PETROLEUM WAX, SYNTHETIC

CAS: 977045-73-0 MASTICATORY SUBSTANCE, SURFACE-ACTIVE AGENT

Petroleum Wax, Synthetic is a refined mixture of paraffinic hydrocarbons used in food applications under specified regulatory conditions.

What It Is

Petroleum Wax, Synthetic is a highly refined mixture of solid hydrocarbons that are paraffinic in nature and is characterized by a waxy solid state at typical ambient temperatures. It is recognized as a food additive in regulatory inventories, and the U.S. Food and Drug Administration (FDA) lists it for particular functional uses in food and food contact applications. As indicated in U.S. regulatory inventories, it can act as a masticatory substance in chewing gum and as a surface-active agent, among other technical functions in formulation or processing contexts. Its identification includes the Chemical Abstracts Service (CAS) number 977045-73-0 and multiple synonyms referring to synthetic paraffinic waxes that are prepared via polymerization and refining techniques, giving it physical properties suited for stability and protective purposes in specific food contexts. The precise physicochemical properties of the wax reflect its composition as a mixture of long-chain solid hydrocarbons that are generally inert under normal food use conditions, with minimal water solubility and a melting range dependent on the specific hydrocarbon chain distribution used in production. Regulatory codifications define its allowable applications and processing standards, including specifications related to purity and absorptive characteristics, to ensure consistency with functional and safety expectations in food-related uses.

How It Is Made

Synthetic petroleum wax is manufactured by catalytic polymerization of ethylene or by copolymerization of ethylene with linear alpha-olefins in the range of C3 to C12, followed by refining processes to yield a solid, paraffinic hydrocarbon wax mixture. The manufacturing sequence typically involves polymerizing the starting monomers in the presence of catalysts under controlled temperature and pressure conditions to form long hydrocarbon chains, which are then refined and treated to meet regulatory specifications for use in food-contact or food additive contexts. Refining may include steps to reduce impurities, control molecular weight distribution, and meet defined absorbance criteria for ultraviolet spectra, ensuring the material meets established regulatory limits for composition and performance. In addition to polymerization, the process may incorporate antioxidant additions that are permitted for food use in amounts necessary to achieve their intended technical effect, all in accordance with applicable regulations that govern composition and permitted additives. These refining criteria are codified in regulatory provisions that specify minimum molecular weight ranges and acceptable analytical characteristics that synthetic petroleum wax must meet to be considered compliant for its intended uses.

Why It Is Used In Food

Synthetic petroleum wax is used in certain food and food contact applications because its physical and chemical properties support specific technological functions that other substances may not provide as effectively. In chewing gum formulation, for example, it serves as a masticatory substance, contributing to the texture and chew characteristics that consumers expect, while being stable and inert under chewing conditions. As a surface-active agent or protective coating, the wax can impart a barrier property on food surfaces such as cheese or fresh produce, helping to reduce moisture loss and protect the product during handling and distribution. The wax’s inert hydrocarbon structure limits reactivity with food ingredients, making it suitable where non-reactive, stable materials are required. Additionally, as a defoamer in processing applications, synthetic petroleum wax may reduce foam formation in certain food manufacturing steps, facilitating processing efficiency. Its inclusion in specific regulations reflects these defined technological motivations and the regulatory recognition that, when used within prescribed limitations, the material can fulfill these functions without unacceptable effects on food quality or safety.

Adi Example Calculation

To illustrate the concept of acceptable daily intake (ADI) in general terms, consider a hypothetical food additive with an ADI of 20 milligrams per kilogram of body weight per day. For a person weighing 60 kilograms, this theoretical ADI would equate to 1,200 milligrams per day of that additive; however, petroleum-derived hydrocarbon waxes typically do not have a quantified numeric ADI established because safety evaluations and specifications describe their low toxicity profile when used under regulatory limitations. This example is provided solely to explain how ADIs are used in regulatory contexts and does not reflect a specific numeric authorization for synthetic petroleum wax itself.

Safety And Health Research

Safety evaluations of hydrocarbon waxes, including paraffin and related synthetic petroleum waxes, have been conducted by international expert committees that review toxicological, metabolic, and exposure data to inform specifications and risk assessments. For example, comprehensive reviews of microcrystalline and paraffin waxes have concluded that these substances exhibit low toxicity under specified conditions of use, with studies indicating limited absorption and metabolism when ingested as part of food-contact materials. International evaluations have recognized that the composition and long-chain hydrocarbon nature of these waxes generally result in minimal systemic exposure and that available long-term animal studies using wax-containing formulations did not yield significant adverse findings under test conditions. Regulatory safety assessments focus on ensuring that the wax composition, purity, and specified conditions of use do not present unacceptable risks to consumers, leading expert panels to describe certain hydrocarbon waxes with a group classification that reflects their low hazard potential. Nonetheless, the safety context is grounded in adherence to specifications that limit impurities and compositional variability, reinforcing that observed low toxicity in studies applies to food-grade materials produced and used in line with regulatory standards.

Regulatory Status Worldwide

In the United States, synthetic petroleum wax is included in the Code of Federal Regulations (CFR) under multiple provisions that define its permitted uses and conditions. The substance appears in direct food additive and indirect food additive sections of 21 CFR, including provisions that address its use in chewing gum as a masticatory substance, as a protective coating for produce and cheese, and in food contact applications under specified conditions of good manufacturing practice. Regulatory citations such as 21 CFR 172.888 provide identity and specification criteria that synthetic petroleum wax must meet for safe use in or on food, while other sections govern specific conditions for food contact substances and coatings incorporated into packaging and processing equipment. Outside the U.S., many jurisdictions reference harmonized food additive specifications or evaluate hydrocarbon waxes through international expert committees, though explicit authorizations may vary and should be consulted in respective regulatory frameworks. Codex Alimentarius and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) develop specifications and safety evaluations for broad classes of hydrocarbon waxes, allowing regulatory bodies to reference these international benchmarks in their own assessments and specifications.

Taste And Functional Properties

Synthetic petroleum wax is generally considered to have minimal sensory impact on food, as it consists of long-chain hydrocarbons that are largely tasteless and odorless at levels associated with its regulated use in food products. Because hydrocarbons in this class do not readily dissolve in water, their contribution to taste is minimal, and any residual sensory profile is typically neutral. Functionally, the wax exhibits solid-state consistency at ambient temperatures, which makes it useful where a firm, protective or structural function is needed, such as forming coatings on produce or contributing to the chew texture in gum. The wax’s hydrocarbon matrix also contributes to its thermal stability within the range of typical food processing and storage conditions, allowing it to maintain structure rather than flow or break down under moderate heat exposure. The functionality of synthetic petroleum wax derives from these physical properties, enabling it to act as a barrier, defoamer, or texture modifier depending on application. However, its low solubility in aqueous environments and limited chemical reactivity underscore its role as an inert physical agent rather than an ingredient that contributes to taste or flavor development.

Acceptable Daily Intake Explained

Regulatory evaluations of petroleum-derived hydrocarbon waxes often address the concept of an acceptable daily intake (ADI) to contextualize safety within estimated exposure levels, even if a numerical ADI is not established in some jurisdictions due to the low toxicity profile. An ADI represents an estimate of the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, typically expressed relative to body weight. For synthetic petroleum waxes and related hydrocarbon waxes evaluated by international committees, the specification-driven safety assessments and low toxicity support a characterization that does not necessitate a narrowly defined numeric ADI in certain contexts, instead focusing on meeting composition and purity criteria that ensure low risk when used as permitted. In regulatory practice, adherence to defined conditions of use and manufacturing specifications serves to limit consumer exposure in a manner consistent with safety evaluations, with the regulatory status reflecting a managed technical use rather than unrestricted consumption.

Comparison With Similar Additives

When comparing synthetic petroleum wax with other food-grade waxes, there are distinctions in origin and functional characteristics that influence their use. Natural waxes such as carnauba wax and candelilla wax are plant-derived and often used as glazing or coating agents where a hard, glossy finish is desired; these waxes have E-number designations in certain regions and are subject to their own regulatory specifications. Microcrystalline wax, another petroleum-derived wax class, exhibits differences in crystal structure and flexibility that can affect its application in texture or adhesion contexts compared with the more paraffinic synthetic petroleum wax. Beeswax, a natural animal-derived wax, has different compositional and functional traits, such as a lower melting range and distinct ester content, making it suitable for specialized applications like coatings and confectionery finishes. Each of these waxes shares the common role of providing physical properties like barrier formation or texture modification, yet they are selected based on regulatory status, performance criteria, and formulation needs in specific food applications.

Common Food Applications Narrative

In the context of food manufacturing and food contact applications, synthetic petroleum wax is incorporated into a range of products where its physical properties support functional requirements without direct impact on flavor or nutritional content. For instance, in chewing gum bases, this synthetic hydrocarbon wax contributes to the desirable chew characteristics by providing a stable, non-digestible matrix that interacts with other base components to establish texture. Similarly, protective coatings on certain cheeses and fresh fruits leverage the wax’s barrier properties, helping to retain moisture and maintain surface integrity during storage and distribution. In food processing, synthetic petroleum wax may be used where defoaming or surface finishing is necessary, such as in the production of certain confectionery or manufacture of packaging materials that come into contact with food. The applications of this wax align with consumer expectations for products that retain quality, texture, and appearance over time, supporting extended shelf life and product handling stability. While consumers may not recognize the wax by name on ingredient lists, its contribution to product performance can be significant in these specified roles when used according to regulatory allowances and manufacturing practices.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 172.888

EFSA

  • Notes: EFSA authorization and ADI details not sourced

JECFA

  • Notes: JECFA numeric ADI not available in sourced material

Sources

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