Try the full study dashboard free, no signup: practice, flashcards and your Exam Readiness Score. Open it →
ABYCExamPrep
Start free
Home / Practice tests / ACMA CCT Vacuum Infusion
Composites · Last updated November 2026

ACMA Certified Composites Technician, Vacuum Infusion (CCT-VIP): free practice test

ACMA's credential for technicians working with vacuum infusion and related closed molding. The 100-question exam covers nine modules, led by tooling, resin flow theory and the VIP molding process at 15% each. This prep covers the written exam only. Candidates have one year from enrollment to test.

Start the free 15-question testRead the study guide

Watch the free 4:20 video lesson: the key ACMA CCT Vacuum Infusion concepts →

Premium: 3,000 practice questions, 6 full mock exams, 800 flashcards and 60 comprehensive key notes, topic by topic. See the study path ·

Or open the free ACMA CCT Vacuum Infusion study dashboard: flashcards, notes and your Readiness Score, no signup →

About the ACMA CCT Vacuum Infusion exam

ACMA's credential for technicians working with vacuum infusion and related closed molding. The 100-question exam covers nine modules, led by tooling, resin flow theory and the VIP molding process at 15% each. This prep covers the written exam only. Candidates have one year from enrollment to test.

What's on the exam

ACMA CCT Vacuum Infusion
General Composites Knowledge
8 key facts
Tooling for VIP and Closed Molding
7 key facts
Understanding Vacuum and Pressure
8 key facts
Resin Flow Theory
8 key facts
Vacuum Bag Configuration and Fabrication
8 key facts
VIP Molding Process
8 key facts
Light RTM and Molded Components
7 key facts
Closed Mold Quality Control
7 key facts

Each branch is a topic in the official outline. Members see every key fact on the full mind map. Read the free study guide →

How to pass the ACMA CCT Vacuum Infusion exam

  • 100 questions in 2 hours is 72 seconds each, and the exam cannot be paused. Start only when you have two uninterrupted hours and a stable connection.
  • Learn Darcy's Law as relationships: fill time rises with viscosity and the square of flow length, and falls with permeability and pressure difference.
  • Be able to convert a vacuum gauge reading to absolute pressure and psi. Atmospheric pressure is the ceiling on what infusion can do.
  • Basic Composites content is tested across every CCT program, so study the Basic Composites Manual alongside the VIP Study Guide.

Save your results and get your Readiness Score

Create a free account after the test: your score by topic, a mistakes bank, the complete study notes for the first topic, flashcards and the ABYC Numbers & Formulas Sheet.

Take the test first

What's in the premium ACMA CCT Vacuum Infusion prep

Premium ACMA CCT Vacuum Infusion prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.

3,000practice questions, every answer explained
6full-length mock exams, 100 questions each, timed
800flashcards with spaced repetition, sorted by topic
60comprehensive key notes across 8 topics

Your step-by-step study path

  1. 1
    General Composites Knowledge8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Notes free with an account
  2. 2
    Tooling for VIP and Closed Molding8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  3. 3
    Understanding Vacuum and Pressure8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  4. 4
    Resin Flow Theory8 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  5. 5
    Vacuum Bag Configuration and Fabrication7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  6. 6
    VIP Molding Process7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  7. 7
    Light RTM and Molded Components7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  8. 8
    Closed Mold Quality Control7 key notes, 100 flashcards, then 375 practice questions in 15 sets of 25
    Premium
  9. Final step: 6 full mock exams100 questions each, timed like test day. Pass them, then book your exam.
    Premium
Free with an account

Read the complete ACMA CCT Vacuum Infusion study notes for “General Composites Knowledge”

Our first full set of comprehensive notes, about 15 minutes of reading: Industry basics · Materials and matrix · Manufacturing process options · Why choose VIP · Safety essentials, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.

Open the free dashboard

Study tools included

3,000 practice questions

3,000 exam-style questions per exam, organized topic by topic in sets of 25. Every answer explained, with the rule it comes from.

6 full mock exams

6 full-length timed mock exams per exam, with real question counts and time limits, so test day feels like practice day.

Exam Readiness Score

One 0 to 100 number that tells you when you're ready to book. Reach 80 and you're covered by our Pass Guarantee.

800 flashcards + spaced repetition

800 flashcards per exam, in a deck for each topic, that come back right before you'd forget them. Five minutes a day keeps every number fresh.

60 comprehensive key notes

60 key notes per exam, split across its topics and each explained in full: the concepts, worked exam examples, the traps examiners use and a quick recap. Your first set is free with an account.

Mind maps

See the whole exam on one screen: every topic and the facts under it.

Sample questions with answers

These are the questions in the free test above, with answers. Try the test first. You'll learn more by getting some wrong.

1. A boat builder moves a hull from open hand lay-up to vacuum infusion, using suitable reinforcements. Which pair of changes should the builder expect?
Answer: Higher fiber content and lower styrene emissions in the shop. Vacuum compaction packs the fibers tightly, raising fiber content, and the closed bag keeps most styrene from escaping during wet-out. In exchange, setup takes longer and the tool must hold vacuum. Hand lay-up relies on rollers alone, so its laminates are more resin-rich and more dependent on operator skill.
2. A new FRP infusion tool keeps failing vacuum checks. The bag and sealant tape test good on a separate glass plate, and the leak is traced to the tool surface itself. What is the correct response?
Answer: Find and seal the porosity so that the tool holds vacuum by itself. An infusion tool is half of the vacuum envelope, so it must be airtight. Air drawn through a porous tool enters the laminate as bubbles even if a bigger pump keeps the gauge up. Repair the tool and retest it before production, because a leak under the part cannot be found during a run.
3. A shop infuses 30 identical parts per month and is spending heavily on disposable bagging film and labor to build each bag. Which tooling change most directly addresses this?
Answer: A reusable B-side, such as a silicone membrane or a matched mold. Repeat production justifies a reusable B-side: a silicone membrane, closed cavity bag or Light RTM counter mold replaces disposable film and removes much of the bagging labor. Thicker film still gets discarded after each part. The higher tool cost is repaid across the number of parts made.
4. At sea level, with atmospheric pressure of 29.92 inHg (14.7 psi), a gauge on the bag reads 25 inHg of vacuum. What pressure difference is acting across the bag?
Answer: 12.3 psi. 25 / 29.92 x 14.7 psi = 12.3 psi. The absolute pressure inside the bag is 29.92 - 25 = 4.92 inHg, and 4.9 is that number misread as psi. Infusion can never exceed one atmosphere of driving pressure, and that ceiling falls with altitude.
5. During an infusion with a styrene-based polyester, the pump is at its deepest possible vacuum, and fine bubbles form in resin moving through the laminate although the bag has no leaks. What is the most likely cause and response?
Answer: Styrene is boiling off; reduce vacuum to the supplier's limit. Under deep vacuum the absolute pressure can approach the vapor pressure of styrene, so the monomer boils and creates voids. Once the bag has passed its leak check, set the vacuum to the level the resin supplier allows. Epoxies without volatile monomers are less affected, although dissolved air can still come out of any resin.
6. An infusion at constant vacuum takes 20 minutes for resin to travel 1 meter through a reinforcement stack. With no other changes, about how long would the flow front need to travel 2 meters?
Answer: 80 minutes. With a fixed pressure difference, Darcy flow slows as the wetted length grows, so fill time rises with the square of distance. Doubling distance gives 2 x 2 = 4 times the time, or 80 minutes. Answering 40 minutes assumes constant speed, which is the classic error when planning feed lines.
7. An infusion is filling too slowly. Assuming the other factors stay the same, which single change would shorten fill time the most?
Answer: Halving the flow distance by adding a central feed line. Fill time varies with viscosity and the square of flow length, and inversely with permeability and pressure difference. Halving the distance cuts time to a quarter, while halving viscosity or doubling permeability only halves it. Going from 26 to 28 inHg adds under 10%, which is why feed line layout is the strongest lever.
8. Resin races along the edge of the mold and reaches the vent line, leaving a dry area in the center of the part. What is the most likely cause, and what is the fix for the next part?
Answer: Race-tracking through a gap; fit the stack tightly at the edges. Resin takes the path of least resistance, so a gap between the stack and the mold edge becomes a fast channel that reaches the vent first and cuts off vacuum to the center. Trim and fit the reinforcements closely, and control where flow media stops. A longer gel time would not fix the route the resin is taking.
9. A bagged part is isolated from the pump for a drop test. The shop's limit is a loss of 1 inHg in 5 minutes, but the gauge falls 3 inHg in 5 minutes. What should the technician do next?
Answer: Locate and repair the leak, and repeat the test before mixing resin. A failed drop test means air can enter the laminate during infusion, causing voids or dry areas. Check sealant tape joins, pleats, ports and fittings, often with an ultrasonic detector or by listening, then retest. A running pump can hold the gauge while air still flows through the part, so the gauge alone proves little.
10. On a mold with a tight inside corner, the cured part shows a resin-rich, thick radius where the film stood off from the reinforcement during drawdown. What should have been done when bagging?
Answer: Include enough extra film and pleats for the bag to reach the corner. This is bridging: a bag without enough slack spans an inside corner, leaving a cavity that fills with resin. Add surplus film and pleats so the bag conforms under vacuum, then work it into the radius during drawdown. Pulling the film tight makes bridging worse, and extra media gives resin another channel.
11. A part uses 6 plies of 800 g/m² glass fabric over 3 m². If the target is 65% glass by weight, how much resin will end up in the laminate?
Answer: 7.8 kg. Glass weight is 6 x 0.8 kg/m² x 3 m² = 14.4 kg. If glass is 65% of the total, resin is 14.4 x 35 / 65 = 7.8 kg. The figure of 9.4 kg is 65% of the glass weight, a common slip. Mix extra to cover feed lines, flow media and any core grooves.
12. The flow front has reached the vent and the part appears fully wet. What is the normal next step in the VIP sequence?
Answer: Clamp the resin feed and hold vacuum on the vent until the resin gels. Clamping the feed stops more resin entering, and holding vacuum keeps the laminate compacted while pressure evens out and the resin gels. Releasing vacuum early lets the stack relax and can draw in air. Leaving the feed open keeps pulling resin through, wasting material and risking resin in the vacuum system.
13. During a Light RTM fill with the perimeter flange held under vacuum, the center of the semi-rigid B-side starts to lift. What adjustment should be made first?
Answer: Reduce the injection pressure so cavity pressure stays below clamping. Atmospheric pressure acting through the flange vacuum clamps the mold, so cavity pressure must stay below that clamping force. Light RTM injection is generally kept under about 1 bar with a vacuum-assisted cavity. Raising pressure or reducing flange vacuum makes the lift worse and can change part thickness.
14. A shop's new preforms use a much heavier binder application than before. Fill times have increased and some dry spots appear in the same resin and tooling. What is the most likely reason?
Answer: The binder has reduced the permeability of the reinforcement stack. Binder holds a preform in shape, but it also blocks pore space and sticks fibers together, which reduces permeability. Lower permeability slows the flow and can leave dry spots if resin gels first. Keep binder to the amount needed, and check that it is compatible with the resin system.
15. A 4.00 g sample from an infused laminate leaves 2.60 g of glass after an ignition-loss test. The process specification calls for 60 to 70% glass by weight. What should be recorded?
Answer: Within specification at 65% glass; record the batch. Glass content is residue divided by original weight: 2.60 / 4.00 = 65%, within the range. The figure of 35% is the resin content lost on ignition, not the glass. Record the result with the batch and process data so that it can be traced to the part, which is the point of closed mold documentation.

Get the full ACMA CCT Vacuum Infusion prep

Most popular · cancel anytime

Premium Monthly

$147/month
per exam
About $4.83 a day · less than an hour of shop time, for the certification customers and insurers look for
  • One ABYC exam of your choice: any of the 10 certifications, from Marine Electrical to USCG Regulations
  • 3,000 practice questions + 6 full mock exams per exam
  • 800 flashcards + 60 key notes per exam, by topic, plus mind maps
  • Spaced repetition + mistakes bank
  • Readiness Score & detailed reports
  • Video lessons as they release
  • Content updates during your access
  • 5 bonuses: numbers and formulas sheet, standards map, study planner and more
  • Pass Guarantee: complete the prep, pass or 100% back

Renews monthly until you cancel. Cancel in two clicks from your account; you keep access until the end of the month you've paid for. No minimum term.

Best value · 3 months free

Premium Yearly

$1,323/year
per exam
Pay for 9 months, get 12. Save $441 against paying monthly.
  • One ABYC exam of your choice: any of the 10 certifications, from Marine Electrical to USCG Regulations
  • 3,000 practice questions + 6 full mock exams per exam
  • 800 flashcards + 60 key notes per exam, by topic, plus mind maps
  • Spaced repetition + mistakes bank
  • Readiness Score & detailed reports
  • Video lessons as they release
  • Content updates during your access
  • 5 bonuses: numbers and formulas sheet, standards map, study planner and more
  • Pass Guarantee: complete the prep, pass or 100% back

Renews once a year until you cancel. We email you before each renewal. Cancel any time from your account; you keep access until the end of the year you've paid for.

Pass Guarantee. Complete the full prep, sit your exam within 60 days, and if you don't pass we refund 100% of your subscription payments. See the requirements
Secure checkout by Stripe Card, Apple Pay, Google Pay Pass Guarantee

ACMA CCT Vacuum Infusion exam FAQ

How many questions are on the ACMA CCT Vacuum Infusion exam?

100 multiple-choice questions, with a time limit of 2 hours; the exam cannot be paused, and unanswered questions count as incorrect. Format: closed book: no study materials, notes or mobile devices. this prep covers the knowledge exam only; hands-on infusion demonstrations are part of optional acma training events.

What is the passing score for ACMA CCT Vacuum Infusion?

80% minimum.

How much does the ACMA CCT Vacuum Infusion exam cost?

US$345 ACMA members, US$475 non-members per the 2026 Candidate Handbook, with two exam attempts. ACMA's Spanish VIP page still lists US$320 and US$443, so confirm at enrollment. Recertification every 3 years is listed at US$65 members, US$120 non-members. ABYC charges members less than nonmembers, so confirm current fees with ABYC before you book.

Which languages is the ACMA CCT Vacuum Infusion exam offered in?

English and Spanish.

Where do I take the ACMA CCT Vacuum Infusion exam?

Online through the ACMA Education Hub, year-round; ACMA's FAQ states that no proctor, proctor code or scheduling is required.

Is this ACMA CCT Vacuum Infusion practice test free?

Yes. The 15-question practice test on this page is free, with an explanation for every answer and no signup. A free account also unlocks the complete study notes for the first topic. The full ACMA CCT Vacuum Infusion prep is Premium at $147 a month for this exam.

What's in the premium ACMA CCT Vacuum Infusion prep?

3,000 practice questions organized topic by topic (General Composites Knowledge: 375; Tooling for VIP and Closed Molding: 375; Understanding Vacuum and Pressure: 375; Resin Flow Theory: 375; Vacuum Bag Configuration and Fabrication: 375; VIP Molding Process: 375; Light RTM and Molded Components: 375; Closed Mold Quality Control: 375), 6 full-length timed mock exams of 100 questions, 800 flashcards and 60 comprehensive key notes split across all 8 topics, plus a mistakes bank and the Readiness Score.

Related practice tests

Composites

ACMA Certified Composites Technician, Open Molding (CCT-OM)

ACMA's credential for technicians working in hand lay-up and spray-up.

15 free questions3,000 premium Qs · 6 mocks · 800 flashcards · 60 key notes
Start free test →

Exam details are summarized from the official candidate information available in November 2026. ABYC changes formats and fees, so confirm with American Composites Manufacturers Association (ACMA) before you book. ABYCExamPrep is not affiliated with the American Boat & Yacht Council.

Start the free test