers across suppliers. The gaps will tell you everything. Questions About Production and Manufacturing 1. "Do you manufacture in-house, or do you source from other factories?" This is the foundational question. You need to know if you're talking to the producer or a middleman. A genuine manufacturer can answer with specific details about their own production process, equipment, and location. A trading company will give a vague answer or change the subject. What you want to hear: "We have our own factory at [location] with [number] briquette presses and [carbonization method]." Red flag: "We work with trusted manufacturing partners." Translation: they don't make it. 2. "What is your monthly briquette production capacity?" A real manufacturer knows this number precisely. It's determined by how many presses they run, at what shift schedule, for how many production days per month. What you want to hear: A specific number in metric tons per month, e.g., "300–350 MT/month at two-shift operation." Red flag: "Capacity can be adjusted to meet demand." This means they don't have a fixed facility — they're aggregating from multiple sources. 3. "Do you operate your own carbonization kilns, or do you purchase ready-made shell charcoal?" Some Indonesian briquette manufacturers buy shell charcoal from external carbonization operations and only do the pressing and packaging themselves. This isn't necessarily disqualifying, but it means they have less control over the most quality-critical step — carbonization. What you want to hear: Either "We operate our own kilns" (full vertical control) or "We source shell charcoal from [specific verified suppliers] and have ongoing quality agreements with them" (acceptable if transparent and verified). Red flag: Vague answer, or they claim to do everything but can't describe their kiln setup. 4. "What temperature and duration do your carbonization kilns operate at?" This question distinguishes manufacturers who understand their process from those who don't. Premium shisha-grade coconut charcoal requires carbonization at 600–700°C for 6–10 hours. A manufacturer optimizing for throughput shortens this cycle — and the product quality suffers predictably. What you want to hear: Temperature range stated (600–700°C) and typical batch duration (6–10 hours for premium grade). Red flag: "I'm not sure exactly" or "depends on the batch" — neither is acceptable for a quality-controlled process. 5. "What is your briquette drying method — industrial dryer or sun drying?" Moisture content at ≤5% is a firm requirement for premium shisha charcoal. Industrial tunnel dryers deliver this consistently. Sun drying is weather-dependent and produces variable results. What you want to hear: "Industrial tunnel dryer with temperature control" for premium product. Acceptable: Sun drying for BBQ grade with confirmed moisture testing before packaging. Red flag: Sun drying claimed for shisha-grade product with no additional moisture verification. 6. "What press machines do you use, and how many do you operate?" Press type determines what shapes a manufacturer can produce. The number of presses confirms capacity claims. Hydraulic cube presses for shisha, screw extruders for finger shapes, pillow presses for BBQ. What you want to hear: Specific machine description and count consistent with their claimed monthly capacity. Red flag: Vague answer, or factory photos show only one press claiming "500 MT/month" capacity. Questions About Quality Control 7. "Can you provide a Certificate of Analysis from SGS, Intertek, or Bureau Veritas for your current production?" Non-negotiable. Third-party lab documentation from an internationally accredited testing body is the minimum evidence standard for quality claims. Domestic lab certificates from unknown testing houses are not equivalent. What you want to hear: "Yes, here is our current CoA" (attached immediately or within 24 hours). Red flag: "We can arrange testing for your order" — meaning they don't have one already. Any serious coconut charcoal manufacturer tests routinely. 8. "What fixed carbon, ash, and moisture percentages do you consistently achieve?" Ask this before showing them your specification. A manufacturer who states their actual production range honestly — rather than quoting back whatever number you mentioned — is operating transparently. What you want to hear: Specific numbers with realistic acknowledgment of batch variance (e.g., "Fixed carbon typically 80–83%, occasionally 79% on off-peak shell supply"). Red flag: Any number you want to hear, stated instantly and without qualification. 9. "What is your internal QC rejection rate per production batch?" Every serious manufacturer has a quality control step and a rejection rate. Typical range for a disciplined operation: 2–5% reject on dimensional check, 1–3% on moisture test. Zero rejection rate claims are not credible. What you want to hear: A specific percentage with a brief description of what triggers rejection. Red flag: "We reject nothing — all our product is perfect." 10. "How do you handle a batch that fails your QC standard?" This tells you whether QC is a real process or a formality. Rejected batches should be re-dried, re-pressed, or downgraded — not shipped as premium product. What you want to hear: Clear description of re-work or downgrade process. Red flag: "It hasn't happened" or vague deflection. 11. "What binder do you use and can you provide the food-grade certificate for it?" For shisha charcoal, only food-grade tapioca starch is acceptable. Non-food-grade binders, synthetic adhesives, or undisclosed additives are disqualifying for premium markets and potentially harmful. What you want to hear: "We use food-grade tapioca starch with a food-grade supplier certificate available." Red flag: Reluctance to identify the binder, or reference to "natural starch" without specifics. Questions About Raw Material 12. "Where do your coconut shells come from, and how do you grade incoming material?" Premium shisha charcoal requires thick-walled, mature shells from established coconut growing regions. A manufacturer who buys undifferentiated mixed shell from any available source has variable input quality that produces variable output quality. What you want to hear: Named supplier regions (Riau, North Sumatra, West Java) and description of incoming shell quality assessment process. Red flag: "We buy shells wherever available at the best price." 13. "How does seasonal shell availability affect your pricing and lead times?" This question reveals supply chain sophistication. Coconut shell supply has seasonal patterns. A manufacturer with secured supply contracts can offer price stability; one buying on the spot market cannot. What you want to hear: Acknowledgment of seasonality with explanation of how they manage it (forward contracts, inventory stockpiling). Red flag: "Supply is always available, no problem." Oversimplification of a real market dynamic. Questions About Export Experience 14. "How long have you been exporting, and which countries do you currently ship to?" Export experience correlates strongly with documentation competence and logistics reliability. A manufacturer who has been exporting to Germany, Australia, and the UAE for 8 years has encountered and solved the compliance challenges that trip up newer exporters. What you want to hear: Named countries with honest duration. Cross-check against trade data. Red flag: Implausibly broad claim ("We ship to 50 countries") with no specifics on who buys from them. 15. "Have you ever had a shipment held or rejected at customs, and how did you resolve it?" This question is counterintuitive — you're not looking for "never happened." You're looking for evidence of how they handle problems. An experienced exporter will have encountered at least one documentation issue. How they resolved it tells you more than a smooth track record claim. What you want to hear: Honest account of a specific incident and specific resolution. Red flag: "It has never happened, our documentation is perfect" — statistically implausible for any multi-year exporter. 16. "What does your standard export documentation package include?" A competent coconut charcoal manufacturer should answer this without hesitation: Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin (KADIN), SGS CoA, Phytosanitary Certificate (where required), MSDS. Each document should be produced by the right entity. What you want to hear: Complete list matching the above, with knowledge of which markets require which documents. Red flag: Uncertainty about which documents they provide or confusion about document issuance authority. Questions About Commercial Terms 17. "What are your standard payment terms for first-time and repeat buyers?" Standard Indonesian charcoal export terms: 30–50% TT deposit, balance before shipping or against BL copy. Anything dramatically different in either direction warrants explanation. What you want to hear: Clear standard terms with openness to discuss evolution as the relationship matures. Red flag: 100% upfront demand from an unknown supplier, or 100% deferred payment offered (too good to be true). 18. "What is your lead time from Purchase Order to cargo-ready?" Standard lead time: 14–21 days for standard product. 35–55 days for first OEM order with custom packaging. Any lead time significantly shorter should be questioned (is it pre-made stock matching your spec?). Any significantly longer needs explanation. What you want to hear: Specific lead time tied to their production schedule and explained by their process. Red flag: "We can ship in 3 days" for a custom spec order — physically impossible with proper production. 19. "Do you offer pre-shipment inspection and will you allow an SGS inspector on-site?" Any professional coconut charcoal manufacturer welcomes pre-shipment inspection by internationally accredited inspectors. It protects both parties and is standard practice for serious B2B relationships. What you want to hear: "Yes, we regularly work with SGS and welcome on-site inspection." Red flag: Any resistance to pre-shipment inspection. A manufacturer who won't allow third-party inspection of finished goods before loading has something to hide. 20. "Can you provide two or three buyer references I can contact directly?" Final and critical. A manufacturer with a real commercial track record has satisfied buyers who will confirm their experience. References should be in markets and at volume levels comparable to yours. What you want to hear: Specific company names and contact persons, provided without hesitation. Red flag: "Our clients are confidential." Reasonable confidentiality about buyer identity is understandable; refusing to provide any reference contact is not. How to Score Your Conversations After running these 20 questions across 3–5 candidate manufacturers, score each supplier on a simple 1–3 scale per question: 3: Specific, confident, backed by documentation 2: Adequate but vague or documentation pending 1: Deflected, inconsistent, or no documentation Any supplier scoring 2+ on the majority of questions and at least one 3 for the documentation questions (7, 15, 16, 19, 20) is worth advancing to sample stage. Suppliers with multiple 1-scores in documentation or production questions should be removed from consideration regardless of their price. Frequently Asked Questions Should I ask all 20 questions on the first call? No. Group them logically: production questions in one session, quality/documentation questions in the next. The goal is a natural conversation that reveals how the manufacturer thinks about their work — not an interrogation. A supplier who is suspicious of thorough due diligence is itself a warning signal. What if a manufacturer seems offended by these questions? A professional export manufacturer is familiar with due diligence. These questions are standard in any serious B2B relationship. A supplier who becomes defensive about being asked to document their product quality or company registration is showing you something important about how they'll handle problems once your money is committed. Can I send these questions in writing instead of by call? Yes, written questions serve as documentation and force clarity. Many buyers send an initial written questionnaire and follow up with a call to discuss answers in detail. This also gives you a written record of commitments made before ordering. Ready to Put Mono Charcoal Through This Process? Mono Charcoal answers every one of these questions — specifically, in writing, with documentation. We manufacture coconut shell charcoal briquettes at our own production facilities in West Java, with fully controlled carbonization, industrial drying, and SGS-verified quality on every production batch. Run us through your list.