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CSA B45.6-11 (R2016): Technical Requirements for Integral Plastic Water Closets, Flush Tanks and Bidets
Scope, Testing, and Compliance for Plastic Plumbing Fixtures in Canada
CSA B45.6-11 (R2016) is the Canadian standard that establishes minimum performance, material, and testing requirements for integral plastic water closets, flush tanks, and bidets – fixtures that combine the toilet bowl and tank into a single plastic unit or are individually molded from plastic. Reaffirmed in 2016 with no technical changes, this standard is a key component of the CSA B45 series on plumbing fixtures and works alongside the National Plumbing Code of Canada. It ensures that plastic fixtures used in residential and commercial buildings meet stringent criteria for dimensional accuracy, water efficiency, structural integrity, and long-term durability.
Scope and Purpose
CSA B45.6-11 applies to integral plastic water closets (one-piece bowl and tank), flush tanks that are separate from the bowl but made of plastic, and plastic bidets intended for sanitary use. The standard does not cover ceramic fixtures (addressed by CSA B45.1) or flushometer valve installations. Its primary purpose is to ensure that plastic fixtures provide a safe, reliable, and water-conserving solution suitable for the Canadian market. The standard references the performance requirements of ASME A112.19.2 for water closets and ASME A112.19.14 for bidets, adapting them to the specific characteristics of plastic materials such as acrylic, fiberglass-reinforced polyester, and polyethylene.
Note: The 2016 reaffirmation confirmed that the technical provisions remain current; therefore, manufacturers and specifiers should continue using the original 2011 wording and test criteria.
Technical Requirements and Testing
The standard imposes comprehensive requirements across materials, construction, water performance, and mechanical strength. Key technical provisions include:
Material and Construction
- Plastic composition: Must be thermoset or thermoplastic that is resistant to household chemicals, cleaning agents, and temperature extremes (up to 82 °C for hot water exposure).
- Surface finish: Smooth, non‑porous, and free of cracks, blisters, or defects. Colour must be uniform and stable under UV exposure (if intended for sunlight exposure).
- Dimensional tolerance: All critical dimensions (e.g., rough‑in height, trapway diameter, bolt spread) must comply with the values in ASME A112.19.2, with any deviations clearly specified in the manufacturer’s literature.
Water Performance and Efficiency
CSA B45.6-11 mandates maximum flush volumes and waste removal performance. The following table summarizes the primary water use requirements:
| Fixture Type | Maximum Flush Volume | Minimum Waste Removal | Test Method |
|---|---|---|---|
| Integral plastic water closet | 4.8 L (1.28 gpf) or 6.0 L (1.6 gpf) for older models | ≥ 100 g of simulated solid waste (test media) in a single flush | ASME A112.19.2 – Section 8 |
| Flush tank (separate) | As specified for the mating bowl (max 6.0 L) | N/A (tank only) | Leak test, fill valve performance |
| Plastic bidet | N/A (bidet uses a separate water supply) | N/A | Spray pattern, backflow prevention per ASSE 1016 |
Water Conservation: The standard’s 4.8 L maximum aligns with current WaterSense® and Canadian Code requirements. Older fixtures that met the 6.0 L limit are still permitted but may not qualify for water‑efficiency labeling.
Structural and Durability Testing
- Load test (seat and bowl): The fixture must withstand a 2250 N (500 lbf) static load applied to the seat area without cracking or permanent deflection exceeding 1.0 mm.
- Thermal shock: Alternating exposure to hot (82 °C) and cold (4 °C) water for 10 cycles with no evidence of crazing, warping, or leakage.
- Chemical resistance: Immersion in common household cleaning chemicals (e.g., dilute hydrochloric acid, bleach, ammonia) for 24 hours must not cause surface etching or colour change.
- Impact resistance: A 0.5 kg steel ball dropped from 300 mm must not cause fracture or permanent deformation.
Compliance and Certification
To market plastic water closets, flush tanks, or bidets in Canada, manufacturers must demonstrate compliance with CSA B45.6-11. The Canadian Standards Association (CSA Group) operates a product certification program that includes:
- Third‑party testing: Samples are tested at an accredited laboratory to all clauses of the standard.
- Factory inspection: Initial and periodic audits of the manufacturing facility to verify consistency in material quality and production processes.
- Marking and labeling: Each fixture must bear the manufacturer’s name or trademark, model number, date code, flush volume, and the CSA certification mark (e.g., cCSAus).
- Supplementary requirements: For fixtures sold in the United States, dual certification to the corresponding ASSE/ASME standard (e.g., ASME A112.19.2) may be required.
Important: The standard does not override local plumbing codes. Even with CSA certification, installers must verify that the fixture’s rough‑in dimensions and water consumption are accepted by the authority having jurisdiction (AHJ).
Implementation Highlights
Specifiers and engineers should consider the following when selecting plastic fixtures for a project:
- Material selection: Acrylic and fiberglass units offer lower weight and cost than ceramic, but may require more careful handling to avoid scratches.
- Retrofit applications: Plastic water closets are often used in modular housing or temporary facilities where weight savings are critical.
- Maintenance: Avoid abrasive cleaners that can dull the glossy finish. Refer to the manufacturer’s care instructions.
- Warranty: Look for products with a minimum 5‑year warranty against manufacturing defects (common in CSA‑certified fixtures).
Pro Tip: When comparing plastic units, request the manufacturer’s test report for thermal shock and chemical resistance. These are two common failure points in low‑quality imports.
CSA B45.6-11 also promotes harmonization with US standards. For example, the waste removal test and load requirements closely mirror those in ASME A112.19.2. This simplifies certification for companies that serve both the Canadian and American markets.
In summary, CSA B45.6-11 (R2016) provides a robust framework for ensuring that integral plastic water closets, flush tanks, and bidets deliver safe, efficient, and durable service. Compliance with this standard is essential for achieving regulatory approval under the National Plumbing Code of Canada and for earning consumer confidence in plastic fixture technology.
Frequently Asked Questions
Q: Does CSA B45.6-11 cover toilets with separate plastic flush tanks that are not integral to the bowl?
A: Yes. The standard applies to both integral (one‑piece) units and separate flush tanks made of plastic, as long as they are intended for use with a plastic or ceramic bowl. However, the bowl itself must be covered under the appropriate standard (e.g., CSA B45.1 for ceramic, or this standard for plastic).
A: Yes. The standard applies to both integral (one‑piece) units and separate flush tanks made of plastic, as long as they are intended for use with a plastic or ceramic bowl. However, the bowl itself must be covered under the appropriate standard (e.g., CSA B45.1 for ceramic, or this standard for plastic).
Q: How does the 2016 reaffirmation differ from the original 2011 edition?
A: The 2016 reaffirmation did not introduce any technical changes. It simply confirmed that the existing requirements remain valid. Any updates to water efficiency limits or testing protocols would appear in future revisions (e.g., a new edition). Manufacturers may continue using the 2011 version without modification.
A: The 2016 reaffirmation did not introduce any technical changes. It simply confirmed that the existing requirements remain valid. Any updates to water efficiency limits or testing protocols would appear in future revisions (e.g., a new edition). Manufacturers may continue using the 2011 version without modification.
Q: Can plastic water closets certified to CSA B45.6-11 be used in commercial bathrooms?
A: Yes, provided the fixture meets the load and durability requirements of the standard and is accepted by the local plumbing code. Many commercial applications (e.g., office buildings, schools) use plastic fixtures for their durability and ease of cleaning, though ceramic often remains the material of choice for heavy‑duty public restrooms.
A: Yes, provided the fixture meets the load and durability requirements of the standard and is accepted by the local plumbing code. Many commercial applications (e.g., office buildings, schools) use plastic fixtures for their durability and ease of cleaning, though ceramic often remains the material of choice for heavy‑duty public restrooms.
Q: Where can I find a list of CSA‑certified plastic water closets?
A: The CSA Group maintains an online certified product directory at
A: The CSA Group maintains an online certified product directory at
www.csagroup.org. You can search by standard number (B45.6‑11) or product category to identify compliant models.Last reviewed: 2026