Cal. Public Resources Code - PRC § 19515. Section 19515.
The quality specifications provided in this chapter are the minimum quality specifications which cullet is required to meet for purposes of the exemption specified in Section 19522.
CHAPTER 3. Cullet Specifications for Fiberglass Manufacturing [19515. - 19519.]
Cal. Public Resources Code - PRC 3.
in effectCal. Public Resources Code - PRC § 19515.5. Section 19515.5.
Chemical Composition
Tolerance
(+ or -
Oxides
Percentage Weight
Percentage Range)
Silicon Dioxide
66-75
1.00
Aluminum Oxide
0-7
0.50
Calcium Oxide
5-15
0.50
Magnesium Oxide
0-5
0.50
Sodium Oxide
8-18
0.50
Potassium Oxide
0-4
0.50
Iron Oxide
less than 0.5
0.05
Chromium Oxide
less than 0.1
0.02
Sulfur Trioxide
less than 0.2
0.02
All other oxides
less than 0.1
0.02
Organic Carbon
less than 0.1
0.02
Moisture Content
less than 0.5
0.05
(No caking with free-flowing fiberglass)
Loss on Ignition
less than 1.0
0.10
Cal. Public Resources Code - PRC § 19516. Section 19516.
Contaminants
Other Inorganic Material
Percentage Weight
+ 12 Mesh
None
+ 20 Mesh
less than 0.1
− 20 Mesh
less than 0.2
Magnetic Materials
less than 0.1
Nonmagnetic Metals
None
Cal. Public Resources Code - PRC § 19517. Section 19517.
Physical Composition
Particle Size: Cullet shall be one of two types below depending upon the requirements of the fiberglass manufacturer.
Screen Size
Coarse Cullet
Fine Cullet
+
¼″
0%
0%
+
12 Mesh
25% Minimum
0.5%
Maximum
–
200 Mesh
15% Maximum
15.0% Maximum
Color Distribution
Tolerance
(+
or
–
Type
Nominal Percentage Weight
Percentage Range)
Flint
0–100
+ or
–
3.0
Green
1–100
+ or
–
3.0
Amber
less than 25
+ or
–
3.0
Cal. Public Resources Code - PRC § 19518. Section 19518.
The department may change minimum quality specifications based upon the fiberglass industries’ ability to use cullet with higher levels of contamination.
Cal. Public Resources Code - PRC § 19519. Section 19519.
A fiberglass manufacturer shall comply with all applicable state and federal laws, regulations, and permits concerning the environment, health, or safety when using cullet in fiberglass manufacturing.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026