Class Code 4499
Plastics – Thermoformed Products Mfg
Class Code 4499 covers manufacturers that form plastic sheet into finished parts by heating and shaping (vacuum forming, pressure forming, drape and matched‑mold forming). The approved California pure premium rate is $5.631 per $100 of payroll — a base measure insurers use to price workers' comp for these operations.
What Class Code 4499 Covers
This classification applies to shops and factories that convert thermoplastic sheets (PET, PVC, ABS, polycarbonate, polypropylene) into products through heating and forming processes rather than injection or extrusion molding. Included operations are sheet loading, heating in ovens, forming on molds (vacuum or pressure), trimming or routing of formed parts, die cutting, secondary machining or ultrasonic welding, and packaging of completed parts. The code covers manufacturing of displays, food and medical packaging, liners and housings, appliance and automotive components, and point‑of‑purchase products made primarily by thermoforming. Facilities with in‑line post‑processing — printing, adhesive application, assembly, or sterile packaging — are also commonly classified here when the primary operation is thermoforming.
Who It Applies To
- Vacuum and pressure forming shops that heat and form plastic sheet
- Manufacturers of thermoformed food, medical, or blister packaging
- Producers of point‑of‑purchase displays, automotive trim, and appliance liners
- Small batch fabricators doing CNC or handheld trimming of formed parts
- Companies doing matched‑mold or drape forming for signage and enclosures
- Thermoforming shops with inline assembly, printing, or packaging operations
Common Job Duties
- Feeding and positioning large plastic sheets into heating ovens or presses
- Operating vacuum/pressure forming machines and adjusting temperature and draw controls
- Trimming and finishing formed parts using routers, band saws, hand knives, or CNC routers
- Die cutting, trimming, sanding, and deburring edges of thermoplastic parts
- Ultrasonic welding, adhesive bonding, or snap‑fit assembly of formed components
- Quality inspection, measuring formed parts, and rejecting or reworking defects
- Packaging, palletizing, and preparing thermoformed components for shipment
Common Injury Risks
Understanding the $5.631 Rate
The pure premium rate of $5.631 per $100 of payroll is the WCIRB‑approved base cost for expected losses in this classification; insurers multiply that rate by your payroll (divided by 100) to calculate the base premium. Your final premium will vary based on your insurer's rate modifiers: experience modification, deductible or captive use, schedule credits, payroll splits among classes, and any state assessments or policy fees.
Cal/OSHA Compliance Requirements
Cal/OSHA requirements commonly relevant to thermoforming shops include comprehensive Hazard Communication (chemical labeling and SDS access), machine guarding and lockout/tagout programs for presses and routers, and written respiratory protection programs where fume exposures exceed PELs. Employers must also maintain an Injury and Illness Prevention Program (IIPP), provide training on hot‑work and PPE, control heat hazards around ovens, and implement local exhaust ventilation and monitoring for VOCs or styrene when used.
How Key HR Helps Employers Under Class Code 4499
A PEO like Key HR helps thermoforming employers by bundling workers' comp administration with proactive loss‑control services: on‑site safety assessments, tailored machine‑guarding and ventilation recommendations, safety training for hot‑work and trimming operations, and focused return‑to‑work programs to limit claim costs. Key HR also manages claims reporting and experience modification strategies and can provide access to pooled purchasing power and program credits that may reduce overall comp spend.
Get a QuoteFrequently Asked Questions
How do I know if my operation belongs in Class Code 4499 or a different plastics code?
Use the primary process test: if your business primarily heats and forms plastic sheet into parts (vacuum/pressure/drape/matched‑mold forming) and the bulk of payroll supports that activity, 4499 is appropriate. If your operation primarily uses injection molding, extrusion, or blow molding, a different code applies. Provide your insurer or Key HR with process descriptions, equipment lists, and payroll splits so they can verify classification.
What practical controls reduce respiratory and fume hazards in thermoforming?
Install local exhaust ventilation at oven and forming stations, use source capture on trimming equipment, substitute lower‑emitting resins where possible, implement air monitoring, and maintain a written respiratory protection program with fit testing when exposures exceed Cal/OSHA PELs. Label chemicals, keep current SDSs, and train staff on spill and solvent handling procedures.
How can I lower my workers' comp premium for a thermoforming shop?
Reduce recorded losses and severity through machine guarding, lockout/tagout, rout‑level PPE and training for cutters and welders, formalized light‑duty return‑to‑work plans, and ergonomic controls for sheet handling. Accurate payroll classification and prompt claims reporting also protect your experience modification. A PEO like Key HR can implement these programs, conduct loss‑control visits, and help document improvements that insurers consider when setting rates.
Quick Facts
- Class Code
- 4499
- Classification
- Plastics – Thermoformed Products Mfg
- Pure Premium Rate
- $5.631 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
Manage Workers' Comp Through a PEO
Key HR provides pay-as-you-go workers' comp for California employers — no large deposits, no audits, better rates.
Get a Quoteor call (800) 922-4133Ready to Simplify Workers' Comp for Class Code 4499?
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