Class Code 1438
Smelting, Sintering, Refining Or Alloying
Class 1438 covers employers whose primary operations involve smelting, sintering, refining or alloying metals and metal powders. This work carries a September 1, 2026 approved pure premium rate of $4.888 per $100 of payroll, reflecting the high thermal, chemical and mechanical hazards in these operations.
What Class Code 1438 Covers
This classification applies to processes that melt, chemically refine, sinter or combine base metals into alloys or finished metal products. Typical operations include primary smelting of ores, induction or electric-arc furnace melting, sintering of powdered metals, fluxing and slag removal, chemical refining and alloy charging and tapping. It covers operators who control furnaces and sinter presses, workers who handle ladles and pouring, technicians who sample and chemically analyze melts, and maintenance staff working on high-temperature equipment. Ancillary tasks integral to these processes — such as flux mixing, slag handling, crucible cleaning, and refractory work inside furnaces — are included when performed by the employer.
Who It Applies To
- Primary metal smelters (copper, lead, zinc, etc.)
- Nonferrous metal refineries and alloy manufacturers (brass, bronze, specialty alloys)
- Powder metallurgy and sintering plants producing sintered parts
- Melting and pouring crews working with induction or arc furnaces
- Maintenance technicians servicing furnaces, ladles, and refractory linings
Common Job Duties
- Operating and charging induction, arc, or reverberatory furnaces
- Pouring and transferring molten metal with ladles and torches
- Sintering powdered metal in presses and sintering furnaces
- Sampling molten metal and performing metallurgical analysis
- Removing slag, fluxing, and refining molten metal chemistry
- Cleaning and repairing refractory linings and furnace components
Common Injury Risks
Understanding the $4.888 Rate
The pure premium rate of $4.888 per $100 of payroll is the baseline cost the WCIRB assigns for the expected claim cost for this class. To estimate premium, multiply payroll for employees in this class by the rate and divide by 100; that yields the base workers' comp charge before insurer adjustments. Final premium is affected by your employer experience modification, policy-level credits or debits, deductible programs, classification accuracy, and state assessments or payroll taxes.
Cal/OSHA Compliance Requirements
California employers in smelting and refining must maintain a written Injury and Illness Prevention Program (IIPP) and comply with Hazard Communication and respiratory protection requirements for metal fumes and gases. Employers should implement local exhaust ventilation, respiratory programs with fit testing, permit-required confined space procedures for furnace and ladle entries, lockout/tagout for maintenance, heat illness prevention and documented training for molten metal handling and PPE.
How Key HR Helps Employers Under Class Code 1438
A PEO like Key HR helps employers in Class 1438 by ensuring accurate payroll classification, providing targeted loss-control programs (PPE, respirator fit testing, confined-space procedures), and managing claims and return-to-work plans to reduce experience modification impact. Key HR also centralizes OSHA recordkeeping, delivers site-specific safety training, and leverages pooled purchasing and risk management services to help contain workers' comp costs across high-hazard metal operations.
Get a QuoteFrequently Asked Questions
How do I know if my workers belong in Class 1438 or a different metalworking class?
Class 1438 applies when the employer's primary operation is melting, sintering, refining or alloying metals. If the work is limited to machining, molding, or foundry molding separate from melting operations, different WCIRB codes may apply. A payroll review and job-task audit will determine the correct classification.
What are the most effective controls to reduce injuries and insurance costs for smelting/refining operations?
Engineering controls such as local exhaust ventilation, automated pouring and remote handling, thermal shields, and moisture control in charge materials reduce incidents. Robust PPE, respirator programs, confined-space permits, preventative maintenance and a formal return-to-work program also lower claim frequency and severity, improving premiums over time.
Will maintenance staff working inside furnaces be charged under Class 1438?
If maintenance employees routinely enter, clean or repair furnaces, ladles or other high-temperature equipment as part of the employer's core operations, their payroll is typically assigned to Class 1438. Separate administrative or office staff should be classified to their appropriate, lower-risk codes.
Quick Facts
- Class Code
- 1438
- Classification
- Smelting, Sintering, Refining Or Alloying
- Pure Premium Rate
- $4.888 / $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 1438?
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