Xuchang Chengrui Insulation Materials Co., Ltd.
Henan Province, China
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Diego Martínez, a 52-year-old business man, founded Transformadores del Sur in 2018, specializing in mid-voltage transformers for agricultural cooperatives and small hydroelectric plants across Paraguay. Based in Encarnación, his company prided itself on supporting rural electrification projects. But by early 2023, Diego faced a crisis: his German insulation paper supplier abruptly raised prices by 30%. amid global supply chain disruptions, forcing him to halt two key projects in Concepción.
Paraguay’s lack of domestic insulation paper production left Diego dependent on imports. European suppliers offered quality but demanded 60-day lead times and rigid 50-ton minimum orders, unfeasible for his small-batch production model. A stopgap order from Chile in April 2023 backfired when paper thickness inconsistencies caused 14%. of his transformers to fail safety audits. With clients threatening penalties, Diego needed a supplier that balanced affordability with precision.
At the August 2023 trade fair in Limpio, Diego lingered at ChengRui’s booth after noticing a side-by-side comparison of insulation papers under heat stress. ChengRui Sales engineer has demonstrated how their Class F insulation paper maintained structural integrity at 155°C—critical for transformers operating near Paraguay’s soybean processing plants. Skeptical, Diego asked a question: “How can a Chinese factory understand our humidity challenges?” ChengRui responded by soaking a sample in water for 10 minutes; when tested, its dielectric strength still exceeded IEC 60641 standards.
Three factors convinced Diego:
1 Cost Transparency: ChengRui’s $3.20/kg pricing undercut European rivals by 25%. with no hidden import fees.
2. Faster Logistics: A partnership with a Brazilian freight forwarder ensured 18-day door-to-door delivery via Paraná River ports.
3. Customization: ChengRui adjusted paper density to 1.1 g/cm³ for better compatibility with Diego’s aging pressing machines.
Diego’s initial 2-ton trial order arrived in September 2023. His team noted the paper’s uniform thickness (0.15mm ±0.01mm), eliminating manual calibration delays. Within weeks, Transformadores del Sur resumed stalled projects, delivering 37 transformers to Neuland Cooperative without a single defect. By March 2024, Diego slashed material costs by 22%. and secured a 200-transformer contract with Itaipú’s rural grid expansion—a deal he’d previously lost due to pricing.
Today, Diego credits ChengRui for helping him pivot from survival to growth. He’s since introduced a budget transformer line using ChengRui’s economy-grade paper, tapping Paraguay’s underserved small-farm market. “They treated my 2-ton order like a 200-ton project,” he remarked to La Nación’s business column last month.
For Paraguayan industrialists like Diego, choosing ChengRui isn’t about finding a supplier—it’s about gaining a partner who engineers solutions, not just products.
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