Every PP woven bag and FIBC bulk bag we make is backed by a documented QA system, in-house testing, and internationally recognized certifications. Certificate numbers available on request.
Backed by 28 years of quality management and five internationally recognized certifications, the following apply to our manufacturing site and product range. As a certified PP woven and FIBC bag manufacturer, we apply these standards across every production line. Certificate numbers and audit dates are available on request.
Food-grade packaging site certification for dry food contact.
Quality management across weaving, lamination, printing and sewing.
Environmental management of production, waste and energy.
Occupational health and safety management.
From raw polypropylene resin to the finished bag, every stage is checked by our in-house QC team across 20+ production lines, so issues are caught on the line, not at the port.
Every batch of polypropylene raw materials is inspected before production to ensure stable quality, proper specifications, and consistent processing performance.
every batch of polypropylene tapes is inspected to ensure consistent strength, dimensions, and processing quality.
During weaving, fabric density, weaving consistency, and tape quality are continuously monitored to ensure strong and uniform woven fabric.
Each printed bag is inspected for color accuracy, artwork alignment, print clarity, and logo quality before entering the next production stage.
Before sewing, every cut fabric piece is inspected to ensure accurate dimensions, clean edges, and consistent quality.
Every bag is inspected after sewing to ensure strong seams, accurate dimensions, and reliable construction.
High-quality sewing threads help create strong and durable seams for reliable bag performance.
We check the quality and strength of webbing to ensure every FIBC bag can be safely handled and transported.
Each finished product is carefully checked before shipment to ensure it meets your requirements.
Products are packed according to customer requirements, with labels and packaging checked before shipment to ensure safe transportation.
Melt flow rate meter
Yarn Length Measuring Machine
Double Column Universal Material Testing Machine
Fabric Tensile Testing Machine
Single Column Electronic Tensile Testing Machine
For food applications, production follows BRCGS food-grade site requirements: segregated handling, controlled hygiene and clean packing.
BRCGS-certified
food-grade line for flour, sugar, salt, starch and dry food contact.
Lot traceability
from raw resin to finished batch for recall readiness.
Third-party inspection
supported: SGS, BV or buyer-appointed inspectors.
Across major B2B e-commerce platforms, Sitong's store maintains strong buyer ratings for product quality, communication and on-time delivery — a visible record of repeat orders from distributors and brand owners worldwide.
Reviewers highlight bag strength, print clarity and stable specifications across repeat orders.
Dedicated account reps respond quickly to quotes, samples and custom requirements.
Buyers confirm on-time production, clear documentation and dependable sea shipping.
Yes. BRCGS, ISO 9001/14001, OHSMS and the latest audit summary are available on request.
Key incoming materials are tested on arrival, and finished products are audited by random sampling per our QC plan. Full-test reports can be arranged for specific orders.
Our food-grade bags are produced under BRCGS food-grade site conditions for dry-food contact. Confirm your target market's food-packaging rules with our team before ordering.
Yes. Fabric GSM, tape denier and seam strength are adjustable to your filling equipment and load requirements.
Yes. We can arrange SGS, BV or buyer-appointed inspection at the plant or before container loading.
Yes. For OEM and private label projects, we can follow specific customer requirements regarding materials, dimensions, printing, structure, inspection standards, and packaging methods.
We will contact you within 1 working day, please pay attention to the email with the suffix “@hcstgroup.com“.
