Plastic Injection
We use a 1300‑ton injection molding process to form the backrest, seat, armrests, and base of every MSDA chair from PP, PA, and TPU materials.
Plastic Injection
We use a 1300‑ton injection molding process to form the backrest, seat, armrests, and base of every MSDA chair from PP, PA, and TPU materials.
Why Plastic Injection Matters
From the backrest frame of the UNO 663 to the five-star base under your seat, plastic injection molding shapes the parts that carry weight, absorb impact, and define the chair's look.
At MSDA, we use only virgin PP+GF—never recycled material—for our chair structures. With a 1300-ton clamping force, one of the highest in the industry, we mold large, complex, high-strength parts in a single shot. That means no assembly welds, no weak joints, and a stronger, more reliable chair overall.
Five Steps from Pellet to Part
Every plastic component follows MSDA's standardized 5-step injection process，from mold preparation and material dosing to final quality check，ensuring consistency across every batch.
Raw Materials
We never use recycled PP. Every PP part starts with virgin, glass-fiber-reinforced engineering resin—chosen for impact strength, dimensional stability, and long-term fatigue resistance.
PP+GF
Polypropylene + Glass Fiber
The mostly used materials of MSDA chairs, lightweight, dimensionally stable, and highly resistant to fatigue, ideal for large structural parts such as backrest frames.
Use: Backrest frames, seat shells, headrests, armrest tops
Feature:~30% cost saving vs. wood-frame alternatives
PA+GF
Nylon + Glass Fiber
A higher-strength, higher-heat engineering plastic. Used for parts that must withstand repeated impact and heavy static loads—especially five-star bases.
Use：Five-star bases, mechanical chassis covers, structural hubs
Feature:Higher impact strength and heat resistance than PP
TPU
Thermoplastic Polyurethane
A high-performance polymer that combines the elasticity of rubber with the processing advantages of plastics. TPU is softer and provides a "skin-like" tactile experience, making it a popular choice for ergonomic office chair 3D armrests.
Use：Armrests pads, elastic backrests
Feature: Rubber elasticity, skin like feeling
Quality Control
MSDA's testing program runs first-piece approval plus batch-level strength verification on injection parts. We don't just meet BIFMA, we build to a tighter internal standard.
1,300 kg static load on plastic bases ,max static load exceeds 1,400 kg (vs. BIFMA 1,136 kg) 120,000-cycle backrest durability test, 445 N pull force with 109 kg seat load 60,000-cycle armrest fatigue test at 400 N (10° from vertical) 300,000-cycle tilt mechanism endurance test with 109 kg seat load First-piece approval, BIFMA backrest push test and armrest horizontal pull test before every production batchFrequently Asked Questions
A: Adding glass fiber (GF) to polypropylene dramatically increases its stiffness, impact strength, and heat resistance—while keeping the part lightweight. For structural parts like backrests and bases, PP+GF gives us performance close to engineering plastics (such as PA) at a much lower cost. ABS is reserved for decorative parts where surface finish matters more than load.
A: Yes. We offer a wide color range (RAL or Pantone matching) and several surface textures—matte, satin, wood-grain, and fine leather-grain. Custom color or texture requests are subject to a small batch fee and longer lead time for color-master-batch preparation.
A: For standard parts using existing molds, MOQ starts at 100 pieces per color. For new molds, MOQ is typically 500–1,000 pieces to justify tooling cost. Our ERP system and in-house mold workshop let us quote and deliver small trial orders within 15–20 working days.
A: Yes. Our in-house mold workshop handles the full cycle—from 3D design review and DFM analysis to T0 sample production. We protect customer IP with strict confidentiality agreements and segregated mold storage. Typical mold lead time is 3-6 months for parts up to 1,300-ton clamp.
A: Every batch is run through a documented IPQC (In-Process Quality Control) checklist—including first-piece approval, in-cycle dimension sampling, and end-of-batch mechanical tests. We also retain production samples for traceability. All raw-material batches are accompanied by supplier certificates.
A: MSDA is ISO 9001 certified at the company level. Our plastic components are tested in the final chair product in accordance with BIFMA X5.1, EN 1335, and QB/T 2280-2016. Individual test reports can be provided per project.
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Feel free to let us know you needs for comercial seatings and we will choose most suitable products we have and send you a quote.
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Tel: 0086-750-8538 090
Fax: 0086-750-8312 000
E-mail: sales@msdaoffice.com
Add: No.3 Industrial Park, Hecheng Town, Heshan City, Guangdong Province, China.
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