100+ Free IICRC SMT Practice Questions
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Colorant or color-sealing of grout differs from standard sealing in that it:
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Key Facts: IICRC SMT Exam
~80 MC
Exam Questions
IICRC SMT
75%
Passing Score
IICRC SMT
$80
Exam Fee
IICRC (plus course tuition)
45 days
Online Exam Window
IICRC online testing
20-40 hrs
Recommended Study Time
Estimate
7
Topic Areas
IICRC SMT outline
As of 2026-05-13, the IICRC SMT (Stone, Masonry and Ceramic Tile Cleaning Technician) is a professional cleaning credential covering natural and cultured stone, ceramic/porcelain tile, and grout. The exam has approximately 80 multiple-choice questions with a 75% passing score and an $80 exam fee, delivered online during a 45-day window after course completion or in person at end-of-class. Core content: stone identification (calcareous marble/limestone/travertine vs. siliceous granite/slate/quartzite/sandstone), stone characteristics (porosity, Mohs hardness, acid sensitivity, finishes), tile and grout (ceramic vs. porcelain, cement vs. epoxy grout, color sealing), cleaning chemistry (pH, surfactants, chelants, dwell times — no acids on calcareous stone), soil-removal methods (rotary scrub, extraction, vapor steam, low/high-pressure rinse), restoration (diamond honing/polishing pad progressions, lippage removal, crystallization, powder polishing, scratch repair), and sealers (impregnating vs. topical, fluoropolymer vs. siloxane, application and maintenance). Administered by the IICRC (iicrc.org/smt).
Sample IICRC SMT Practice Questions
Try these sample questions to test your IICRC SMT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which of the following stones is classified as calcareous?
2A technician applies a few drops of dilute hydrochloric acid to an unknown stone and observes vigorous effervescence. The stone is most likely:
3Travertine is best characterized as:
4Which mineral composition is characteristic of granite?
5Marble is geologically classified as:
6Which of the following is a key visual indicator that helps identify slate?
7Cultured (cast) stone differs from natural stone in that it is:
8Sandstone is best described as:
9Quartzite is distinguished from sandstone primarily by:
10Which group correctly lists only calcareous stones?
About the IICRC SMT Exam
The IICRC SMT (Stone, Masonry and Ceramic Tile Cleaning Technician) is a professional cleaning certification covering natural and cultured stone, ceramic and porcelain tile, and grout. Candidates must distinguish calcareous stone (marble, limestone, travertine) from siliceous stone (granite, slate, quartzite, sandstone) and select cleaning chemistry by pH and substrate compatibility. The exam tests cleaning methods (extraction, vapor, rotary, low/high-pressure rinse) and stone restoration — diamond honing and polishing pad progressions, lippage removal, crystallization, and powder polishing. Sealer chemistry (impregnating vs. topical, fluoropolymer vs. siloxane) and grout color sealing round out the scope.
Assessment
~80 MC questions, single best answer, computer-delivered
Time Limit
45-day online window
Passing Score
75%
Exam Fee
$80 (plus course tuition) (IICRC)
IICRC SMT Exam Content Outline
Stone Identification
Calcareous vs. siliceous, igneous/sedimentary/metamorphic, marble, limestone, travertine, granite, slate, quartzite, sandstone, terrazzo, engineered and cultured stone
Stone Characteristics
Porosity, absorption, Mohs hardness, acid sensitivity, finishes (polished/honed/flamed/tumbled), spalling, efflorescence, picture framing, reactivity
Tile & Grout
Ceramic vs. porcelain (through-body vs. glazed), cement-based vs. epoxy grout, color sealing, haze removal, ANSI tile standards overview, installation defects
Cleaning Chemistry
pH scale, acidic vs. alkaline cleaners, surfactants, solvents, chelants, neutralizing rinses, dwell times, dilution, substrate compatibility, test patches
Methods
Pre-vacuum, pre-spray, rotary scrub, truckmount and self-contained extraction, vapor steam, low/high-pressure rinse, dust-free dry blasting, post-vacuum
Restoration
Diamond honing and polishing pad progressions, lippage removal, crystallization, powder polishing, scratch repair, grout color sealing/coloring, refinishing
Sealers
Impregnating (penetrating) vs. topical sealers, solvent- vs. water-based, fluoropolymer vs. siloxane chemistry, application, curing, maintenance, stripping
How to Pass the IICRC SMT Exam
What You Need to Know
- Passing score: 75%
- Assessment: ~80 MC questions, single best answer, computer-delivered
- Time limit: 45-day online window
- Exam fee: $80 (plus course tuition)
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
IICRC SMT Study Tips from Top Performers
Frequently Asked Questions
What is the IICRC SMT certification?
The IICRC Stone, Masonry and Ceramic Tile Cleaning Technician (SMT) is a professional cleaning certification from the IICRC for technicians who clean, restore, and seal natural stone, masonry, ceramic and porcelain tile, and grout. It covers stone identification (calcareous vs. siliceous), cleaning chemistry safety, soil-removal methods, restoration via diamond honing and polishing pad progressions, and impregnating vs. topical sealer selection. SMT is administered by IICRC-approved schools.
How hard is the IICRC SMT exam?
SMT is considered moderate difficulty. The exam has approximately 80 multiple-choice questions with a 75% passing score. Most candidates plan 20-40 hours of focused preparation in addition to an IICRC-approved 2-3 day course. The most commonly missed topics tend to be the calcareous-vs-siliceous distinction and which cleaning chemistries are safe on each, diamond pad progressions (sequence and grit), and impregnating vs. topical sealer chemistry and maintenance.
How much does the IICRC SMT exam cost?
The IICRC SMT exam fee is $80. In addition, candidates typically complete an IICRC-approved SMT course before sitting the exam — course tuition varies by approved school but generally adds several hundred to roughly one thousand dollars for the 2-3 day course. Total program cost commonly falls in the $400-$1,000 range depending on provider and location.
Why is the calcareous vs. siliceous distinction so important on the SMT exam?
Calcareous stones (marble, limestone, travertine, onyx) are calcium carbonate based and react chemically with acids — even mild acidic cleaners etch the finish, causing dull spots and permanent damage. Siliceous stones (granite, slate, quartzite, sandstone) are silica based and tolerate acidic cleaners much better. SMT candidates must reliably identify the stone type and then select pH-appropriate chemistry; using an acid on marble is a textbook exam wrong-answer and a real-world job-loss event.
What is the difference between impregnating and topical sealers?
Impregnating (penetrating) sealers — typically fluoropolymer or siloxane chemistry — soak into the stone and bond within the pores to reduce absorption while leaving the surface and natural finish unchanged. Topical sealers form a film on the surface and produce a visible sheen but can wear, scratch, peel, and trap moisture. SMT technicians most often use impregnating sealers on natural stone; topical sealers are typical for concrete, terrazzo, or specific tile/grout applications where a film is desired.
How long do I have to take the SMT exam after my course?
The standard pathway is a 45-day online testing window following completion of an IICRC-approved SMT course; many candidates also take the proctored exam in person at the end of the class. Confirm format and deadline with the specific IICRC-approved school you choose.