Republic of the Philippines
Department of Education
National Capital Region
DIVISION OF CITY SCHOOLS – MANILA
Manila Education Center Arroceros Forest Park
Antonio J. Villegas St. Ermita, Manila
TVL/Industrial Arts
AUTOMOTIVE
SERVICING
Grade 11
1ST Quarter – Module 1 (Week 1)
Apply Appropriate Sealant / Adhesives (AAS)
Most Essential Learning Competency
Identify appropriate sealant/adhesive (CODE: TLE_IAAUTO9 -12AAS-Ia-1)
Prepare surface for sealant/ adhesive application (CODE: TLE_IAAUTO9 -12AAS-Ia-2)
0
HOW DO YOU USE THIS MODULE?
Before starting the module, I want you to set aside other tasks that will
disturb you while enjoying the lessons. Read the simple instructions below to
successfully enjoy the objectives of this kit. Have fun!
1. Follow carefully all the contents and instructions indicated in every page of
this module.
2. Write on your notebook the concepts about the lessons. Writing enhances
learning, that is important to develop and keep in mind.
3. Perform all the provided activities in the module.
4. Let your facilitator/guardian assess your answers using the answer keycard.
5. Analyze conceptually the posttest and apply what you have learned.
6. Enjoy studying!
PARTS OF THE MODULE
•
•
•
•
•
•
•
Expectations - These are what you will be able to know after completing
the lessons in the module.
Pre-test - This will measure your prior knowledge and the concepts to be
mastered throughout the lesson.
Brief Introduction- This section will give you an overview of the lesson.
Activities - This is a set of activities you will perform with a partner.
Remember - This section summarizes the concepts and applications of
the lessons.
Check your Understanding- It will verify how you learned from the
lesson.
Post-test - This will measure how much you have learned from the entire
module.
LESSON 1 – Select sealant/adhesive in line with job requirements
and manufacturer’s specifications
EXPECTATION:
•
•
•
•
Select sealant/adhesive in line with job requirements and manufacturer’s
specifications.
Perform sealant/adhesive checking to ensure the product is fit for use.
Identify the types of sealant and adhesives according to surface.
Clean surface free of moisture, dust, and other foreign matters to ensure
maximum adhesion or seal
1
PRE – TEST
Direction: Read the questions carefully and encircle the letter of
answer.
the correct
1. Referred to as one-part sealants and are supplied “ready for use” as packed?
A. Curing sealant
B. Pliable sealant
C. Drying sealant
D. All of the above
2. Set and cure by evaporation of solvent?
A. Curing sealant
B. Pliable sealant
C. Drying sealant
D. Aerobic sealant
3. Catalyst-cured sealants have an advantage over drying sealants because they
are transformed from fluid or semi-fluid state into solid by chemical reaction
rather than by evaporation of a solvent?
A. Drying sealant
B. Curing sealant
C. Aerobic sealant
D. Pliable sealant
4. Glass, stone, wood and metals are types of _________?
A. Sealants
B. Adhesive
C. Epoxy
D. Surface materials
5. It is used to create an impenetration barrier to gas or moisture?
A. Sealant
B. Adhesive
C. Urethane
D. Epoxy
6. A product which used as bond between two different or similar materials?
A. Sealants
B. Adhesives
C. Urethane
D. Epoxy
7. It is added and mixed just prior to sealant application?
A. Chemical catalyst B. Adhesive
C. Epoxy
D. Urethane
8. Supplies that are known for their hardness and are used with more substances?
A. Epoxies
B. Urethanes
C. Sealants
D. Adhesives
9. Supplies used for flexible materials in high impact applications?
A. Epoxy
B. Urethanes
C. Sealants
D. Adhesive
10. Once the sealant has been applied, the parts must be?
A. Joint
B. Torque
C. Rivets
D. All of the above
2
BRIEF INTRODUCTION
There are various types of engine sealant and adhesives depending on the
part of the engine whey they will serve their purpose. There is sealant that are
resistant to heat and chemicals, while others need special process on how they
have to be used. Thus, correct identification of the sealant is important to every
automobile serviceman.
Topic 1: Identify appropriate sealant/adhesive & Prepare surface for sealant/
adhesive application
Objectives
•
•
•
Select sealant/adhesive in line with job requirements and manufacturer’s
specifications.
Perform sealant/adhesive checking to ensure the product is fit for use.
Follow safety procedures in preparing different surfaces.
LEARNING CONTENT
TYPES OF SEALANTS
The physical conditions surrounding the seal govern the type of sealant to be
used. Some sealants are exposed to extremely high or low temperatures. Other
sealants contact fuels and lubricants. Therefore, it is necessary to use a sealant that
has been compounded for the particular condition. Sealants are supplied in different
consistencies and cure rates. Basic sealants are classified in three general
categories—pliable, drying, and curing.
Pliable Sealants
Pliable sealants are referred to as one-part sealants and are supplied "ready
for use" as packaged. They are solids and change very little during or after
application. Solvent is not used with pliable sealants. Therefore, drying is not
necessary. Except for normal aging, they remain virtually the same as when they
were packaged. They easily adhere to metal, glass, and plastic surfaces. Pliable
sealants are used around access panels and doors and in areas where pressurization
cavities must be maintained.
Drying Sealants
Drying sealants set and cure by evaporation of the solvent. Solvents are used
in these sealants to provide the desired application consistency. Consistency or
hardness may change when this type of sealant dries, depending on the amount of
solvent it contains. Shrinkage during the drying process is an important
consideration. The degree of shrinkage also depends upon the amount of solvent it
contains.
Curing Sealants
3
Catalyst-cured sealants have an advantage over drying sealants because they
are transformed from a fluid or semi-fluid state into solid by chemical reaction rather
than by evaporation of a solvent. A chemical catalyst or accelerator is added and
mixed just prior to sealant application. Heat may be employed to speed up the curing
process. When you use a catalyst, you should accurately measure and thoroughly
mix the two components to ensure a complete and even cure.
Uses of Sealant and Adhesive
The adhesive and sealants include two chemically similar but functionally
different groups of formulated products, adhesive and sealants.
1. Adhesive products are used to bond between two different or similar
materials.
2. Sealants are used to create an impenetration barrier to gas or moisture.
Types of surface materials
Sealants and adhesives are used in different surface materials such as glass,
stone, wood, and metals. The sealant and adhesive used in these types of materials
differs from each other.
The epoxy and polyurethane systems are most often used in the reactive
sector. Urethanes are used with flexible materials in high impact applications, while
epoxies are known for their hardness and are used with more rigid substances.
Activity 1:
What are the three (3) types of sealant
Give the two (2) uses
and give a brief explanation each?
of sealant?
Topic 2: Preparing Surface for sealant and Adhesive
LEARNING CONTENT
Identifying health hazards associate in handling sealant and adhesive
Physical Hardening Adhesives components are primarily polymers and resins.
It is converted into liquid from through heating or dissolving its components before
it can be used. The dried adhesive like this biologically unhazardous.
4
Organic solvents are adhesives that the polymers and resins are liquefied with
the use or biological diluents. The potential hazard in this kind of adhesives is
determined by its flammability, and possible skin irritation problems. And since, this
is a high volatile solvent, the exposure of the body through inhaling vapor is the
utmost concern of the user.
Water based adhesive has no potential health danger to the users. However,
it is very subtle to the outbreak of mold formation that is why extra care must be
observed in using this type of adhesive.
Heat curing adhesives has potential risk of burns to the users.
Anaerobic sealant contains small amount of acid and acrylic monomers which
is hazardous in a prolong contact with the skin especially with open wounds. It is
suggested to use safety gloves and goggles when using this type of sealant.
Proper Storage and disposal of sealant and adhesive.
Storing sealants and adhesive should be in a no smoking areas because of the
fumes emitted by the sealants. All flammable adhesives should be kept in a tight
container and be stored in a cool and dry conditions with a reasonable temperature
between 5 to 30 degrees centigrade. In opening sealed adhesive, containers should
be opened slowly to prevent abrupt release of flammable fumes. Hazards related with
the material properties of adhesives such as combustibility, volatility, likely to
explode and burns and the chemical effects such as poisonous, irritation of the skin,
acid burns and allergies should be avoided.
Hazards like these can be avoided if proper care and correct usage of sealant
and adhesives are observed religiously. Aside from these, the correct workplace
ventilation is also a factor as well as the wearing of personal protective equipment.
Figure 2-Hand Gloves
Figure 3 –face shield
Figure 4-Eye Shield
Activity 1:
Give at least five (5) Harmful effects of sealant and adhesives.
5
CHECK YOUR UNDERSTANDING
REMEMBER
There are three (3) types of sealant, Basic sealants are classified in three
general categories—pliable, drying, and curing. Pliable sealants are referred to as
one-part sealants and are supplied "ready for use" as packaged. Drying sealants
set and cure by evaporation of the solvent. Solvents are used in these sealants to
provide the desired application consistency. Catalyst-cured sealants have an
advantage over drying sealants because they are transformed from a fluid or semifluid state into solid by chemical reaction rather than by evaporation of a solvent.
Physical Hardening Adhesives components are primarily polymers and
resins. Organic solvents are adhesives that the polymers and resins are liquefied
with the use or biological diluents. The potential hazard in this kind of adhesives
is determined by its flammability, and possible skin irritation problems.
Water based adhesive has no potential health danger to the users. Heat
curing adhesives has potential risk of burns to the users. Anaerobic sealant
contains small amount of acid and acrylic monomers which is hazardous in a
prolong contact with the skin especially with open wounds.
Storing sealants and adhesive should be in a no smoking areas because of
the fumes emitted by the sealants.
I. Select the correct answer to each question.
1. Referred to as one-part sealants and are supplied “ready for use” as packed?
A. Curing sealant
B. Pliable sealant
C. Drying sealant
D. All of the above
2. Set and cure by evaporation of solvent?
A. Curing sealant
B. Pliable sealant
C. Drying sealant
D. Aerobic sealant
3. Catalyst-cured sealants have an advantage over drying sealants because they are
transformed from fluid or semi-fluid state into solid by chemical reaction rather
than by evaporation of a solvent?
A. Drying sealant
B. Curing sealant
C. Aerobic sealant
D. Pliable sealant
4. Glass, stone, wood and metals are types of _________?
A. Sealants
B. Adhesive
C. Epoxy
D. Surface material
5. It is used to create an impenetration barrier to gas or moisture?
A. Sealant
B. Adhesive
C. Urethane D. Epoxy
II. Read the statement carefully and fill in the blanks with the correct answer.
1. To remove the excess sealant and adhesive use _____________.
2. After removing the excess sealant and adhesive wipe the surface with clean rag
and ___________________.
3. Sealant and adhesive must be stored in ______________________.
4 – 5. Sealant industry has expressed a desire to move away from the use of primer
adhesive system because of its __________ and _________.
6
POST – TEST
Direction: Read the questions carefully and encircle the letter of
answer.
the correct
1. Referred to as one-part sealants and are supplied “ready for use” as packed?
A. Curing sealant
C. Drying sealant
B. Pliable sealant
D. All of the above
2. Set and cure by evaporation of solvent?
A. Curing sealant
B. Pliable sealant
C. Drying sealant
D. Aerobic sealant
3. Catalyst-cured sealants have an advantage over drying sealants because they are
transformed from fluid or semi-fluid state into solid by chemical reaction rather
than by evaporation of a solvent?
A. Drying sealant
B. Curing sealant
C. Aerobic sealant
D. Pliable sealant
4. Glass, stone, wood and metals are types of _________?
A. Sealants
B. Adhesive C. Epoxy
D. Surface materials
5. It is used to create an impenetration barrier to gas or moisture?
A. Sealant
B. Adhesive
C. Urethane
D. Epoxy
6. A product which used as bond between two different or similar materials?
A. Sealants
B. Adhesives
C. Urethane
D. Epoxy
7. It is added and mixed just prior to sealant application?
A. Chemical catalyst B. Adhesive
C. Epoxy
D. Urethane
8 Supplies that are known for their hardness and are used with more substances?
A. Epoxies
B. Urethanes
C. Sealants D. Adhesives
9. Supplies used for flexible materials in high impact applications?
A. Epoxy
B. Urethanes
C. Sealants D. Adhesive
10 Once the sealant has been applied, the parts must be?
A. Joint
B. Torque
C. Rivets
D. All of the above
7
KEY TO CORRECT
Pretest and Post test
1. b
2. c
3. b
4. d
5. a
6. b
7. a
8. a
9. b
10. d
REFERENCE:
• STVEP CBLM Second Year Automotive Servicing NCI
Acknowledgements
Writer: Luisito S. Terrago,
Editor: Ariel D. Tosio EPS
Reviewer: Roberto Daquil HT-VI, Sabas Baccay HT-VI, Willy Llagas III
Management Team: Maria Magdalena M. Lim-Schools Division
Superintendent-Manila, Aida H. Rondilla-Chief Education Supervisor
Lucky S. Carpio-EPS and Lady Hannah C Gillo, Librarian II-LRMS
8
9