Quality Control
How do we do the quality control ?
Quality Control & Compliance for Nail Polish Bottle Manufacturing
At GH Plastic Manufacturing, quality control is not a final inspection step—it is integrated into every stage of our nail polish bottle production process. With three full-time QC specialists in a ten-person team, quality inspection represents 30% of our workforce. This structure ensures that every glass nail polish bottle, cap, and brush assembly is verified through process control rather than end-stage inspection alone.
International Quality Standards You Can Rely On
Our manufacturing and inspection systems are built to meet the requirements of global cosmetic packaging markets, including Europe and the United States.
Glass Nail Polish Bottles
● SGS third-party inspection certified
● FSSC food safety management system certified
● ISO 9001:2015 cerified (valid 6 Oct 2025 - 6 Oct 2028)
These standards ensure consistent bottle dimensions, durability, and production stability across every batch. including three specialists serving international export accounts.
PP Plastic Caps for Nail Polish Bottles
● EU REACH SVHC Declaration compliant
● RoHS compliant (Directive (EU) 2015/863)
● FDA 21 CFR 177.1520(c) 3.1a compliant (polypropylene food-contact standard)
● SGS Certificate No. ETR25206074 (12-Mar-2025)
● TÜV independent verification
● Matte black and matte white variants independently REACH verified
These certifications ensure safe, stable, and regulation-ready components for global cosmetic markets.
Full Documentation for Supplier Qualification
We provide complete documentation support to simplify procurement approval and audit processes:
● MSDS(Material Safety Data Sheets)
● COA (Certificate of Analysis)
● SGS, TÜV, ISO, REACH, RoHS, FDA compliance documents available upon request
Our documentation package is designed to meet the requirements of EU and US procurement teams and reduce supplier onboarding time.
Built for Faster Approval & Global Supply Chains
For European buyers, our compliance system aligns with REACH, RoHS, SVHC, SGS, and TÜV requirements from the outset.
For US buyers, FDA 21 CFR compliance for polypropylene materials is already verified and ready for submission during qualification.
This ensures faster internal approval, fewer compliance delays, and a smoother transition from sampling to mass production for nail polish bottle projects.
Incoming Check of Raw Material of Nail Polish Plastic Cap
PP or PE suppliers will provide the test report for each batch of incoming raw materials.
Nail Polish Plastic Caps Checking on Production
The nail polish plastic caps are produced by automatic injection machine equipped with computer and auto arm. All the production parameters are set by the computer. We check the nail polish caps on the conveyor after the auto arm picked up the plastic caps from the mold and placed them on the conveyor. The NG caps will be returned to the mixer for re-production. The qualified nail polish caps are going down to the basket slowly to avoid scratch among the nail polish plastic caps before packaging.
Nail Polish Plastic Caps Packaging Checking
The qualified nail polish caps are put in the polybag in the basket for packaging. 500 pcs of nail polish caps are packed in a polybag and 8 or 10 bags are in a carton, after bags are weighed and sealed. The product label with part number, quantity, and production date will be put on each carton.
Assembled Nail Polish Plastic Caps and Brushes
We can fit the brush into the plastic cap by tool machine for the customer (optional). The attached nail polish caps and brushes are placed on trays after visual inspection.
Nail Polish Brush Checking
The nail polish brushes are produced by automatic machine. All the production parameters are set by the computer. The nail polish brushes are visual inspected on the baskets or trays. 1000 pcs of nail polish brushes are packed in a polybag and 10 or 15 bags are packed in a carton, after bags are weighed and sealed. The product label with part number, quantity, and production date will be put on each carton.
Nail Polish Glass Bottles Checking on Production Process
The Nail Polish Glass Bottles are produced by the molds on automatic machines. All the production parameters are set by the computer. The nail polish glass bottles are visual inspected on process, before packed in the carton with partitions. The COA report of nail polish glass bottles will be provided by the glass factory, and we will inspect the nail polish glass bottles again before shipment.
Checking the dimensions of Gel Nail Polish Glass Bottles by Meter
We use Mitutoyo digital meter to check the dimensions of glass bottles (width, length, deepth, height, diameter, and neck size, etc.) to make sure the perfect shape of the bottles before shipment.
NG Nail Polish Glass Bottles
We sort out the NG bottles such as bottles with black spot, crack, bubble, scratch line on bottle surface, bottle neck not straight, or bottles with burr, etc. We put the NG bottles in the bag and send them back to the glass factories.
Packaging Process of the Empty Nail Polish Bottles
The nail polish glass bottles are packed on wrap trays, or in the carton with partitions or cross partitions, and all the cartons of nail polish glass bottles, plastic caps, and brushes are put on the pallets for shipment.
When Something Goes Wrong, You Need a Supplier Who Already Has an Answer
Every procurement manager sourcing packaging from overseas understands the concern: A container arrives damaged, caps do not fit correctly, or brushes shed during application. The key question is not whether problems can happen, but whether your supplier responds quickly and effectively when they do.
At GH Plastic Manufacturing, our after-sales service is built on a simple principle: customers should never struggle for a solution. With three dedicated export sales representatives managing international accounts and half of our team focused directly on customer support is not an afterthought—it is a core part of our business.
Our Replacement Policy: What Actually Happens When There Is a Problem
We do not ask buyers to navigate a bureaucratic returns process during a quality dispute. Here is exactly what happens in each scenario:
Glass Bottles: Confirmed Quality Defect
If a batch of glass bottles arrives with a verifiable defect, we ship replacement bottles directly to you. You are not required to return the defective units.
For situations where only a small number of bottles are affected within a larger shipment, we carry the replacement quantity forward into your next order at no additional charge.
Caps and Brushes: Defective Units
For cap and brush components, we ask that defective items be returned to our factory in Taiwan for inspection. Upon receipt, replacement caps and brushes are dispatched promptly.
We also include spare bottles, caps, and brushes with every outgoing shipment as a standard buffer, helping to minimize the impact of isolated defects on your production schedule.
Nail Polish Bottles, Caps, and Brushes QC Flow Chart
